Do newly installed flowmeters need to be calibrated?
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A flow meter has been newly installed in the pipeline to measure the flow rate of nitrogen gas; there was no flow meter before. Does this flow meter need to be calibrated? How to verify? Please let me know, thank you
The newly installed flowmeter needs to be calibrated. Calibration is carried out to ensure accurate measurements, and there are generally two methods: 1. **Factory calibration**: Before leaving the factory, the manufacturer calibrates the new flow meter and provides a certificate of conformity along with a calibration report. It is recommended to check whether the report is still valid before installation. 2. **On-site calibration**: After installation, zero-point calibration and parameter setting (such as pressure and temperature compensation) are required to ensure compatibility with actual operating conditions. Regarding the nitrogen flow rate, it is also necessary to check the seal integrity of the pipes to prevent leaks from affecting accuracy. If high precision in measurement is required (such as for trade settlement or process control), it is recommended to entrust a professional institution to carry out online or offline calibration using standard equipment. On a regular basis, process data can be compared to identify any abnormalities and address them promptly. .
Meters and instruments must be tested or calibrated before use; it is not sufficient to rely solely on the product certification. For those meters and instruments that are subject to mandatory inspection for use in trade settlements, they must pass inspection by a qualified testing institution before they can be put into use.
Newly installed flowmeters do indeed need to be calibrated! What was said upstairs is correct; a certificate of conformity cannot replace verification. If the nitrogen flow meter is used for process control or cost calculation, it is recommended to follow these steps: 1. First, determine whether it falls under the category of devices that require mandatory calibration (for example, in cases involving trade settlements); if so, it must be calibrated by a licensed authority ； 2. For those not subject to mandatory inspection, calibration can be entrusted to a third party with CNAS accreditation ； 3. It is recommended to perform zero calibration and range calibration before using a new gauge for the first time; our factory usually keeps the original calibration records for reference. For specific details, refer to the JJG1030-2022 standard~