Meter testing, maintenance and repair

We’re always adding new gas and electric meters to our accreditation program. We’re reviewing and testing a number of meters and hope to service them in the future. Our equipment, methods and people set the industry standard and we stand behind every meter we service.

Please contact us at 1-800-667-4338 or to inquire about any meters you don’t see in the options below, including Coriollis, Ultrasonic or V-cone.

Diaphragm meters

Our services for small and large diaphragm meters include:

  • meter repairs
  • testing and calibrations
  • verification/re-verification
  • compliance sampling
  • seal extensions
  • AMR retrofits
  • non-TC/TC conversions
  • other services available upon request

Diaphragm and Sonix meters

We offer testing and verification services for diaphragm meters, and the Sonix 600 and Sonix 880 meters:

Calibration standard 
Sonix Nozzle Prover, NIST traceable to within +/- 0.5%
Maximum capacity 7,000 ACFH
Minimum capacity 30 ACFH
10’ Bell Prover, Measurement Canada CertifiedMaximum capacity 1,500 ACFH
RTP Provers, Measurement Canada CertifiedMaximum capacity 1,500 ACFH


Rotary meters

Our services for rotary meters include:

  • meter repairs
  • mechanical and electronic module servicing
  • high-pressure (>175 psig) rotary meter servicing
  • testing and calibrations
  • verification/re-verification
  • other services available upon request

Calibration standard

Rotary Transfer Prover, Measurement Canada Certified

  • maximum capacity 35,000 ACFH

Test medium: Air

Request rotary meter testing

Turbine meters

We test flow meters over a wide range of operating conditions, using carbon dioxide (CO2) matched to true operating conditions.  For high-pressure testing, we match the Reynolds Number using the same gas density of CO2 as that of natural gas in field conditions.

Calibration capabilities 
Flow range

350 - 230,000 ACFH (10 - 6,500 m3/hr)

Pressure range
(CO2 test medium)
2" - 12" turbine meter
0 - 235 psig (0 - 1,620 kPa)
Equivalent pressure 610 psig natural gas, based on flow rate and density
Temperature range5 °C - 35 °C (41 °F - 95 °F)
Fluid typeCO2
ANSI rating & sizeANSI 150, 300, 600 and meters sized
NPS 2 to NPS 12
Maximum Reynolds number9,200,000
Measurement uncertainty+/-0.27%
TraceabilityTraceable to international standards through NMI
(Holland Metrology N.V.)
Meter RunsComplete meter runs up to 22' (6.7 m) by special arrangement

Request flow meter testing

Higher pressure, more accurate meter testing results

Traditional tests use air at atmospheric pressure. As a result, some measurements, and consequently calibrations, are inaccurate. By using CO2 at high pressures—duplicating a range of true operating conditions—our high pressure testing process can significantly reduce the margin of error. Here’s what you should know about meter testing:

  • Turbine meters need to be calibrated under in-service conditions for acceptable accuracy. The best calibration results are obtained by matching the in-service Reynolds Numbers and flow rates to the meter being tested.  
  • For a true representation of how a meter will operate in the field it is recommended that it be tested at a higher pressure than atmospheric if the meter is being used at higher pressures in the field.
  • Meters in low-pressure, low-flow applications operate at the lowest Reynolds conditions.  Meter performance can change up to several percent when comparing low-pressure test conditions (typically under 1 to 1.5 million Reynolds Numbers) to high-pressure test conditions. 

The benefits of our high-pressure turbine meter testing service

In addition to our commitment to providing the most accurate test results possible, you can count on us to be:

  • Flexible: we can change pressure and temperature in order to meet your company standards.
  • Certified: our repair facility is certified for Sensus and Instromet meters, and we have extensive experience in Elster and Daniel products.
  • Efficient: we have fast turnaround times, and we complete all shipping and customs documentation and keep a large volume of spare parts on hand to reduce delays.
  • Accessible: all tests can be remotely witnessed, and you can access our test facilities year-round.

Reynolds Number

The Reynolds Number is used to predict fluid flow patterns. It’s a dimensionless ratio of inertial to viscous forces that takes into account the flow rate and physical properties of a fluid. It’s proportional to flow rate and density and inversely proportional to meter diameter and viscosity.

Industry recommendations

American Gas Association (AGA)

Report No. 7 (February 2006), Measurement of natural gas by turbine meter, recommends:

  • A meter calibration carried out in a test facility over a particular range of Reynolds numbers characterize the meter’s performance when used to measure gas over the same range of Reynolds number when the meter is in service. (section
  • The expected operating Reynolds number range and/or density for a meter needs to be taken into account when designing a calibration program. (section 6.3.2)

Energy Resources Conservation Board (ERCB) 

The ERCB regulates the oil and gas industry in Alberta. Directive 17,, item 4 recommends:

  • Meters with moving parts be proved “….at a pressure that is within the normal operating condition for that meter location.”

European Committee for Standardization (CEN)

The Europeans have a similar requirement for testing turbine meters. The CEN document EN 12261-2002, section recommends:

  • For a meter type specified for measurement in a pressure range below or equal to 4 bar, the error of indication test shall be carried out with a gas at atmospheric conditions (± 100 mbar).
  • For a meter type specified for measurement in a pressure range extended above 4 bar, the error of indication test shall be carried out with a gas in the range of the specified metering conditions. The tests shall be carried out at least at the lowest and the highest working pressure specified by the manufacturer. However, for specified maximum pressures above 50 bar, a test at 50 bar is deemed acceptable.

Remote witnessing of high-pressure meter testing

For high-pressure testing services on your turbine meter that require witnessing, you can save time and money by watching your meter being tested remotely. We’ll film the whole test while you watch it, live, on a secure website. 

To arrange this service, please contact us at 1-800-667-4338 or We’ll send you an email with the test date and time, website address and login information.

Turbine meter resources

Learn more about our turbine meter services, and use our calculators:

Electric meters

Our services for electric meters include:

  • meter repairs
  • testing and calibrations
  • verification/re-verification
  • compliance sampling
  • seal extensions
  • asset management
Calibration standard 
PMT 10 position test console, Measurement Canada certified
  • automated multi-position, multi-function test console
  • 120 to 600 volts
  • 0 to 150 amps
  • 0 to 90 kW demand test
Two WECO test consoles (3-Phase), Measurement Canada Certified
  • 20 position fully automated console
  • 69 to 600 volts
  • 0 to 20 amps
  • 0 to 12 kW demand test
  • Radian RD 20 standard (3)