Panametrics GM868 Ultrasonic Gas Flow Meter from RS Hydro

GM868 Ultrasonic Gas Flow Meter

  • Choice Of Meters Single or dual channel meters available capable of measuring all conductive gases
  • Extremely Low Maintenance Has no moving parts, no parts to collect debris and does not require lubrication or routine maintenance
  • Wide Pipe Size Range Capacity to measure pipe ranges from 1 inch to 120 inches
Product Options


The Panametrics GM868 is a multi purpose gas flow meter. The GM868 flow meter is suitable for measuring the flow of most gases including fuel gases, waste gases, stack gases and others. It is a complete ultrasonic flow metering system. The GM868 uses transit time technology to determine flow rates. It can do the job of several conventional meters, due to its wide range of measurement velocities and pipe sizes. The GM868 can measure the flow in pipes ranging from 1 inch to 120 inches in diameter (2.5cm to 3m) and also velocities ranging from 0.1 to 150ft/s. These velocities can be measured in either direction and in steady or pulsating flow.

A two channel gas flow meter can also be chosen to provide maximum accuracy by measuring along two paths in the same channel. The dual channel instrument can also be used to either measure the flow in two separate pipes or even at two seperate points on the same pipe. This flow meter is made by one of the world's leading gas flow meter manufacturers: Panametrics.

The GM868 flow meter for gas is an extremely low maintenance flow meter as it has no moving parts to be worn out, and no parts to collect debris, this means that there is no need to clean, lubricate or do any other routine maintenance. There is also no pressure drop caused by the GM868's transducers, as they do not obstruct the flow, which is a common problem with other types of flow meters.

The GM868 flow meter offers either analogue and digital output options, which make it easy for the user to have the data sent to where it needs to be. There is also the choice of having alarm outputs. These outputs can all be set up and calibrated form the a computer using the Panaview software or from the keypad.

Features and benefits

  • The GM868 can measure all acoustically conductive gases.
  • Very low maintenance flow meter- as it has no moving parts.
  • The GM868's transducers do not cause pressure drops.
  • Suitable for high temperature use.
  • Has a choice of digital or analogue outputs which can be set up from the keypad or computer.
  • Single channel or dual channel meters available (allows flow measurement in two points in the same pipe or in two separate pipes)
  • Wide pipe size range of 1 inch to 120 inches.

Manufactured by: GE Panametrics
Model: GM868 Ultrasonic Gas Flow Meter

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Hydrocarbon gases
Vent gases
Digester gases
Fuel gases
Waste gases
Incinerator air flow
Vapor recovery
Stack gases
Other gases


Operation and Performance
Fluid Types All acoustically conductive gases
Pipe Sizes 2 in to 120 in (50 mm to 3,000 mm) NB and larger
Pipe Materials All metals. Consult GE for other materials.
Flow Accuracy (Velocity) ±1% to 2% of reading typical
Accuracy depends on pipe size and whether measurement is one-path or two-path. Accuracy to ±0.5% of reading may be achievable with process calibration.
Repeatability ±0.2% to 0.5% of reading
Range (Bidirectional) -150 to 150 ft/s (-46 to 46 m/s)
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 3 ft/s (1 m/s).
Measurement Parameters Mass flow, standard and actual volumetric flow, totalized flow, and flow velocity
Flow Measurement Patented Correlation Transit-Time mode
Enclosures - Standard: Epoxy-coated aluminum weatherproof Type 4X/IP66 Class I, Division 2, Groups A,B,C&D
- Optional: Stainless steel, fiberglass, explosion-proof, flameproof
Dimensions Standard: Weight 11 lb (5 kg), size (h x w x d) 14.24 in x 11.4 in x 5.12 in (362 mm x 290 mm x 130 mm)
Channels - Standard: One channel
- Optional: Two channels (for two pipes or two-path averaging)
Display Two independent software-configurable 64 x 128 pixel backlit LCD graphic displays
Keypad 39-key membrane keypad
Power Supplies Standard: 100 to 130 VAC, 50/60 Hz or 200 to 265 VAC, 50/60 Hz
Optional: 12 to 28 VDC, ±5%
Power Consumption 20W maximum
Operating Temperature -4° to 131°F (-20° to 55°C)
Storage Temperature -67° to 167°F (-55° to 75°C)
Standard Inputs/Outputs Two 0/4 to 20 mA isolated outputs, 550 S maximum load
Optional Inputs/Outputs There are six additional slots available for any combination of the following I/O boards:
- Analog outputs: Select up to three additional output boards, each with four isolated 0/4 to 20 mA outputs, 1kS maximum load
- Analog inputs: Select up to three boards of one of the following types:
- Analog input board with two isolated 4 to 20 mA inputs and 24V loop power
- RTD input board with two isolated, three-wire, RTD inputs; span -100° to 350°C (-148° to 662°F); 100 S
- Totalizer/frequency outputs: Select up to three totalizer/frequency output boards, each with four outputs per board, 10 kHz maximum
- Alarm relays: Select up to two boards of one of the following types:
- General purpose: Relay board with three Form C relays
- Hermetically sealed: Relay board with three hermetically sealed Form C relays
Digital Interfaces - Standard: RS232 - Optional: RS485 (multiuser)
- Optional: Modbus® RS485 or TCP protocol
- Optional: Ethernet
- Optional: OPC server
- Optional: Foundation fieldbus
Data Logging Memory capacity (linear and/or circular type) to log over 43,000 flow data points
Display Functions - Graphic display shows flow in numerical or graphic format
- Displays logged data and diagnostics
European Compliance Complies with EMC Directive 89/336/ EEC, 73/23/EEC LVD (Installation Category II, Pollution Degree 2) and PED 97/23/EC for DN<25

