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The Panametrics PT878GC now brings all of the benefits of clamp-on transit time flow measurement to gas applications. Until recentley this was not possible as existing methods could not work on gas flows in metal pipes. The PT878GC works with gases and high or low pressures and in pipes of varied construction including all metals and most plastics. It is especially useful for metering corrosive, erosive, sterile or high-purity gases, or in any application where penetrating the wall of the pipe is not desirable.
As there is no tapping or cutting of the pipe, installation and maintenance costs are greatly reduced. The PT878GC has no wetted or moving parts, causes no loss of pressure and has an extremely wide rangeablility. It has been tested thoroughly on metal pipes with diameters ranging from 0.75 to 24 inches, and it is suitable for measuring the flow of any gas.
 The difficulty in transmitting an ultrasonic signal through a metal pipe wall, through a gas and then back again through the wall of the pipe to a second transducer prevented the development of effective ultrasonic gas flowmeters for many years. In ultrasonic gas applications using traditional transducers only 4.9 x107 percent of the sound energy transmitted from the first transducer is recieved by the second. Which isn't enough to give reliable measurements. The latest clamp-on transducer technology utilised in the PT878GC produces signals that are 5 to 10 times more powerful than traditional transducers, producing clean coded signals with minimal background noise.
The large LCD screen presents data in both alphanumeric and graphic forms. It also makes programming easier with a software menu that walks the user through function selection and data entry. Standard alphanumeric functions include totalised flow, flow velocity and mass or volumetric flow. Both real time and logged data can be viewed in graphic mode which is very useful for reviewing data and observing trends in the field.
The lightweight construction, compact size, rechargeable battery pack and universal power adapter make this the ideal go-anywhere gas flow meter.
Panametrics PT878GC Specifications
| Gas Types |
Acoustically conductive gases with minimum pressure requirements. See Installation Requirements table. |
| Pipe Size Ranges |
0.75 to 12 in (20 to 300 mm) with PT878GC-01 electronics
4 to 24 in (100 to 610 mm) and larger with 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 typical
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| Repeatability |
±0.2% to 0.5% of reading |
| Rangeability (Overall) |
150:1 |
| Measurement Parameters |
Standard and actual volumetric flow, flow velocity and mass flow |
| Flow Measurement |
Patented Correlation Transit-Time mode |
| Enclosure |
Submersible IP67 |
| Dimensions |
Weight 3 lb (1.36 kg),
Size (h x w x d) 9.4 x 5.5 x 1.5 in. (238 x 138 x 38 mm) |
| Display |
240 x 200 pixel backlit LCD graphic display |
| Keypad |
25-key, rubberized tactile membrane keypad |
| Internal Battery |
Rechargeable battery: 8 hours of continuous operation |
| Battery Charger Input |
100 to 250 VAC, 50/60 Hz, 0.38 A |
| Memory |
FLASH memory, field-upgradable |
| Operating Temperature |
20° to 55°C (4° to 131°F) |
| Storage Temperature |
40° to 70°C (40° to 158°F) |
| Digital Interface |
Infrared communication port for printer or PC interface |
| Site-Parameter Programming |
Menu-driven operator interface using keypad and soft function keys
Online help functions including pipe tables
Storage for saving site parameters
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| Data Logging |
Memory capacity to log over 100,000 flow data points
Keypad programmable for log units, update times, and start and stop time
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| Display Functions |
Graphic display shows flow in numerical or graphic format
Displays logged data
Extensive diagnostic parameters
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| European Compliance |
Battery-powered system complies with EMC Directive 89/336/EEC |
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