RTD Calibration
RTD Calibration
(OP)
We exclusively use RTDs at our site for temperatures measurement. For 75% of the time we have an associated transmitter, but for our older facility we have RTD going straight back to the DCS IO Card. So for ISO reasons we have to calibrate each RTD each year. For the transmitters we simply shoot the loop to check integrity of the loop. For the RTD's that go straight back to the IO card we use a dry block to check calibration for each thermocouple. Obviously this is very time consuming. Is there any other way to check the proper function of RTDs without using a dry block?





RE: RTD Calibration
Techs I know claim that oil baths are quicker to heat up a sensor than dry blocks because there's more heat capacity in the oil than in the relatively low mass aluminum block that most dry blocks use.
Dan
RE: RTD Calibration
If that's acceptable for the transmitter then why not just use a decade box for the other RTD's with the direct input?
Also I'm not sure what you mean when you say that you're using the dry block to test the thermocouple when you said that you only have RTD's.
RE: RTD Calibration