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Multi_340i
Contenu du document
ba52318e02 03/2004
Multi 340i
Operating manual
AR
RCL ST
O C
A
L
M
O
6
7 1
9
2 7
O
°C
m
g/l
ARng TP
pH/Dissolved Oxygen/Conductivity
Measuring Instrument
Accuracy when
going to pressThe use of advanced technology and the high quality standard of our
instruments are the result of continuous development. This may result
in differences between this operating manual and your instrument. Al-
so, we cannot guarantee that there are absolutely no errors in this man-
ual. Therefore, we are sure you will understand that we cannot accept
any legal claims resulting from the data, figures or descriptions.
WarrantyWe guarantee the instrument described for 3 years from the date of
purchase.
The instrument warranty covers manufacturing faults that are discov-
ered within the warranty period. The warranty does not cover compo-
nents that are replaced during maintenance work, e. g. batteries.
The warranty claim extends to restoring the instrument to readiness for
use but not, however, to any further claim for damages. Improper han-
dling or unauthorized opening of the instrument invalidates any warran-
ty claim.
To ascertain the warranty liability, return the instrument and proof of
purchase together with the date of purchase freight paid or prepaid.
Copyright
© Weilheim 2004, WTW GmbH
Reproduction in whole - or even in part - is prohibited without the ex-
press written permission of WTW GmbH, Weilheim.
Printed in Germany.
Multi 340iList of contents
3
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 SETs of equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.5 Jack field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.6 Operating structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 12
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Switching on the measuring instrument . . . . . . . . . . . . . 15
4.2 pH value / ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . 16
4.2.2 Measuring the pH value . . . . . . . . . . . . . . . . . . 18
4.2.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 19
4.2.4 pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3 Dissolved oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.3.1 General information . . . . . . . . . . . . . . . . . . . . . . 26
4.3.2 Measuring the D. O. concentration . . . . . . . . . . 27
4.3.3 Measuring the D. O. saturation . . . . . . . . . . . . . 28
4.3.4 AutoRead AR (Drift control) . . . . . . . . . . . . . . . 29
4.3.5 D. O. calibration . . . . . . . . . . . . . . . . . . . . . . . . 30
4.3.6 Salt content correction . . . . . . . . . . . . . . . . . . . 33
4.4 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4.1 General information . . . . . . . . . . . . . . . . . . . . . . 34
4.4.2 Measuring the conductivity . . . . . . . . . . . . . . . . 36
4.4.3 Measuring the salinity . . . . . . . . . . . . . . . . . . . . 36
4.4.4 AutoRead AR (Drift control) . . . . . . . . . . . . . . . 37
4.4.5 Determining the cell constant (Calibration in the
control standard) . . . . . . . . . . . . . . . . . . . . . . . . 38
4.5 Calibration intervals (Int 3, Int 4, Int 5) . . . . . . . . . . . . . . 41
4.6 Saving data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.6.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 42
4.6.2 Switching on AutoStore (Int 1) . . . . . . . . . . . . . 44
4.6.3 Outputting the data storage . . . . . . . . . . . . . . . . 46
4.6.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 52
4.7 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.7.1 Data transmission interval (Int 2) . . . . . . . . . . . 53
List of contentsMulti 340i
4
4.7.2 PC/external printer (RS 232 interface) . . . . . . . . 55
4.7.3 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.8 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
4.9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 63
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.1 pH system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.2 Oxi system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
6.3 Conductivity system messages . . . . . . . . . . . . . . . . . . . 68
6.4 General errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Multi 340iOverview
5
1Overview
1.1 General features
The compact precision handheld meter Multi 340i enables you to carry
out pH measurements, dissolved oxygen (D. O.) measurements and
conductivity measurements quickly and reliably.
The Multi 340i handheld meter provides the maximum degree of oper-
ating comfort, reliability and measuring certainty for all applications.
The proven MultiCal
® and OxiCal ® calibration procedures and the pro-
cedures to determine/set up the cell constant support you in your work
with the meter. The special AutoRead function enables precise mea-
surements.
Note
If you need further information or application notes, you can obtain the
following material from WTW:
Application reports
Primers
Safety datasheets.
You will find information on available literature in the WTW catalog or
via the Internet. 1Keypad
2Display
3Jack field
AR
RCL ST
O C
AL
M
O
6
7 1
9
2 7
O
°C
m
g/l
ARng TP
1 2 3
OverviewMulti 340i
6
1.2 SETs of equipment
The measuring instrument is also available as part of individual SETs
of equipment.
You will find additional information on this and other accessories in the
WTW catalog or via the Internet.
Set (sample configuration):
1Multi 340i meter, carrying strap with 2 carrying clips, armoring
2Cond/Oxi beaker with beaker clip
3pH beaker
4Stand
5Plastic beaker
6Storing solution for pH electrodes
1
2 45 11 109 1213 141516
17
18
19
8
7
6
5
4
3
Multi 340iOverview
7
750 ml pH buffer solution, STP 4
850 ml pH buffer solution, STP 7
9Calibration and control standard for conductivity measuring
cells, 50 ml
1050 ml ELY/G electrolyte solution for D.O. probes
1150 ml RL/G cleaning solution for D.O. probes
12WP 90/3 exchange membrane heads for D. O. probes
(3 pieces)
13SF 300 abrasive film for D.O. probes
14Conductivity measuring cell
–TetraCon® 325-3 or
–TetraCon® 325
15pH electrode
–SenTix 41-3 or
–SenTix 41
16Oxygen sensor
–CellOx 325-3 or
–CellOx 325
17Operating manual + short operating manual
18Equipment case
19Plug-in power supply unit
OverviewMulti 340i
8
1.3 Keypad
Key functions
RUN/ENTERAR RCL CALSTO M
Select the measured variable :
–pH value / ORP voltage
–D. O. concentration / D. O. saturation
–Conductivity / salinity
Save a measured value
Switch measuring instrument on/off
Calibrate the currently set measured variable
Display/transmit measured values
Activate/deactivate the AutoRead function
Select the measuring mode, increase values,
scroll
< >
Select the measuring mode, decrease values,
scroll
<>
Confirm entries, start AutoRead,
output measured values
M
STO
CAL
RCL
AR
RUN/ENTER
Multi 340iOverview
9
1.4 Display
1.5 Jack field
1D. O. probe or conductivity measuring cell
2pH electrode
3pH temperature sensor
4Plug-in power supply unit
5RS232 serial interface
ARng
Tref20 AutoCal DIN
Lin
TDS
cm M
°F /K %
Time Baud Day.Month No.Ident Year 8
8.8
8
8 8
°C
% mg/l
TP
1
mV/pH
UpH Sal O
S
Tref25
nLF AutoCal TEC RCL
Auto Store
LoBat Cal AR
1/cm Sal
mbar
S/ m cm
Status display
Meas. value display
Function and
temperature displaySensor symbol
5
1234
OverviewMulti 340i
10
1.6 Operating structure
The following overview diagram shows which keys you have to press
to select between the different measuring modes:
Note
When a D. O. probe or a conductivity measuring cell with a temperature
probe is connected, the measuring instrument recognizes the probe or
measuring cell and automatically switches to the oxygen measuring
mode or conductivity measuring mode last selected. As soon as the
probe/measuring cell is disconnected, the instrument switches to the
pH or ORP measuring mode.
Multi 340iSafety
11
2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the measur-
ing instrument. Consequently, all responsible personnel must read this
operating manual carefully before working with the measuring system.
The operating manual must always be available within the vicinity of the
measuring system.
Target groupThe measuring instrument was developed for work in the field and in
the laboratory.
Thus, we assume that, as a result of their professional training and ex-
perience, the operators will know the necessary safety precautions to
take when handling chemicals.
Safety instructionsThe individual chapters of this operating manual use the following safe-
ty instruction to indicate various types of danger:
Warning
indicates instructions that must be followed precisely in order to avoid
the possibility of slight injuries or damage to the instrument or the envi-
ronment.
Further notes
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating manu-
als.
