Should supply meters be calibrated or audited?

Depending on the purpose of the related task. If you are only interested in knowing whether the meter is functioning as per a set tolerance for display, output, and volumetric totalization – then a calibration is fine. Ensure all controls are tight and the data used for calibration is unquestioned. However, if you are using … Read more

What are the effects of an incorrectly “zeroed” electromagnetic flow meter?

When an electro-magnetic flow meter is installed, it should be pressurized with the process liquid and then “zeroed” for any inconsistency related to the installation effects.  If this is not done, the value being read during true zero flow will be additive (+ or -) to the actual readings causing great errors during a no … Read more

What levels of verification/calibration are there?

Although there are many ways to provide a better level of confidence, there is only one true way to calibrate – comparing one flow reading against another to a level of confidence outlined in the testing practice to achieve the level of accuracy for each meter. Typical instrumentation programs for annual certificate of approvals doesn’t … Read more

I calibrate all my process/billing meters each year. Does an audit need to be done as well?

An audit is required for many reasons. When there is a balance error where the contribution of error could be directly related to metering When an IWA/AWWA water balance/audit is being done where a level of confidence in the calibration techniques needs to be defined When a current calibration program is not adequate enough to … Read more

Should water meter calibrations be done each year?

A general answer is NO.  This would depend on the benefit or predicted return on the investment to conduct such calibration practices. Working within a greater study incorporating meter selection and changeout, meter sizing, meter verification and meter accuracy programs work together to form a complete metering program.

What is the difference between a balance and an audit?

A Balance is a report outlining all components of a water system accounting for 100% of the water used after production, by means of operational use, theft and inaccuracies, demand and real losses. An Audit is reviewing the information obtained that forms the balance providing clarity of numbers providing 95% confidence against each component in … Read more

Our website uses cookies to enhance your experience and provide you with personalized information. By clicking on the ‘Accept’ button, you are agreeing to our use of cookies, tracking technologies and term and conditions. See our Privacy Policy.