Gas detector calibration
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Our company is located in a small city in the northeast, and the alarms in the factory need to be regularly calibrated every year. The original calibration institution was a metrology office in a county-level city, and its practices were not very standardized (the staff’s competence was low, and their skills were not thorough). During each calibration, only a standard gas of one specific concentration was used; as long as the alarm displayed a value, it was considered satisfactory. The calibration procedures were not followed properly, yet certificates were still issued. For this reason, a municipal metrology institute was used this year; originally it was hoped that the calibration team would be more professional, but alas, it’s in a terrible state. Please share your opinions on the staff from the metrology institutes that come to your company for inspections. Are all metrology institutes across the country just slacking off, using **’s money to go through the motions without really doing anything, and failing to implement **’s mandatory standards?
They’re all the same; very few are actually done in accordance with the testing procedures....
On our end, we carry out inspections and adjustments, following the regulations strictly
So in your place, do you use several calibration gases for repeated testing during each verification?
Inspection + debugging. But the testing process involves introducing a standard gas; if a response is obtained within the specified time, it is considered successful. Hello, I’m fine, and everyone else is fine too. If you want a reliable calibration for the alarm, it’s better to do it yourself; you can buy some standard gases and conduct the calibration on-site. Here, our alarms for hydrogen fluoride and hydrogen cyanide can’t detect them at all; what about you guys…?
We are a unit responsible for calibrating combustible gas detectors, and we carry out these calibrations in accordance with the JJG 693-2011 standard titled \"Procedures for Calibrating Combustible Gas Detection and Alarm Devices.\" The safety department conducts regular inspections of our work; if we fail to comply with these procedures, we have our bonuses deducted. We operate as part of a large petrochemical company that has over 7,000 combustible gas detectors, and our calibration center is affiliated with this company, giving the safety management department the authority to evaluate our performance
Stay calm; it’s all the same. The original poster is worrying too much. It’s time for a raise; P
No matter how accurate that device is, the results will differ if it’s used a second time. It’s completely impossible to find any weak point. Actually, first of all, this thing must be available, and secondly, it must be reportable. In the event of an incident, the most common question is why no police report was filed, and checks are made to see if there are any verification records. So using sample gas to blow it before issuing the certificate shows a certain level of seriousness. After all, they have the qualifications recognized by ZF.
You are from a company – do you also use the four types of gas, namely zero-point gas, 10%, 40%, and 60%, for testing?
It’s the same with those small enterprises at the county level – it’s sufficient for the relevant authorities to come and give some instructions; if the time isn’t accurate, one has to adjust it oneself. A certificate is issued after a fee is paid, and that’s it: lol