2.1 Authorized use
The authorized use of the measuring instrument consists exclusively of
the:
pH and ORP measurement
measurement of the oxygen content and
measurement of the conductivity, salinity and temperature
in the field and laboratory.
The technical specifications as given in chapter 7 T
ECHNICAL DATA must
be observed. Only the operation and running of the measuring instru-
ment according to the instructions given in this operating manual is au-
thorized. Any other use is considered to be unauthorized.
SafetyMulti 340i
12
2.2 General safety instructions
This instrument is built and inspected according to the relevant guide-
lines and norms for electronic measuring instruments (see chapter 7
T
ECHNICAL DATA ).
It left the factory in a safe and secure technical condition.
Function and operating
safetyThe smooth functioning and operational safety of the measuring instru-
ment can only be guaranteed if the generally applicable safety mea-
sures and the specific safety instructions in this operating manual are
followed during operation.
The smooth functioning and operational safety of the measuring instru-
ment can only be guaranteed under the environmental conditions that
are in specified in chapter 7 T
ECHNICAL DATA .
If the instrument was transported from a cold environment to a warm
environment, the formation of condensate can lead to the faulty func-
tioning of the instrument. In this event, wait until the temperature of the
instrument reaches room temperature before putting the instrument
back into operation.
Safe operationIf safe operation is no longer possible, the instrument must be taken out
of service and secured against inadvertent operation!
Safe operation is no longer possible if the measuring instrument:
has been damaged in transport
has been stored under adverse conditions for a lengthy period of
time
is visibly damaged
no longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the instrument.
Obligations of the pur-
chaserThe purchaser of the measuring instrument must ensure that the fol-
lowing laws and guidelines are observed when using dangerous sub-
stances:
EEC directives for protective labor legislation
National protective labor legislation
Safety regulations
Safety datasheets of the chemical manufacturers.
Multi 340iCommissioning
13
3 Commissioning
3.1 Scope of delivery
Multi 340i handheld meter
Plug-in power supply unit
Operating manual and short operating manual
4 batteries, 1.5 V Mignon type AA (in the instrument)
For details of scope of delivery of SETs, see section 1.2 SET
S OF
EQUIPMENT and WTW catalog.
3.2 Initial commissioning
Perform the following activities:
Set the date and time
Connect the plug-in power supply (optional)
Setting the date and
time
1 Press the key and hold it down.
2 Press the key.
The display test appears briefly on the display.
3 Press the key repeatedly until the date ap-
pears on the display.
4 Set the date of the current day with <> <>.
5 Confirm with .
The date (month) flashes in the display.
6 Set the current month with <> <>.
7 Confirm with .
The year appears on the display.
8 Set the current year with <> <>.
9 Confirm with .
The hours flash on the display.
10 Set the current time with <> <>.
11 Confirm with .
The minutes flash on the display.
12 Set the current time with <> <>.
CommissioningMulti 340i
14
Connecting the
plug-in power supplyYou can either operate the measuring instrument with batteries or with
the plug-in power supply. The plug-in power supply supplies the mea-
suring instrument with low voltage (12 VDC). This saves the batteries.
Warning
The line voltage at the operating site must lie within the input voltage
range of the original plug-in power supply (see chapter 7 T
ECHNICAL DA -
TA ).
Warning
Use original plug-in power supplies only (see
chapter 7 T
ECHNICAL DATA ).
13 Confirm with .
The instrument switches to a measuring mode.
14 Switch the instrument off using .
1 Plug the jack (1) into the socket (2) of the measuring instru-
ment.
2 Connect the original WTW plug-in power supply (3) to an easily
accessible mains socket.
2
1
3
Multi 340iOperation
15
4 Operation
4.1 Switching on the measuring instrument
Measuring mode when
switching on
Note
The measuring instrument has an energy saving feature to avoid un-
necessary battery depletion. The energy saving feature switches the
measuring instrument off if no key has been pressed for an hour.
The energy saving feature is not active
if the power is supplied by the plug-in power supply,
if the AutoStore function is active,
if the communication cable and a PC with a running communication
program are connected,
if the printer cable is connected (for external printers).
AutoRange measure-
ment range selectionThere are several measuring ranges available for both oxygen and
conductivity measurements. As a rule, the measuring instrument is in
the measuring range with the highest possible resolution. If a measur-
ing range is exceeded, AutoRange causes the measuring instrument to
change automatically to the next higher measuring range.
The AutoRange function is always active with oxygen and conductivity
measurements and cannot be switched off.
Note
The measuring ranges for oxygen and conductivity measurements can
be found in chapter 7 T
ECHNICAL DATA .
1 Press the key.
The display test appears briefly on the display.
After this, the measuring instrument automatically switches to
the measuring mode.
Connected sensor Measuring mode
No sensor or pH/ORP electrode pH or ORP measurement (de-
pending on the last selected set-
ting)
D. O. probe or conductivity mea-
suring cellLast selected measuring mode
2 sensors of any type Last selected measuring mode
OperationMulti 340i
16
4.2 pH value / ORP voltage
4.2.1 General information
Preparatory activitiesPerform the following preparatory activities when you want to measure:
Note
Incorrect calibration of pH electrodes leads to incorrect measured val-
ues. Calibrate regularly before measuring. You can only connect elec-
trodes of the NTC 30 type or without temperature sensor.
Warning
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result. The RS232
interface is not galvanically isolated.
1 Connect the pH electrode to the measuring instrument.
If necessary, press the key repeatedly until the status dis-
play pH (pH measurement) or U (measurement of the ORP
voltage) appears.
2 Adjust the temperature of the buffer solutions or test solutions,
or measure the current temperature, if you measure without a
temperature sensor.
3 Calibrate or check the measuring instrument with the elec-
trode.
4Using <> <>, toggle between the pH or mV measuring
modes.
Multi 340iOperation
17
Temperature measure-
ment in pH measure-
mentsYou can perform pH measurements with or without a temperature sen-
sor as well as with the temperature sensor of an oxygen sensor or a
conductivity measuring cell. The measuring instrument recognizes
which sensors are connected and switches automatically to the correct
mode for the temperature measurement.
The following cases are distinguishable.
* If you do not wish that, you can:
–either disconnect the 2nd sensor and use the manual temperature
input or
–use an electrode with a temperature sensor.
If a temperature sensor is connected, it is indicated on the display by
TP.
Note
When calibrating without a temperature sensor (no TP display indicator
displayed), enter the current temperature of the respective buffer solu-
tion manually using the <> <> keys while keeping the key depressed. Temperature sensor Display Mode
pH Cond or
Oxi
yes -TPAutomatic with
pH temperature sensor
yes yesTP
- - Manual
-yesTP
flashesThe temperature value of the
second probe (Cond or Oxi) in
the same sample is taken
over for the pH measurement*
OperationMulti 340i
18
4.2.2 Measuring the pH value
AutoRead AR
(Drift control)The AutoRead function (drift control) checks the stability of the mea-
surement signal. The stability has a considerable impact on the repro-
ducibility of the measured values.
For identical measurement conditions, the following criteria apply:
1 Perform the preparatory activities according to section 4.2.1.
2 Immerse the pH electrode in the test sample.
3 Press the <> <> keys until pH appears in the status display.
The pH value appears on the display.
4 When measuring without a connected temperature sensor:
Options:
Determine the current temperature using a thermometer
and, while keeping the key depressed, en-
ter this temperature value with <> <>.
TP display indicator not displayed, socket for the second
probe is free:
Connect the second probe (Oxi or Cond) and immerse it in
the same sample. TP flashes, the temperature is automati-
cally measured using the second probe.
Tref20
Lin Cal
8
1
S
Sal O U
% mg/l mV/pH
1/cm Sal
AutoCal DIN Tref25
nLF AutoCal TEC RCL
Auto Store
LoBat ARng AR
Time Baud Day.Month No.Ident Year
mbar
TDS
cm M
°F /K %
S/ m cm
8
4 2
9
9 6
°C TP
pH
Reproducibility Response time
Better than 0.02 > 30 seconds
1 Call up the pH measuring mode with <> <>.
2 Activate the AutoRead function with .
The current measured value is frozen (hold function).
