GC868 Clamp On Gas Flowmeter

Panametrics GC868 Gas Flow Meter

  • Proven Ultrasonic Technology For all natural gas flow, with the capacity to log over 43,000 flow data points
  • Non Invasive Installation Specifically for metering erosive, corrosive, toxic, high-purity or sterile gases where penetrating pipe wall is undesirable
  • Correlation Transit-TimeTM Demonstrated accuracy is at better than +/-2 percent of reading with +/- 0.5 percent repeatability
Product Options


The Panametrics GC868 uses proven ultrasonic technology for all natural gas flow, fixed installation applications. It allows fast, low cost installation on existing gas mains with no need to interrupt or tamper with the gas line. This means no pressure drop, no shutdown and no regular maintenance required.

The GC868 can measure on pipes from three-quarters of an inch to 24 inch, and requires pressures from 7-barg in metal pipes. In plastic pipes, this gas flowmeter can work on ambient pressure. It comes complete with ATEX Certification.

The flowmeter is comprised of the GC868 electronics, a pair of advanced clamp-on ultrasonic transducers, a clamping fixture, a preamplifier located near the transducers and coaxial cables to connect the transducers to the preamplifier and GC868 electronics. The DigitalFlow GC868 flowmeter can be used to measure the flow of any gas or steam.

Manufactured by: GE Panametrics
Model: Panametrics GC868 Gas Flow Meter

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


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


Operation and Performance
Fluid Types Acoustically conductive gases with minimum density requirements (see Installation Requirements Table)
Pipe Sizes - Most gases: 0.75 to 24 in NB (20 to 600 mm DN) and larger
- Steam: 4 to 12 in NB (100 to 300 mm DN)
Pipe Wall Thickness Thicker walled pipes require higher gas density (see Installation Requirements Table)
Pipe Materials Most 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 larger than 6 in (150 mm): ±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) See Installation Requirements Table
Rangeability (Overall) See Installation Requirements Table
  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).
Measurement Parameters Standard and actual volumetric flow, and flow velocity
Flow Measurement Correlation Transit-Time mode
Enclosures - Standard: Epoxy-coated aluminum
Type 4X/IP66 Class I, Division 2, Groups A,B,C&D
- Optional: Stainless steel, fiberglass, explosion-proof,
flameproof II 2 G EEx d IIC T6)
Dimensions Standard: Weight 11 lb (5 kg), size (h x w x d) 14.24 x 11.4 x 5.1 in (362 x 290 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, tactile-feedback 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 20 W maximum
Operating Temperature -10° to 55°C (14° to 130°F)
Storage Temperature -40° to 70°C (-40° to 158°F)
Standard Inputs / Outputs Two 0/4 to 20 mA isolated outputs, 550 Ω 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,1 kΩ 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 24 V loop power
- RTD input board with two isolated, three-wire, RTD inputs; span -100° to 350°C (-148° to 662°F); 100 Ω Pt
• Totalizer/frequency outputs: Select up to three totalizer/frequency output boards, each with four outputs per board, 10 kHz maximum. All boards allow software-selectable functioning in two modes:
- Totalizer mode: Pulse per defined unit of parameter (e.g., 1 pulse/ft3)
- Frequency mode: Pulse frequency proportional to magnitude of parameter (e.g., 10 Hz = 1 ft3/h)
• Alarm relays: Select up to two boards of one of the following types:
- General purpose: Relay board with three Form C relays; 120 VAC, 28 VDC maximum, 5 A maximum; DC 30 W maximum, AC 60 VA
- Hermetically sealed: Relay board with three hermetically sealed Form C relays; 120 VAC, 28 VDC maximum, 2 A maximum; DC 56 W maximum, AC 60 VA
Digital Interfaces - Standard: RS232
- Optional: RS485 (multiuser)
- Optional: Modbus® RS458 or TCP protocol
- Optional: Ethernet
- Optional: OPC server
- Optional: Foundation fieldbus
Site Parameter Programming Menu-driven operator interface using keypad and “soft”
function keys
Data Logging Memory capacity (linear and/or circular type) to log more
than 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)
Clamp-On Ultrasonic Flow Transducers
Temperature Ranges - Standard: -40° to 130°C (-40° to 266°F)
- Optional (overall range): -40° to 230°C (-40° to 446°F)
Mountings Anodized aluminum or stainless steel clamping fixture
with rigid rails, chain or strap
Area Classifications - Standard: General purpose
- Optional: Weatherproof Type 4X/IP65
- Optional: Explosion-proof Class I, Division 1, Groups B,C,&D
- Optional: Flameproof II 2 G EEx md IIC T6-T3



Yes, the ordering process is very easy. Orders can be made via purchase order or by credit/debit card. Once we have the paperwork we can delivery next day to any location in Europe. Provided with the equipment is a quick start guide, and if you need extra support, the technical support engineers can be contacted via phone call.
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.