How are industrial thermocouples calibrated?
Thread Content
How are industrial thermocouples calibrated?
http://bbs.hcbbs.com/redirect.php?tid=62628&goto=lastpost The replies on this page contain the calibration regulations for some measuring instruments, including thermocouples
For calibration, just buy an HART (FLUKE) oil bath, such as the 9112B or 9150 series. AMETEK is also good, it’s just that their agent in China isn’t very good. That one upstairs is the certification standard.
Thank you to the original poster! Good work! I’ve learned a lot!
It seems that, strictly speaking, thermocouples can only be tested to determine whether they are qualified using standard instruments; they cannot be used for calibration. I’m not sure if my understanding is correct
Thermocouple calibration should be carried out by a qualified metrology department, **with established calibration procedures.
The calibration of thermocouples strictly speaking needs to be carried out at a **metrology department; one can only check whether they are qualified on their own, and this is not the same as proper calibration
Calibration and verification are two distinct concepts; calibration is merely for traceability, while verification follows national standards. Calibration must be carried out at specialized, qualified institutions. It is generally necessary to conduct thorough calibration in cases involving trade transactions, that is, when money is involved. For thermocouples used for internal calculations, standard calibration is sufficient; all that is required is to send them to the manufacturer or a calibration station using a heating furnace or constant temperature bath for calibration. Otherwise, if food factories had to use HACCP and send each batch to a testing agency, they would not be able to produce anything at all.
After saying so much, it seems there’s still no result
Calibrating a thermocouple involves matching the standard thermometer placed in the same heat source with the thermoelectromotive force generated by the thermocouple
Learn*, learn*, thank you. I had the feeling that it hadn’t been calibrated at the factory before
That’s because your company does not have metrological certification; my former company had **Grade 1 certification**, and many large chemical companies are the same way – they have the qualifications to conduct their own inspections. Especially for important temperature measurements, we carry out calibrations in accordance with relevant procedures, using specialized calibration devices. For thermocouples that pass these tests, we issue calibration certificates along with temperature correction values; this falls within the scope of work of a thermal calibration laboratory. This post was last edited by ZZD109 on 2009-4-3 22:19]