Multi 340iOperation
19
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing .
4.2.3 Measuring the ORP voltage
In conjunction with an ORP electrode, e. g. SenTix ORP, the measuring
instrument can measure the ORP voltage (U) of a solution.
Note
ORP electrodes are not calibrated. However, you can check ORP elec-
trodes using a test solution.
3 Start AutoRead with .
AR flashes until a stable measured value is reached.
This measured value is transmitted to the interface.
4 If necessary, start the next AutoRead measurement with
.
5 To terminate the AutoRead function: Press the key.
1 Perform the preparatory activities according to section 4.2.1.
2 Submerse the Redox electrode in the sample.
3 Press the <> <> keys until the U status display appears.
The ORP voltage (mV) of the sample appears on the display.
4 Wait for a stable measured value.
/pH
Tref20
Cal
8
TDS
S
8
1
pH Sal O
% mg/l
1/cm Sal
AutoCal DIN
Lin
Tref25
nLF AutoCal TEC RCL
Auto Store
LoBat ARng AR
Time Baud Day.Month No.Ident Year
mbar cm M
°F /K %
S/ m cm
8
4 2
2
3
°C TP
U
mV
OperationMulti 340i
20
4.2.4 pH calibration
Why calibrate?pH electrodes age. This changes the asymmetry (zero point) and slope
of the pH electrode. As a result, an inexact measured value is dis-
played. Calibration determines the current values of the asymmetry
and slope of the electrode and stores them in the measuring instru-
ment. Thus, you should calibrate at regular intervals.
When to calibrate?
After connecting another electrode
When the sensor symbol flashes:
–after the calibration interval has expired
–after a voltage interruption, e. g. after changing the batteries
AutoCal TECis specially matched to the WTW technical buffer solutions as a fully au-
tomatic two-point calibration. The buffer solutions are automatically
recognized by the measuring instrument. Depending on the instrument
setting (see section 4.8 C
ONFIGURATION ), the instrument displays the
relevant buffer nominal value or the current electrode voltage in mV.
The calibration can be terminated after the first buffer solution. This cor-
responds to a single-point calibration. To do this, the instrument uses
the Nernst slope (-59.2 mV/pH at 25°C) and determines the asymme-
try of the electrode.
AutoReadThe calibration procedure automatically activates the AutoRead func-
tion.
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing .
Displaying the calibra-
tion dataYou can view the data of the last calibration on the display. The pro-
ceeding is described on page 48.
Printing the
calibration protocolThe calibration record contains the calibration data of the current cali-
bration. You can transmit the calibration protocol to a printer via the se-
rial interface (see O
UTPUTTING THE CALIBRATION PROTOCOL ON THE
INTERFACE , page 51).
Note
You can automatically print a calibration record after the calibration. To
do so, connect a printer to the interface according to section 4.7.2 be-
fore calibrating. After a valid calibration, the record is printed.
Multi 340iOperation
21
Sample printout:
Calibration evaluationAfter calibrating, the measuring instrument automatically evaluates the
calibration. The asymmetry and slope are evaluated separately. The
worst evaluation appears on the display.
CALIBRATION PROTOCOL
02.03.01 14:19
Device No.: 12345678
Calibration pH
Cal time: 01.03.01 / 15:20
Cal interval: 7d
AutoCal TEC Tauto
Buffer 1 2.00
Buffer 2 4.01
Buffer 3 7.00 *
Buffer 4 10.00
C1 184.1 mV 25.0°C
C2 3.0 mV 25.0°C
S1 -59.4 mV/pH
ASY1 - 4 mV
Probe: +++
Display Asymmetry
[mV]Slope
[mV/pH]
- 15 ... + 15 -60.5 ... -58
- 20 ... + 20 -58 ... -57
- 25 ... + 25 -61 ... -60.5
or
-57 ... -56
Clean the electrode according
to the electrode operating
manual- 30 ... + 30 -62 ... -61
or
-56 ... -50
E3
Eliminate the error according to
chapter 6 W
HAT TO DO IF... < - 30 or
> 30... -62 or
... -50
OperationMulti 340i
22
Preparatory activities
AutoCal TECFor this procedure, use any two WTW technical buffer solutions (pH
values at 25°C: 2.00 / 4.01 / 7.00 / 10.01).
Note
The calibration for pH 10.01 is optimized for the WTW technical buffer
solution TEP 10 Trace or TPL 10 Trace. Other buffer solutions can lead
to an erroneous calibration. The correct buffer solutions are given in the
WTW catalog or in the Internet.
Note
The buffer solutions are automatically recognized by the measuring in-
strument. Depending on the instrument setting (see section
4.8 C
ONFIGURATION ), the instrument displays the relevant buffer nomi-
nal value or the current electrode voltage in mV.
Note
Skip the steps 2 and 7 if you use a pH electrode with temperature sen-
sor or the temperature sensor of a conductivity measuring cell or a D.
O. probe.
Starting the calibration
1 Connect the pH electrode to the measuring instrument.
If necessary, press the key repeatedly until the status dis-
play pH (pH measurement) or U (measurement of the ORP
voltage) appears.
2 Keep the buffer solutions ready.
3 Adjust the temperature of the solution and measure the current
temperature if the measurement is made without the use of a
temperature sensor (the TP display indicator is missing from
the display).
1 Press the key. The Ct1 display and the function display
AutoCal TEC appears. The sensor symbol displays the evalu-
ation of the last calibration (or no sensor symbol in the delivery
state or after the measurement parameter has been reset).
Multi 340iOperation
23
Note
At this point, the AutoCal TEC calibration can be terminated with .
This corresponds to a single-point calibration. To do this, the instru-
ment uses the Nernst slope (-59.2 mV/pH at 25°C) and determines the
asymmetry of the electrode.
2 If required, enter the temperature of the first buffer solution,
while keeping the key depressed, using <>
<>.
3 Immerse the pH electrode in the first buffer solution.
4 Press the key.
The AR display indicator flashes.
The electrode voltage (mV) or the buffer nominal value ap-
pears on the display. Example:
5 When the measured value is stable, Ct2 appears.
/pH
mV
TDS O U
Tref20
Cal
8
S
1
Sal
% mg/l
1/cm Sal
AutoCal DIN
Lin
Tref25
nLF RCL
Auto Store
LoBat ARng AR
Time Baud Day.Month No.Ident Year
mbar cm M
°F /K %
S/ m cm
8
4 2
t
1
°C TP
pH
C
AutoCal TEC
cm 3 7
°F 0
Cal
Tref20
Lin
0
Cal
Tref25
ARng
AutoCal DIN Tref25 Auto AutoCal DIN
ARng
Tref20
Lin
F
cm1/ 1/ cm
AR AR
RCL RCL
O O UpH UpH Sal Sal
Store Store Auto
LoBat LoBat nLF nLF
Sal Sal
% % mg/l mg/l mV/pH mV/pH
cm
°
m mS/ S/ cm cm
% %/ /K K
M M
TDS TDS
1 1
S S
mbar mbar
Time Baud Day.Month No.Ident Year
Time Baud Day.Month No.Ident Year
0
0 37
pH pH
C °C °
AutoCal TEC AutoCal TEC AR AR
mV
88
44 22 TP TP
/pH
mV
TDS O U
Tref20
Cal
8
S
1
Sal
% mg/l
1/cm Sal
AutoCal DIN
Lin
Tref25
nLF RCL
Auto Store
LoBat ARng AR
Time Baud Day.Month No.Ident Year
mbar cm M
°F /K %
S/ m cm
8
4 2
t
2
°C TP
pH
C
AutoCal TEC
OperationMulti 340i
24
6 Thoroughly rinse the electrode with distilled water.
7 If required, enter the temperature of the first buffer solution,
while keeping the key depressed, using <>
<>.
8 Immerse the pH electrode in the second buffer solution.
9 Press the key.
The AR display indicator flashes.
The electrode voltage (mV) or the buffer nominal value ap-
pears on the display. Example:
10 When the measured value is stable, AR disappears. The value
of the slope (mV/pH) appears on the display. The probe symbol
shows the evaluation of the current calibration.