Wetted Ultrasonic Flow Transducers

Temperature Ranges - Standard: -58° to 302°F (-50° to 150°C)
- Optional (overall range): -310° to 842°F (-190° to 450°C)
Pressure Ranges - Standard: 0 to 2,700 psig (1 to 187 bar)
- Optional: 3480 psig (240 bar) maximum
Transducer Materials - Standard: Titanium
- Optional: Monel® or Hastelloy® alloys
Process Connections Flanged and compression fittings
Mountings Flanged flowcell or cold tap
Area Classifications - Standard: General purpose
- Optional: Weatherproof Type 4X/IP66
- Optional: Explosion-proof Class I, Division 2, ATEX
Transducer Cables One pair of RG62 AU coaxial cables, 1000 ft (330 m)
High-Temperature and High-Pressure Ultrasonic Flow Transducers Bundle Waveguide Technology System transducer and holder (see BWT System specifications) Pressure and temperature transducers available on request.



No, all of our flowmeters are competitively priced and rental is an ideal option for cutting costs to a fraction of a full priced new flowmeter.
No problem. The quick start guide is designed to make installing the flow meters a simple task. Everything you require for set up will be found in the peli-box supplied with the flowmeter.
Every flow meter is tested upon shipping and return as part of our ISO9001 procedure. Also, as part of this procedure, the flow meter is calibrated once a year. If a copy of the calibration certificate is needed let us know.
The flow meters typically provide an accuracy of ±1 to 2% of rate, so if you are measuring 100l/sec then the accuracy is between 98-102l/sec.
We are here to help. If the self-help and quick start guides do not help, then call one of our technical support engineers on +44 (0) 1527 882060. We have supplied and supported many clamp on rental installations throughout Europe.
First, contact us for a quote. If you are happy with the quote then send us a purchase order. Or alternatively call us with credit card details and fill out and send us a rental agreement form.
If the stock is permitting, and all paperwork is received by 12pm then flow meters can usually be available the next day.
The minimum hire period for flow meters is one week.
Once you have the meter you can rent it for as long as you need it. However, it would help if you can let us know that you wish to extend the rental period. Upon return the meter is off-hired and once checked and tested, an invoice will be issued to you. Also, if you extend your rental past a 4, 8 or 12 week rental threshold, then you are entitled to a discount.
You are only charged for the period of time for which you have the flowmeter. So, if a flowmeter is returned 3 days late you are only charged for 3 extra days, and each of these days is charged at one fifth of the weeks hire cost.
Normally, you will use your own courier but if you have any problems let us know and we can arrange a pick up the day after you notify us, but you will be charged for the carriage and this cost will be added to the invoice.
Without exception, all our flow meters are tested. If you need a 110v plug instead of the standard 230v plug let us know.
All of our standard transducers will do -40degC to +150degC, but this will depend on your application.
  • Liquid: below 50mm CFLP transducers are required, 50-1000mm CRS-402 transducers and 150-8000mm CRS-401 transducers. All the bits you need can be supplied, and delivered with the meter.
  • Gas: below 80mm CRS-402 is required, for 80-300mm the CRS-401/CRV-310 and for above 300mm the CRW-312 transducers are required.
  • High temperatures: For liquid we can measure +450degC for liquid and for gas/steam +250degC. But please consult RS Hydro.
Of course, we make a small surcharge for each set of transducers. Most applications only require one set, but on occasion some people may require two, for more diverse pipe sizes and applications.
As long as the pipe is relatively clean, coatings or paint is usually not a problem for clamp on flow meters but if the pipe is corroded or the paintwork has bubbled then a quick sanding down with sandpaper or a wire brush is recommended.
An ultrasonic wall thickness gauge, that measures to within 0.05mm, is provided as standard with all flow meter rental packages.
The screendump facility on the integrated dataloggers on all our flow meters, allows you to photograph any screen and download it to your pc.
After the equipment has been shipped, it is the responsibility of the hirer. However, in our experience it is rare that any of our flow meters are damaged. Our flow meters are tough, as well as accurate, and reliable.
We have hired more ultrasonic clamp on flow meters than any other company in Europe. We are now one of the world's largest distributors of GE Panametrics flow meters. We always review your application before hire so no unwanted surprises are encountered. Every effort has been made to make your flow meter hire and enjoyable experience: quick start guides to help you set up with ease, online videos for further help, rugged packaging for extra durability anywhere, and real flow engineers available for online/telephone support.