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Flowmeter Calibration and Verification

Expert support for open channel and closed pipe meters

Regular calibration / verification of your open channel or closed pipe flowmeters is vital for maintaining data integrity and avoiding costly errors especially for MCERTS-certified installations.

Whether you’re operating a wastewater treatment site, industrial discharge point, or any other flow-critical system, we provide precise, standards-based calibration services backed by decades of experience.

Open channel flow

Thin-plate weirs

A thin-plate weir consists of a plate with a precisely machined notch (typically a triangular V or rectangle) cut out of the top edge. The shape of the cutout creates a relationship between the level of liquid upstream of the plate and the flow passing over the structure.

Flumes

A flume is a specially shaped constriction within an open channel that creates a predictable relationship between upstream liquid level and the flow rate. These structures are especially well-suited to wastewater due to their ability to handle solids within the measured liquid.

Area velocity

An area-velocity flowmeter measures flow by combining two readings: the liquid level (to calculate cross-sectional area) and the velocity of the liquid. Area velocity flowmeters can be a good option for challenging installations where a permanent hydraulic structure is not possible.

Miscellaneous open channel flowmeters

Some open channel sites make use of alternative flow measurement approaches, such as broad-crested weirs, Venturi channels, or hybrid systems. We regularly deal with complex or less-than-ideal open channel arrangements and can provide an accurate assessment of how effectively your meter is working.

All open channel flowmeters require regular calibration to maintain flow measurement accuracy.

To calibrate open channel flowmeters, our specialists:

This ensures your open channel system delivers reliable measurements that reflect real-world conditions. Every calibration includes a full service report and a certificate of calibration.

Closed pipe Flowmeter verification

We carry out on-site verifications of closed pipe flowmeters in their working environment. In a flow measurement system, the pipe arrangement, size, and condition can have a major impact on the accuracy of the flowmeter.

Our surveys assess the performance of the complete flow measurement system, not just the instrument. This allows us to determine the true level of uncertainty under actual operating conditions.

Electromagnetic flowmeters

Most electromagnetic flowmeters are electronically stable and don’t require regular off-site re-calibration. Their performance is much more likely to be affected by on-site factors, such as poor installation or unfavourable flow conditions.

That’s why our engineers use specialist equipment and techniques to evaluate whether your flowmeter is delivering reliable, audit-ready data. Through our in-situ verification process, we identify any hidden issues and provide practical recommendations to restore confidence in your measurements.

This secondary verification process can also be used to validate other closed pipe flow measurement systems, including clamp-on ultrasonic, helical vane, and differential-pressure flowmeters.

Ongoing compliance

If your site includes an MCERTS-certified flowmeter, it must be calibrated or verified between five-year MCERTS inspections.

This is a requirement of the MCERTS standard.

Our service reports provide the documentation and traceability you need for your QMS and audits.

All of our calibration/verification surveys are conducted to the MCERTS standard or better.

Book a calibration visit

Need to schedule a calibration? Whether you’re planning ahead or need a quick check before an inspection, our team is ready to help.