11 Press the key. The value of the asymmetry
(mV) appears on the display.
1
TDS
S
°F 0
Cal
Tref20
Lin
0
Cal
Tref25
ARng
AutoCal DIN Tref25 Auto AutoCal DIN
ARng
Tref20
Lin
F
cm1/ 1/ cm
AR AR
RCL RCL
O O UpH UpH Sal Sal
Store Store Auto
LoBat LoBat nLF nLF
Sal Sal
% % mg/l mg/l mV/pH mV/pH
cm cm
°
m mS/ S/ cm cm
% %/ /K K
M M
TDS
1
S
mbar mbar
Time Baud Day.Month No.Ident Year
Time Baud Day.Month No.Ident Year 88
44
0 8
1 44
pH pH
C °C °
AutoCal TEC AutoCal TEC AR AR
mV
1
22 TP TP
O
L S
RCL
Sal
cm
AutoCal DIN
Day.Month
S
Tref20
Cal
IdentNo. Year
Time Baud 1
TDS Sal
Store
AR
Tref25
cm
C /% KTP °
M mbar
1/
%
m
mg/l
cm S/
Lin
O U
nLF
Auto
LoBat ARng
°F
9
4
pH
5
mV/pH
AutoCal TEC
Multi 340iOperation
25
12 Switch to the measuring mode with .
Y A
S
0
RCL
Sal
cm
AutoCal DIN
TimeDay.Month
Sal
Store
AR
8
No.Ident
Tref20 Tref25
Year
Baud cm
C /% KTP °
M mbar
1/
%
m
mg/l
cm S/
TDS
6
Lin Cal
1
S
O U
nLF
Auto
LoBat ARng
°F
2
pH
mV
AutoCal TEC
OperationMulti 340i
26
4.3 Dissolved oxygen
4.3.1 General information
Note
D. O. measurements with the Multi 340i can only be carried out using
a CellOx 325 or StirrOx G D. O. probe. The stirrer of the StirrOx G
D. O. probe has to be supplied with voltage separately using the
NT/pH Mix 540 power supply.
You can measure the following variables:
D. O. concentration
D. O. saturation
The measuring instrument is supplied with the following functions:
AutoRange (automatic switchover of the measurement range),
The AutoRead function (drift control) for checking the stability of the
measurement signal. This ensures the reproducibility of the measur-
ing signal. For details of how to switch the AutoRead function on/off,
see page 29.
Warning
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result.
The RS 232 interface is not galvanically isolated.
Preparatory activitiesPerform the following preparatory activities when you want to measure:
Note
Incorrect calibration of D. O. probes will result in incorrect
measured values. Calibrate at regular intervals.
Temperature sensorThe D. O. probe has an integrated temperature sensor that always
measures the current temperature of the test sample.
1 Connect the D. O. probe to the measuring instrument. The in-
strument automatically switches over to D. O. measurement
(O
2 status display).
If the D. O. probe is already connected, press the repeat-
edly until the O
2 status display appears.
2 Calibrate or check the measuring instrument with the sensor.
How to calibrate is described in section 4.3.5 from page 20.
3 Use <> <> to toggle between the measuring modes, D. O.
concentration (mg/L) and D. O. saturation (%).
Multi 340iOperation
27
4.3.2 Measuring the D. O. concentration
When measuring the concentration of test samples with a salt content
of more than 1 g/l, a salinity correction is required.
Note
How to enter the current salt content is described in section 4.3.6 S
ALT
CONTENT CORRECTION on page 33.
Switching the salt content correction on or off, see below.
To measure the D. O. concentration with and without salt content cor-
rection, proceed as follows:
Switching on/off the salt
content correctionProceed as follows to switch on the salt content correction:
1 Perform the preparatory activities according to section 4.3.1.
2 Immerse the D. O. probe in the test sample.
3 Press the <> <> key repeatedly until the D. O. concentra-
tion in mg/l appears on the display.
RCL
cm
cm
M
m S/
% /pH
mV
pH
U TDS
Tref20
Cal
8
S
1
Sal
1/cm Sal
AutoCal DIN
Lin
Tref25
nLF AutoCal TEC
Auto Store
LoBat AR
Time Baud Day.Month No.Ident Year
mbar
°F /K % 6
7 1
9
2
°C TP
7
O
mg/l
ARng
1 Perform the preparatory activities according to section 4.3.1.
2 Immerse the D. O. probe in the test sample.
3 While pressing the key, switch on the salt con-
tent correction with <> . The SAL display indicator appears
on the display. The specified salt content is taken into consid-
eration during the measurement.
OperationMulti 340i
28
4.3.3 Measuring the D. O. saturation
You can measure the D. O. saturation as follows:
4 While pressing the key, switch off the salt con-
tent correction with <>. The SAL display indicator is no longer
displayed.
1 Perform the preparatory activities according to section 4.3.1.
2 Immerse the D. O. probe in the test sample.
3 Press the <> <> key repeatedly until the D. O. saturation in
% appears on the display.
cm M
cm
8
LoBat
Time Baud Day.Month No.Ident Year
%
mbar 1
S
RCL AR
Store Auto
Cal
°F
1/
/
K %
TDS UpH Sal
mV/pH
S/ m cm
Lin
Tref25 Tref20
nLF
AutoCal DIN
AutoCal TEC
6
7 1
4
2 5
O
°C
mg/l
TP
Sal
ARng
Auto
Sal
mg/l
cm M
cm
8
LoBat
Time Baud Day.Month No.Ident Year
mbar 1
S
RCL AR
Store
Cal
°F
1/
/
K %
TDS UpH Sal
mV/pH
S/ m cm
Lin
Tref25 Tref20
nLF
AutoCal DIN
AutoCal TEC
6
7 1
9
2 8
O
°C TP
%
ARng
Multi 340iOperation
29
4.3.4 AutoRead AR (Drift control)
The AutoRead function (drift control) checks the stability of the mea-
surement signal. The stability has a considerable impact on the repro-
ducibility of the measured values.
CriteriaWith identical measurement conditions, the following applies:
1 Call up the measuring mode with and/or <> <> .
2 Activate the AutoRead function with . The current mea-
sured value is frozen (hold function).
3 Start AutoRead with .
AR flashes until a stable measured value is reached. This mea-
sured value is transmitted to the interface.
4 If necessary, start the next AutoRead measurement with
.
5 To terminate the AutoRead function: Press the key.
8
LoBat
Time Baud Day.Month No.Ident Year
Sal
%
mbar 1
S
RCL
Store Auto
Cal
°F
1/cm
/K %
TDS UpH Sal
mV/pH
S/ m cm
cm M
Lin
Tref25 Tref20
nLF
AutoCal DIN
AutoCal TEC
6
7 1
0
8
O
°C
mg/l
TP
ARng AR
7
Measuring mode Reproducibility Response time
D. O. concentra-
tionBetter than 0.05 mg/l > 10 seconds
D. O. saturation in-
dexBetter than 0.6 % > 10 seconds
OperationMulti 340i
30
4.3.5 D. O. calibration
Why calibrate?D. O. probes age. This changes the slope of the D. O. probe. Calibra-
tion determines the current slope of the probe and stores this value in
the instrument.
When to calibrate?
After connecting another D. O. probe
When the probe symbol flashes (after the calibration interval has ex-
pired).
Calibration procedureThe calibration is performed in water vapor-saturated air. Use the
OxiCal
®-SL air calibration vessel (accessories) for the calibration.
AutoReadThe calibration procedure automatically activates the AutoRead func-
tion. The AR display indicator flashes. The calibration process is fin-
ished when AR stops flashing.
Displaying the calibra-
tion dataYou can view the data of the last calibration on the display. The pro-
ceeding is described on page 48.
Printing the
calibration protocolThe calibration record contains the calibration data of the current cali-
bration. You can transmit the calibration protocol to a printer via the se-
rial interface (see page 51).
