manuel du débitmètre à ultrasons portable pour gaz transport PT878GC

TransPort® PT878GC

Panametrics portable gas ultrasonic flowmeter

Applications

• Natural gas
• Compressed air
• Fuel gases
• Erosive gases
• Corrosive gases
• Toxic gases
• High-purity gases
• Air separation gases

Features

• Clamp-on unobstructed installation
• No wetted parts
• No moving parts
• No pressure drop
• Sound speed output
• Standard volumetric flow calculation
• Small, lightweight, and easy to use
• Large, backlit LCD display
• Rechargeable battery pack
• Logs over 100,000 flow data points
• Submersible package
• 32 site locations
• Optional thickness gauge

Portable flow metering at its best

The TransPort PT878GC flowmeter is a highly versatile, self-contained, portable transit-time system with options and accessories to meet a variety of gas flow measurement needs. Its compact size, lightweight, rechargeable battery pack, and universal power supply charger make it the ideal go-anywhere flowmeter.

Historically, clamp-on flow metering was limited to liquids because existing methods could not work on metal pipes containing gases. Panametrics developed new technology that extends all the benefits of clamp-on flow metering to gas measurement. This remarkable ultrasonic technology works with gases at high or low pressure in pipes made of metal and most other materials.

The TransPort PT878GC flowmeter can be used to measure the flow of any gas. It is especially useful for metering erosive, corrosive, toxic, high-purity, or sterile gases, or in any application where penetrating the pipe wall is undesirable. Since no tapping or cutting of the pipe is required, permanent installation costs are significantly reduced. The meter has no wetted or moving parts, causes no pressure drop, and has very wide rangeability. The new meter was tested extensively on metal pipes with diameters as small as 0.75 inches (20 mm) and as large as 24 inches (600 mm). This meter is suitable for measuring the flow of air, hydrogen, natural gas, and many other gases.

No pressure drop, low maintenance

Because the transducers clamp onto the outside of the pipe, they do not obstruct the flow inside the pipe. This prevents the pressure drops typically caused by other types of flowmeters. The TransPort PT878GC has no components that will foul or collect debris, and there are no moving parts to wear out. As a result, it requires no lubrication and little or no routine maintenance.

Advanced clamp-on ultrasonic transducers

One of the biggest challenges in developing clamp-on ultrasonic transducers for gas applications is the difficulty in transmitting a coded ultrasonic signal through a metal pipe wall, through the gas, and then back through the pipe wall to the second transducer that is waiting to receive the signal. In gas systems, only 4.9 x10–7 percent of the transmitted sound energy is actually received by traditional ultrasonic transducers. This simply isn’t enough to produce reliable measurements.

The new line of clamp-on gas transducers produces signals that are five to ten times more powerful than those of traditional ultrasonic transducers. The new transducers produce clean, coded signals with very minimal background noise. The result is that the TransPort PT878GC flowmeter system performs well even with low-density gas applications.

PT878GC specifications

Data logging

• Memory capacity to log over 100,000 flow data points
• Keypad programmable for log units, update times, and start and stop time

Display functions

• Graphic display shows flow in numerical or graphic format
• Displays logged data
• Extensive diagnostic parameters

European compliance

Battery-powered system complies with EMC directive 89/336/EEC

Clamp-on ultrasonic flow transducers

• Temperature ranges: Standard: -40°F to 266°F (-40°C to 130°C), Optional (overall range): -40°F to 446°F (-40°C to 230°C)
• Transducer materials: Stainless steel and plastic
• Mountings: Portable gas-transducer clamping fixtures in polycarbonate carrying cases:
• PCFG-1 for pipes smaller than 12 in (300 mm) in diameter
• PCFG-2 for pipes larger than 12 in (300 mm) in diameter
• Mounting couplant: CPL-16
• Area classifications:
• Standard: general purpose
• Optional: weatherproof Type 4 IP65
• Optional: explosion-proof Class I, Division 1, Groups C and D
• Optional: flameproof II 2 G EEx md IIC T6–T3 (certification pending)

Electronics

• Operation and performance: Fluid types: Acoustically conductive gases with minimum pressure requirements. See installation requirements table.
• Pipe size ranges:
• 0.75 in to 12 in (20 mm to 300 mm) with TransPort PT878GC-01 electronics
• 4 in to 24 in (100 mm to 610 mm) and larger with TransPort PT878GC-02 electronics
• Pipe wall thickness: Thicker walled pipes require greater gas density. See Installation Requirements Table.
• Pipe materials: All metals and plastics. No lined pipes.
• Flow accuracy (velocity): For pipes 6 in (150 mm) and smaller: ±2% to 5% of reading typical, For pipes over 6 in (150 mm): ±1% to 2% of reading.
• Repeatability: ±0.2% to 0.5% of reading
• Range (bidirectional): See Installation Requirements Table.
• Rangeability (overall): 150:1
• Specifications assume a fully developed flow profile (typically 20 diameters upstream and 10 diameters downstream of straight pipe run) and flow velocity greater than 5 ft/s (1.5 m/s). Pipes 2 inches (50 mm) or less require a minimum of 10 ft (3 m) of continuous straight run without flanges, welds or coupling joints.

Measurement parameters

• Standard and actual volumetric flow, flow velocity, and mass flow

Quick and easy to use

It’s possible to make the first flow measurement within minutes of opening the box—the TransPort PT878GC flowmeter is that easy to use. Input the site parameters, clamp the transducers onto the pipe, and adjust the spacing. No ancillary equipment is needed, and there’s no need to break into the pipeline. An experienced user can make scores of different measurements in a single day. The TransPort PT878GC flowmeter is ideal for all kinds of flow survey work.

Built to be economical and stay economical

To be of real value, a portable flowmeter must be as economical to own and operate as it is capable in the field. The TransPort PT878GC flowmeter is built to stay in service for many years. Completely solid state, the device rarely wears out or needs servicing, resulting in little downtime and low maintenance costs.

Optional pipe wall thickness-gauge transducer

Pipe wall thickness is a critical parameter used by the TransPort PT878GC flowmeter for clamp-on flow measurements. The thickness-gauge option allows accurate wall thickness measurement from outside the pipe.

Copyright 2021 Baker Hughes Company. All rights reserved.

BHCS38744 (01/2021) panametrics.com