Regarding instrument calibration labels

The instruments I bought were already calibrated before being delivered; their metrology department simply attached a label to them

We’re more or less the same, but don’t they conduct periodic inspections? For example, once every 2 years or once a year.

I wonder if all companies do this the same way, and also don’t conduct periodic self-checks? Use it until it breaks? ?

On-site pressure gauges and the like are used to conduct pressure tests; flow meters, on the other hand, are generally sent away for testing. Different forms require labeling once a year in some cases, and once every few years in others; however, the labels are not removed for verification – they are simply placed there to indicate that an inspection has been carried out

We do the same thing, but since flow meters and similar devices are labeled, shouldn’t there be corresponding inspection records as well? If someone from the outside comes to check the records, does the absence of records mean there’s a problem? So I’d like to confirm: how do other companies handle the recording of flow meters?

Typically, factories only set standards for temperature and pressure; for internal inspections, a certificate label is attached, and the measurement department maintains corresponding records. Important metering devices such as vortex flowmeters and electromagnetic flowmeters need to be removed and sent to a third party for inspection. For non-settling meters, when there are doubts about their accuracy during production, the production team provides the necessary conditions to conduct simple experiments using makeshift methods: filling the tank with a medium, calculating the cumulative flow rate based on the level difference over a certain period of time, and then converting this to determine the instantaneous flow rate for comparison.

Yes. . We also send the flow meters used for settlement for inspection. But there are many other ordinary flowmeters, and inspections are usually carried out only when there are doubts about production. There are no regular calibration checks. So I wonder if these are needed? Otherwise, how can the corresponding label be pasted? A calibration label was attached, but no record was kept.

It depends on the requirements of the factory; generally, temperature and pressure are calibrated according to the classification levels specified by instruments ABC, following their respective calibration schedules； For other meters, periodic inspections are carried out on a monthly basis by designated personnel from the production and instrumentation departments; these inspections involve checking the parameter settings of meters such as electromagnetic flowmeters, vortex flowmeters, and thermal flowmeters. For differential pressure meters, the parameters and zero points are checked, and corresponding records are kept. In 2006, at the factory where I used to work, there was an idea to develop a set of calibration equipment for electromagnetic flowmeters. I went to Chongqing’s Chuanyi Company to discuss this matter; the cost for a set of equipment designed for medium and small diameters was 6,000 yuan, while for larger diameters it was 3 times that amount. In addition to the financial costs, there were also complicated requirements regarding certification, and in the end nothing came of it: lol

The issue is the large quantity; detection devices are expensive, so I don’t know how other companies handle it

Could anyone from another company’s maintenance team let me know?