Note
You can automatically print a calibration record after the calibration. To
do so, connect a printer to the interface according to section 4.7.2 be-
fore calibrating. After a valid calibration, the record is printed.
Sample printout:
CALIBRATION PROTOCOL
02.03.01 14:19
Device No.: 12345678
CALIBRATION 02
Cal time: 02.03.01 / 14:19
Cal interval: 14d
OxiCal Tauto AR
Relative Slope: 0,88
Probe: +++
Multi 340iOperation
31
Probe evaluationAfter the calibration, the measuring instrument evaluates the current
status of the probe against the relative slope. The evaluation appears
on the display. The relative slope has no effect on the measuring accu-
racy. Low values indicate that the electrolyte will soon be depleted and
the probe will have to be regenerated.
Starting the calibrationProceed as follows to calibrate the instrument:
Note
The sponge in the air calibration vessel must be moist (not wet). Follow
the instructions in the OxiCal
®-SL operating manual. Display Relative slope
S = 0.8 ... 1.25
S = 0.7 ... 0.8
S = 0.6 ... 0.7
E3
Eliminate the error according to
chapter 6 W
HAT TO DO IF... S < 0.6 or S > 1.25
1 Perform the preparatory activities according to section 4.3.1.
2 Keep the OxiCal
®-SL air calibration vessel ready.
3 Put the D. O. probe into the air calibration vessel.
4 Press the key repeatedly until the calibration mode ap-
pears. The sensor symbol displays the evaluation of the last
calibration (or no sensor symbol in the delivery state or after the
measurement parameter has been reset).
OperationMulti 340i
32
Note
In chapter 6 W
HAT TO DO IF... page 65, you will find the measures to
take for error elimination.
5 Press the key. AutoRead is active, AR flashes.
6 As soon as a stable value is reached, the AR display indicator
stops flashing. The calibration is finished now. The value of the
relative slope appears on the display. The probe symbol shows
the probe evaluation (see page 31).
7 Switch to the measuring mode with .
%
Auto
ARng
Sal
mg/l
cm M
cm
8
LoBat
Time Baud Day.Month No.Ident Year
mbar 1
S
RCL AR
Store
°F
1/
/
K %
TDS UpH Sal
mV/pH
S/ m cm
Lin
Tref25 Tref20
nLF
AutoCal DIN
AutoCal TEC
6
7 1
A
L C
O
°C TP
Cal
mg/l
8
LoBat
Time Baud Day.Month No.Ident Year
Sal
%
mbar 1
1/cm
TDS UpH Sal
mV/pH
S/ m cm
cm M
Lin
Tref25 Tref20
nLF
AutoCal DIN
AutoCal TEC
6
7 1
8
8 0
O
Cal AR
S
ARng
mg/l
8
LoBat
Time Baud Day.Month No.Ident Year
Sal
%
mbar 1
RCL
Store Auto
°F
1/cm
/K %
TDS UpH Sal
mV/pH
S/ m cm
cm M
Lin
Tref25 Tref20
nLF
AutoCal DIN
AutoCal TEC
6
7 1
8
8 0
O
°C TP
Cal AR
S
Multi 340iOperation
33
4.3.6 Salt content correction
A salt content correction is required in the oxygen concentration mea-
surement of samples with a salt content of more than 1 g/l. To do this,
you have to enter the salinity equivalent of the test sample (range 0.0 -
70.0) and to switch on the salinity correction.
Note
With the Multi 340i handheld meter, you can measure the salinity. How
to proceed is described in section 4.4.3 M
EASURING THE SALINITY on
page 36.
Entering the salt con-
tent
Note
How to switch on the salt content correction is described on page 27.
1 Determine the salinity of the test sample (any method, see also
section 4.4.3 M
EASURING THE SALINITY on page 36).
2 Press the key repeatedly until Sal appears on the dis-
play.
3 Enter the salt content with <> <>.
4 Switch to the measuring mode with .
°C TP
cm M
cm
8
LoBat
Time Baud Day.Month No.Ident Year
%
mbar 1
S
RCL AR
Store Auto
Cal
°F
1/
/
K %
TDS UpH Sal
mV/pH
S/ m cm
Lin
Tref25 Tref20
nLF
AutoCal DIN
AutoCal TEC
6
9 6
5
5
O
mg/l
ARng
Sal
0
OperationMulti 340i
34
4.4 Conductivity
4.4.1 General information
Note
Conductivity measurements with the Multi 340i can only be carried out
using the TetraCon 325 measuring cell.
Warning
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result.
The RS232 interface is not galvanically isolated.
Preparatory activitiesPerform the following preparatory activities when you want to measure:
Temperature probeThe TetraCon 325 conductivity measuring cell has a temperature sen-
sor integrated in it. The temperature sensor is shown on the display by
TP.
Temperature
compensationThe nonlinear temperature compensation is set fixed and is shown on
the display by nLF.
Reference temperature,
Tr e fThe reference temperature (Tref) can be switched between 20°C and
25°C. It appears on the display as Tref20 or Tref25. To switch over the
reference temperature, see S
WITCHING OVER THE REFERENCE TEMPERA -
TURE , page 58.
1 Connect a conductivity measuring cell to the measuring instru-
ment. The instrument automatically switches over to conductiv-
ity measurement (status display ).
If the conductivity measuring cell is already connected, press
the key repeatedly until the status display or Sal ap-
pears.
2 Check the selected cell constant or calibrate the measuring in-
strument with the measuring cell (see below).
3 Check the selected cell constant (see below) or calibrate the
measuring instrument with the measuring cell (see section
4.4.5 on page 38).
4Using <> <>, toggle between the measuring modes, con-
ductivity ( in
µS/cm) or salinity (SAL).
Multi 340iOperation
35
Checking the
cell constant 1 Press the key repeatedly until CAL disp appears on the
display.
2 Press the repeatedly until the last calibrated
cell constant is displayed, e. g. 0.472 1/cm.
3 To return to the measuring mode: Press the key when the
correct cell constant is displayed.
4 If you want to recalibrate the cell constant, proceed according
to section 4.4.5 D
ETERMINING THE CELL CONSTANT (C ALIBRATION
IN THE CONTROL STANDARD ) .
O UpH Sal
Store
AR
Auto AutoCal DIN
AutoCal TEC LoBat Cal ARng
Tref25 Tref20
Lin nLF
Sal
% mg/l mV/pH
cm
°° TP
m S/ cm
cm
1/
FC%/K
M
TDS
1
S
mbar
Time Baud Day.Month No.Ident Year P
dSI
RCL
A
L C
L C
S
1
LoBat Lin nLF
Tref20
ARng AR
°° TP FC%/K
M
% mg/l mV/pH
m S/ cm
Sal TDS
Auto Store
Sal
mbar
O UpH
cm
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No.Ident Year 2
074
cm1/
Tref25
RCL
C
Cal
OperationMulti 340i
36
4.4.2 Measuring the conductivity
You can carry out the conductivity measurements as follows:
4.4.3 Measuring the salinity
You can carry out the salinity measurements as follows:
1 Perform the preparatory activities according to section 4.4.1
page 34.
2 Immerse the conductivity measuring cell in the test sample.
3 Press the < > <> keys until in the status display, and the
unit
µS/cm appears. The conductivity value appears on the dis-
play.
1 Perform the preparatory activities according to section 4.4.1
page 34.
2 Immerse the conductivity measuring cell in the test sample.
3 Press the <> <> keys until the Sal status display appears.
The salinity value appears on the display.
AR
8
1
cm1/
/
K % °F
RCL Cal Lin
Tref20
LoBat
M
m
Sal TDS
S
Auto Store
Sal
mbar
% mg/l
O UpH
mV/pH
cm
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No.Ident Year 0
4 2
3
0 5
° TP
S/ cm
C
Tref25
nLF ARng
Tref25
/K
cm1/
°F % 8
mg/l
1
RCL ARng AR LoBat Cal
Tref20
Lin
m S/ cm
M
TDS
S
Auto Store
Sal
mbar
%
O UpH
mV/pH
cm
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No.Ident Year 2
1 2
2
3 3
° TP
Sal
C
nLF
Multi 340iOperation
37
4.4.4 AutoRead AR (Drift control)
The AutoRead function (drift control) checks the stability of the mea-
surement signal. The stability has a considerable effect on the repro-
ducibility of the measured value.
