Do pressure transmitters, thermocouples, etc. need to be calibrated?

Now, it is sent to third-party testing institutions for verification, with the reports issued by those third-party institutions.

Mandatory inspection is required for those used in trade settlement, security protection, healthcare, and environmental monitoring. The “Catalogue of Working Measuring Instruments Subject to Compulsory Verification in the People’s Republic of China” contains specific provisions. Pressure gauges and gas detectors are both listed in the catalog (gas detectors are listed there as: gas meters, gas alarms, gas detectors). Pressure transmitters, thermocouples, and thermal resistors fall outside the scope of mandatory inspection when trade and safety considerations are not involved. There is a classification issue here: for example, in the case of a pressure vessel, if it is equipped with a pressure gauge, then the transmitter belongs to the category of control instruments; whereas if there is only a pressure transmitter, then the entire transmitter system falls under the category of safety instruments. (This is just an example; in reality, pressure vessels without pressure gauges are strictly prohibited from use.) Large state-owned enterprises (such as Sinopec) generally possess the necessary measurement capabilities, allowing them to conduct self-inspections using devices such as pressure gauges and gas alarms ； At the same time, with departmental authorization, qualifications such as automated instrument calibration for instrument technicians can be granted. For work and control instruments, self-check is available. However, when it comes to mandatory inspection items, those without self-inspection qualifications can only send the samples for inspection outside.

As a construction worker, I can say that we conduct our own verifications, which are known as instrument calibration checks. According to the construction standards, my task is to prevent errors from occurring after the instruments arrive at the site and before they are installed, errors that might result from bumps during transportation or other factors. That’s why verification is necessary. For this purpose, we need to use instruments that have been tested by the Technical Supervision Bureau; devices such as those made by Fluke or 744 are commonly used for this purpose. Some are related to measurement (such as flow meters, etc.) and safety (flammable gas detectors). The owner arranges for these to be inspected by the local or external quality and technical supervision authorities, and then they are sent back to the site where our construction team installs them.

Bro, are there any relevant guidelines? Also, it seems that everyone agrees that it’s not enough to just conduct tests; what’s important is to have guidelines in place before anything can be done – otherwise, how can we convince the management?

Bro, are there any relevant guidelines? Also, it seems that everyone agrees that it’s not enough to just conduct tests; what’s important is to have guidelines in place before anything can be done – otherwise, how can we convince the management?

Bro, are there any relevant standards? I know that testing requires authorization from the quality control department and personnel with the necessary qualifications. But what exactly are those standards? That’s very important; only standards can be persuasive and binding

The calibration standard for pressure transmitters themselves requires an inspection once a year, and this is the basis we follow

Automotive pressure transmitters – they can be left in place for 10 years or 20 years without any inspection; only when they break do people replace them. Who dares to say that automobile manufacturers and users don’t pay attention to precision? Who dares to say I’ll spit in their face or pee on them?:lol There are many technical methods to ensure that pressure transmitters maintain their precision....... Whether an instrument needs to be calibrated regularly depends on its purpose, the situation, whether it’s necessary, and what the long-term stability characteristics of the device are. Relying solely on a set of metrological calibration regulations as the technical guideline is too rigid and dogmatic; dogmatism is a bad thing. Those who disagree are welcome to read volumes 1–4 of Mao Zedong’s Selected Works.

Measurement Law of the People’s Republic of China; Implementing Rules of the Measurement Law of the People’s Republic of China (as amended in 2018)