It’s such a basic issue and yet it can cause huge operational and maintenance issues as well as create costly process upset and product losses. All this results in lost revenue and safety concerns. The issue is; how do we effectively measure tank levels while being able to isolate the level sensor effectively and protect … Read more
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
It is the most important meter in the system. It is generally the largest meter in the system (certainly if you only have one production meter). The cost of this meter is generally sizeable in nature compared to all other meters as well. It is the starting place of all balance calculations and therefore should … Read more
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
Yes. If a meter is not properly sized, it might be accurate for the range of flows it is designed for however, it might be inaccurate at the flow rates it is trying to measure. This is certainly true for a meter that is oversized.
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
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
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.
No, it is not required if you are willing to accept the numbers as is. Meter calibration is part of a meter verification program. Meter calibration is conducted when a meter falls outside an acceptable level of tolerance within a certain level of confidence. Meter calibration ensures all flows are measured to the best truth … Read more