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing . You can
only change to another measuring mode after completion of AutoRead.
1 Call up the or SAL measuring mode with and/or <>
<>.
2 Immerse the conductivity measuring cell in the test sample.
3 Activate the AutoRead function with . The current mea-
sured value is frozen (hold function).
4 Start AutoRead with .
AR flashes until a stable measured value is reached.
This measured value is transmitted to the interface.
5 If necessary, start the next AutoRead measurement with
.
6 To terminate AutoRead: Press the key.
8
1
cm1/
/
K % °F
RCL Cal Lin
Tref20
LoBat
M
m
Sal TDS
S
Auto Store
Sal
mbar
% mg/l
O UpH
mV/pH
cm
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No.Ident Year 0
5 2
3
0 5
°
AR
TP
S/ cm
C
Tref25
nLF ARng
OperationMulti 340i
38
4.4.5 Determining the cell constant (Calibration in the control
standard)
Why determine the cell
constant?Aging slightly changes the cell constant, e. g. by coatings. As a result,
an inexact measured value is displayed. The original characteristics of
the cell can often be restored by cleaning the cell. Calibration deter-
mines the current value of the cell constant and stores this value in the
instrument.
Thus, you should calibrate at regular intervals.
In the delivery condition, the cell constant of the measuring instruments
is set to 0.475 cm
-1 (conductivity measuring cell TetraCon 325).
AutoReadThe calibration procedure automatically activates the AutoRead func-
tion. The AR display indicator flashes. The calibration process is fin-
ished when AR stops flashing.
Displaying the calibra-
tion dataYou can view the data of the last calibration on the display. The pro-
ceeding is described on page 48.
Printing the
calibration protocolThe calibration record contains the calibration data of the current cali-
bration. You can transmit the calibration protocol to a printer via the se-
rial interface (see page 51).
Note
You can automatically print a calibration record after the calibration. To
do so, connect a printer to the interface according to section 4.7.2 be-
fore calibrating. After a valid calibration, the record is printed.
Sample printout:
CALIBRATION PROTOCOL
14.04.01 11:37
Device No.: 99990000
Calibration Conductivity
Cal time: 14.04.01 / 11:37
Cal interval: 180d
Cal Std.: 0.01 mol/l KCL
40.0°C
Conduct./Tref25: 1413µS/cm
Cell Const : 0.478 1/cm
Probe : +++
Multi 340iOperation
39
Calibration evaluationAfter the calibration, the measuring instrument automatically evaluates
the current status of the calibration. The evaluation appears on the dis-
play.
Determining the
cell constantYou can determine the cell constant (conductivity measuring cell Tetra-
Con 325) as follows: Display Cell constant [cm
-1]
0.450 ... 0.500 cm
-1
E3
Eliminate the error according to
chapter 6 W
HAT TO DO IF... Outside the range
0.450 ... 0.500 cm
-1
1 Press the key repeatedly until the status display
CAL CELL appears.
2 Press the key. The CAL display appears, as
well as
–the current, calibrated cell constant (with sensor symbol on
the display) or
–the fixed cell constant 0.475 1/cm (without sensor symbol
on the display). In this case, the measurement parameters
are initialized (see section 4.9 R
ESET ).
3 Immerse the conductivity measuring cell in the control standard
solution, 0.01 mol/l KCI.
4 Press the key.
The AutoRead measurement to determine the cell constant
starts. The AR display indicator flashes until a stable signal is
reached. The cell constant determined is displayed. The mea-
suring instrument automatically stores the cell constants.
AR AR
RCL RCL
O O UpH UpH Sal Sal
Store Store Auto Auto AutoCal DIN AutoCal DIN
AutoCal TEC AutoCal TEC LoBat LoBat ARng ARng
Tref20 Tref20
Lin Lin nLF nLF
Sal Sal
% % mg/l mg/l mV/pH mV/pH
cm cm
° °° ° TP TP
m mS/ S/ cm cm
F FC C% %/ /K K
M M
TDS TDS
1 1
S S
mbar mbar
Time Baud Day.Month No.Ident Year
Time Baud Day.Month No.Ident Year 5 2
0 0774 4
A A
L LC C
cm cm1/ 1/
Tref25 Tref25
Cal Cal
OperationMulti 340i
40
Note
If the error message
E3
E3E3 E3 appears, refer to chapter 6 W HAT TO DO IF...
5 To return to the measuring mode: Press the key. The de-
termined cell constant is taken over for the measurement.
S
1
LoBat Lin nLF
Tref20
RCL ARng AR
°° TP FC%/K
M
% mg/l mV/pH
m S/ cm
Sal TDS
Auto Store
Sal
mbar
O UpH
cm
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No.Ident Year 3
074
Cal
cm1/
Tref25
A
L C
AR
Multi 340iOperation
41
4.5 Calibration intervals (Int 3, Int 4, Int 5)
For each measured variable, a time interval is stored. When it has ex-
pired, you will be reminded to calibrate. After a calibration interval has
expired, the probe symbol of the relevant measured variable flashes. It
is still possible to measure. By calibrating the relevant probe, the func-
tion is reset and the interval starts anew.
The following calibration intervals are set in the factory:
Setting the calibration
intervalYou can change each of these intervals (1 ... 999 days): Measured parameter Designation Default setting
pH/ORPInt 37 days
Dissolved oxygenInt 414 days
ConductivityInt 5180 days
1 Switch off the measuring instrument.
2 Press the key and hold it down.
3 Press the key.
The display test appears briefly on the display. After this, the
measuring instrument automatically switches over to configu-
ration.
4 Press the key repeatedly, until Int 3 ... 5 to-
gether with the required measured variable (pH, O
2 or ) ap-
pears on the display. Example:
5 Set the required interval until the next calibration with <>
<>.
6 Confirm with .
7 Switch to the measuring mode with .
°C 1 TP
ARng
mg/l
LoBat
Baud Day.Month No.Ident Year
Sal
%
mbar
S
RCL AR
Store Auto
°F
1/cm
/K %
TDS UpH Sal
mV/pH
S/ m cm
cm M
Lin
Tref25 Tref20
nLF
AutoCal DIN
AutoCal TEC
4
1
t
4 n
O
1
d
Time
Cal
OperationMulti 340i
42
4.6 Saving data
The Multi 340i portable measuring instrument has an internal data
memory. It can store up to 500 datasets.
A complete data record consists of:
Number of the storage location
Date/time
Measured values of the probes connected
Temperature values of the probes connected
Temperature measuring procedure
ID number
You can transmit measured values (data records) to the data storage
in two ways:
Save manually
Switch on AutoStore (Int 1), see page 44)
4.6.1 Saving manually
You can transmit a measured value to the data storage as follows:
1 Press the key.
The current number (location number No.) of the next free stor-
age location appears under the current measured value on the
display.
2 Confirm with .
The display switches to entering the ID number.
Ident KTP °C 4 2 Tref20
Lin Cal
8
1
S
Sal O U
% mg/l mV/pH
1/cm Sal
AutoCal DIN Tref25
nLF AutoCal TEC RCL
Auto
LoBat ARng AR
Time Baud Day.MonthYear
mbar
TDS
cm M
°F /%
S/ m cm
4
9
9 6
pH
No.
Store
Multi 340iOperation
43
Message StoFull
StoFullStoFull StoFull This message appears when all of the 500 storage locations are occu-
pied.
You have the following options:
3 Using <> <>, enter the required ID number
(1 ... 999).
4 Confirm with .
The measured values are stored. The instrument changes to
the measuring mode.
No. KTP °C 4 2 Tref20
Lin Cal
8
1
S
Sal O U
% mg/l mV/pH
1/cm Sal
AutoCal DIN Tref25
nLF AutoCal TEC RCL
Auto
LoBat ARng AR
Time Baud Day.MonthYear
mbar
TDS
cm M
°F /%
S/ m cm
2
9
9 6
pH
Store
Ident
Saving the current measured value.
The oldest measured value (storage location 1)
will be overwritten by thisPress
Returning to the measuring mode without saving press any key
Outputting the data storage see
section 4.6.3
Clearing the memory see
section 4.6.4
OperationMulti 340i
44
4.6.2 Switching on AutoStore (Int 1)
The save interval (Int 1) determines the chronological interval between
automatic save processes. After the fixed interval has expired, the cur-
rent data record is transmitted to the internal storage and to the inter-
face.
Switching on AutoStore
1 Press the key and hold it down.
2 Press the key. Int 1 appears on the display.
3 Set the required interval between the saving procedures with
<> <> (Selection: 5 s, 10 s, 30 s, 1 min, 5 min, 10 min,
15 min, 30 min, 60 min).
4 Confirm with .
The number of free memory locations appears on the display.
5 Confirm with .
The prompt for the ID number appears on the display.
LoBat
Tref25
nLF
/K %
RCL
Sal
°
AR
TP C
M
m
% mg/l
cm
S/ cm
S
8
cm1/
°F
ARng Cal Lin
Tref20
Sal TDS
mbar
O UpH
mV/pH
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No.Ident Year F
F O
t
1 n
1
Store Auto
S
1
LoBat
Tref25
nLF
/K %
RCL
Sal
°
AR
TP C
M
m
% mg/l
cm
S/ cm
cm1/
°F
ARng Cal Lin
Tref20
Sal TDS
mbar
O UpH
mV/pH
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No.Ident Year e
e r
9
9 4
Store Auto F
Multi 340iOperation
45
As soon as all of the 500 storage locations are occupied, AutoStore is
terminated (Int 1 = OFF). If there are not enough storage locations
available for your measurements:
Output and backup the data storage (see page 46) and
clear the memory (see page 52).
Note
The AutoStore function is interrupted if you start other functions, e. g.
output the data storage. After the other function is finished, the Au-
toStore function is continued. By this, however, temporal gaps in the re-
cording of the measured values will occur.
Switching off AutoStoreSwitch AutoStore off by:
setting the save interval (Int 1) to OFF, or
switching the measuring instrument off and then on again.
6 Set the required ID number with <> <>.
7 Confirm with .
The measuring instrument switches to the last active measur-
ing mode and start the measuring and saving procedure. Au-
toStore flashes on the display.
e r
F
9
9 9
S
1
LoBat
Tref25
nLF
/K %
RCL
Sal
°
AR
TP C
M
m
% mg/l
cm
S/ cm
cm1/
°F
ARng Cal Lin
Tref20
Sal TDS
mbar
O UpH
mV/pH
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No. Year 1 Store Auto
Ident
OperationMulti 340i
46
4.6.3 Outputting the data storage
You can output the contents of the data storage:
Stored data on the display
Calibration data on the display
Stored data on the serial interface
Calibration protocol to the interface
Outputting stored data
on the display
You can perform the following activities:
1 Press the key repeatedly until StO dISP appears on the
display.
2 Press the key.
A measured value appears on the display.
The storage location of the data record is displayed for approx.
2 s, then the respective temperature appears.
Display further data of the data record
(ID number, date, time, storage location)Press
To toggle between two saved measured vari-
ablesPress
+
Advance one data record (storage location) Press <>
Go back one data record (storage location) Press <>
Store Auto
Ident
S
1
LoBat
Tref25
nLF
/K %
Sal
°
AR
TP C
M
m
% mg/l
cm
S/ cm
cm1/
°F
ARng Cal Lin
Tref20
Sal TDS
mbar
O UpH
mV/pH
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No. Year p
ST
O
dI
s
RCL
ARng
No.
Store Auto
%/K
Sal 1/cm
°F 8
%mV/pH
m S/ cm
cm M
Sal
LoBat
Time Baud Day.Month Ident Year
mbar 1
S
AR Cal
TDS UpH
Lin
Tref25 Tref20
nLF
AutoCal DIN
AutoCal TEC
0
3 6
O
mg/l
RCL
TP °C 5 2
0
Multi 340iOperation
47
Note
If you want to search for a certain element of the data record (e. g. date),
proceed as follows:
Outputting stored data
to the interface
Note
You can cancel the transmission with or .
The transmitted data contains the entire contents of the storage in in-
crementing order of the location numbers.
1 Using , select the element (e. g. date).
2 Press <> or <> repeatedly until the required element ap-
pears on the display.
After approx. 2 s the temperature of the displayed measured
value appears.
1 Press the key repeatedly until Sto SEr appears on the
display.
2 Press the key.
The complete contents of the storage are transmitted to the in-
terface. During the data transmission the instrument incre-
ments the storage numbers. After the data transmission, the
instrument automatically switches to the last active measure-
ment mode.
Store Auto
Ident
S
1
LoBat
Tref25
nLF
/K %
Sal
°
AR
TP C
M
m
% mg/l
cm
S/ cm
cm1/
°F
ARng Cal Lin
Tref20
Sal TDS
mbar
O UpH
mV/pH
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No. Year R
St
o
S
E
RCL
OperationMulti 340i
48
Sample printout:
Outputting the calibra-
tion data
on the display
No. 1:
09.03.01 17:10
pH 10.01 25°C
Tauto AR
Ident : 47
No. 2:
09.03.01 17:12
305 mV
Tauto
Ident : 6
No. 3:
09.03.01 17:24
7.88 mg/l 17.6°C
Tauto
Ident : 81
No. 4:
09.03.01 17:46
7.11 mg/l 17.8°C
Tauto
SAL = 17.9
Ident : 4
No. 5:
10.03.01 19:09
2.40 mS/cm 25.3°C
Tauto
nLF
Tref25 C = 0.475 1/cm
Ident : 10
No. 6:
10.03.01 20:48
2.46 mS/cm 25.6°C
Tauto
nLF
Tref25 C = 0.475 1/cm
Ident : 1
...
1 Press the key repeatedly until CAL disp appears on
the display.
Store Auto
Ident
S
1
LoBat
Tref25
nLF
/K %
Sal
°
AR
TP C
M
m
% mg/l
cm
S/ cm
cm1/
°F
ARng Cal Lin
Tref20
Sal TDS
mbar
O UpH
mV/pH
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No. Year dP
CA
L
I
S
RCL
Multi 340iOperation
49
2 Press the key.
The data of the last calibration of all measured variables ap-
pears in the following sequence:
pH: Slope SLO and asymmetry ASY
Dissolved oxygen: Relative slope SLO
Cond: Cell constant C
Information concerning the calibration procedure is output as
well.
3 Press to display the value of the asymmetry
(mV).
4 Press to display the relative slope of the D. O.
probe.
Sal
cm
AutoCal DIN
Day.Month
S
Tref20
Cal
IdentNo. Year
Time Baud 1
TDS Sal
Store
AR
Tref25
cm
C /% KTP °
M mbar
1/
%
m
mg/l
cm S/
Lin
O U
nLF AutoCal TEC
Auto
LoBat ARng
°F O
9
4
pH
L S
RCL
5
mV/pH
Sal
cm
AutoCal DIN
TimeDay.Month
Sal
Store
AR
8
No.Ident
Tref20 Tref25
Year
Baud cm
C /% KTP °
M mbar
1/
%
m
mg/l
cm S/
TDS
6
Lin Cal
1
S
O U
nLF AutoCal TEC
Auto
LoBat ARng
°F Y
0
1
pH
mV
S A
RCL
Cal
Day.Month
2
S
Store Auto
Ident
1
LoBat
Tref25
nLF
/K %
Sal
°
AR
TP C
M
m
% mg/l
cm
S/ cm
cm1/
°F
ARng Lin
Tref20
Sal TDS
mbar
UpH
mV/pH
AutoCal DIN
AutoCal TEC
Time BaudNo. Year O
08
8
S
L
RCL
O
OperationMulti 340i
50
5 Press to display the cell constant. The dis-
played value is:
the current, calibrated cell constant (with sensor symbol on
the display) or
the fixed cell constant 0.475 1/cm (without probe symbol on
the display). In this case, the measured parameters are ini-
tialized (see section 4.9 R
ESET ).
6 With you can switch back to the last active measuring
mode.
Day.Month
Cal
4
8
S
cm
Sal
O
Store Auto
Ident
1
LoBat nLF
/K %°
AR
TP C
M
m
% mg/l
S/ cm
°F
ARng Lin
Tref20
Sal TDS
mbar
UpH
mV/pH
AutoCal DIN
AutoCal TEC
Time BaudNo. Year 08
C
4
7
RCL
cm1/
Tref25
Multi 340iOperation
51
Outputting the calibra-
tion protocol on the
interface
Sample printout: 1 Press the key repeatedly until CAL SEr appears on the
display.
2 Press the key.
The calibration protocol for all measured variables is transmit-
ted to the interface. After the data transmission, the instrument
automatically switches to the last active measurement mode.
d Store Auto
Ident
S
1
LoBat
Tref25
nLF
/K %
Sal
°
AR
TP C
M
m
% mg/l
cm
S/ cm
cm1/
°F
ARng Cal Lin
Tref20
Sal TDS
mbar
O UpH
mV/pH
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No. Year R
CA
L
S
E
RCL
CALIBRATION PROTOCOL
02.03.01 14:19
Device No.: 12345678
Calibration pH
Cal time: 01.03.01 / 15:20
Cal interval: 7d
AutoCal TEC Tauto
Buffer 1 2.00
Buffer 2 4.01
Buffer 3 7.00 *
Buffer 4 10.00
C1 174.1 mV 25.0°C
C2 -133.3 mV 25.0°C
S1 -59.4 mV/pH
ASY1 - 4 mV
Probe: +++
CALIBRATION 02
Cal time: 02.03.01 / 14:19
Cal interval: 14d
OxiCal Tauto AR
Relative Slope: 0,88
Probe: +++
Calibration Conductivity
Cal time: 14.12.00 / 11:37
Cal interval: 180d
Cal Std.: 0.01 mol/l KCL
40.0°C
Conduct./Tref25: 1413µS/cm
Cell Const : 0.478 1/cm
Probe : +++
OperationMulti 340i
52
4.6.4 Clearing the memory
With this function, you can delete the stored data records. 500 storage
locations will then be available again.
Note
The Clear memory function only appears when there are data records
stored in the memory. Otherwise, the measuring instrument automati-
cally switches to the last active measuring mode.
Proceed as follows to clear all data records:
Note
The calibration data remain stored and can be called up.
1 Switch off the measuring instrument.
2 Press the key and hold it down.
3 Press the key.
The display test appears briefly on the display.
4 Confirm the clearing process with .
Pressing any other key prevents the clearing, the data records
will remain stored.
Multi 340iOperation
53
4.7 Transmitting data
You have the following possibilities of transmitting data:
One of the following options:
–With the AutoStore function (page 44), measured values are
periodically saved internally (save interval Int 1) and output on the
interface.
–With the Data transmission interval function (Int 2), measured
values are periodically output on the interface (see below).
–AutoStore (Int 1) covers the Data transmission interval
(Int 2).
Press the key
This manually triggers a data transmission of the current measured
value to the serial interface at any time - independently of the select-
ed intervals.
With the Output data storage function (page 46), calibration data or
saved measured values are output on the interface.
4.7.1 Data transmission interval (Int 2)
The interval to the data transmission (Int 2) determines the chronolog-
ical interval between automatic data transmissions. After the selected
interval expires, the current data record is transmitted to the interface.
Setting the
Data transmission
intervalThe default setting for the interval is OFF.
To start the data transmission, set an interval (5 s, 10 s, 30 s, 1 min,
5 min, 10 min, 15 min, 30 min, 60 min):
1 Press the key and hold it down.
2 Press the key. Int 2 appears on the display.
3 Set the required interval between the saving procedures with
<> <>.
Store Auto
LoBat
Tref25
nLF
/K %
RCL
Sal
°
AR
TP C
M
m
% mg/l
cm
S/ cm
S
8
cm1/
°F
ARng Cal Lin
Tref20
Sal TDS
mbar
O UpH
mV/pH
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No.Ident Year F
F O
t
2 n
1
OperationMulti 340i
54
Note
When the AutoStore function is active at the same time, the data trans-
mission is performed according to the setting of the save interval (Int 1).
Set the save interval (Int 1) to OFF to activate the Data transmission in-
terval (Int 2). 4 Confirm with .
The measuring instrument switches to the last active measur-
ing mode.
Multi 340iOperation
55
4.7.2 PC/external printer (RS 232 interface)
Via the RS 232 interface, you can transmit the data to a PC or an ex-
ternal printer.
Use the AK 340/B (PC) or AK 325/S (ext. printer) cable.
Warning
The RS232 interface is not galvanically isolated.
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result.
Set up the following transmission data on the PC/printer:
Socket assignment
4.7.3 Remote control
The handheld meter can be remotely controlled from a PC. This re-
quires the KOM pilot communication kit. It is available as an accessory.
The instrument is then controlled via commands that simulate key-
strokes and request the current display contents.
Note
A more detailed description is provided within the scope of delivery of
the communication kit. Baud rate can be selected from: 1200, 2400, 4800, 9600
Handshake RTS/CTS + Xon/Xoff
PC only:
Parity none
Data bits 8
Stop bits 2
1 CTS
2 RxD
3 Ground
4TxD 12
3 4
RS 232
REC
OperationMulti 340i
56
4.8 Configuration
You can adapt the handheld meter to your individual requirements. To
do this, the following parameters can be changed (the status on deliv-
ery is marked in bold):
Note
You can leave the configuration menu at any time with . The pa-
rameters that have already been changed are stored.
BaudrateBaud rate 1200, 2400, 4800, 9600
Air pressure display Current value in mbar
(no input possible)
Calibration
intervals–pH 1 ... 7 ... 999 dInt 3
–O
2 1 ... 14 ... 999 dInt 4
–: 1 ... 180 ... 999 dInt 5
Date/time Any
1 Switch off the measuring instrument.
2 Press the key and hold it down.
3 Press the key.
The display test appears briefly on the display. The measuring
instrument then switches automatically to the setting of the
baud rate.
4 Select the required Baud rate with <> <>.
5 Confirm with . CAL dISP appears on the dis-
play.
Day.Month No. Time12 M
m
% mg/l
cm
S/ cm
S
mbar
mV/pH
t
n
Store Auto
LoBat
Tref25
nLF
/K %
RCL
Sal
°
AR
TP C
cm1/
°F
ARng Cal Lin
Tref20
Sal TDS O UpH
AutoCal DIN
AutoCal TEC
Ident Year 0
0 8
4
Baud
Multi 340iOperation
57
Displaying the
air pressureThe air pressure is only displayed if an oxygen sensor is connected.
Otherwise, "---" appears.
pH calibration interval
6 Select the required display during the pH calibration with
<> <>.
mV: Display of the current electrode voltage
/pH: Display of the buffer nominal value.
7 Confirm with . P mbar appears on the display.
RCL
mV/pH
O
Store Auto
Ident
S
1
LoBat
Tref25
nLF
/K %
Sal
°
AR
TP C
M
m
% mg/l
cm
S/ cm
cm1/
°F
ARng Cal Lin
Tref20
Sal TDS
mbar
AutoCal DIN
AutoCal TEC
Time Baud Day.Month No. Year p
CA
L
i
s d
pH
/pH
8 Confirm with . Int 3 and the measured variable
pH appear on the display.
Baud
4
Day.Month No. Time1 M
m
% mg/l
cm
S/ cm
S mV/pH
t
n
Store Auto
LoBat
Tref25
nLF
/K %
RCL
Sal
°
AR
TP C
cm1/
°F
ARng Cal Lin
Tref20
Sal TDS O UpH
AutoCal DIN
AutoCal TEC
Ident Year 9
4 9
mbar P
9 Set th
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Date d'upload du document :
jeudi 30 avril 2020