How to perform temperature sensor calibration at site ?
How to perform temperature sensor calibration at site ?
(OP)
How to perform Temperature Transmitter and temperature gauge Calibration at Site ? What are the tools required to perform calibration of RTD OR Thermocouple ?





RE: How to perform temperature sensor calibration at site ?
Google "dry block calibrator" - probably one of the more portable methods. Precision will not be comparable with a lab-grade platinum RTD, but you should be able to find calibrators to get within 1 deg. C of error or less.
RE: How to perform temperature sensor calibration at site ?
In my past career with the thermocouple system we used to instrument equipment under test with a number of test points of interest, while undergoing a THA test cycle, an initial reference check with all thermocouples in an ice/slury mix to check calibration at 32F was sufficient. e.g. http://www.thermoworks.com/learning/thermapen101_c...
RE: How to perform temperature sensor calibration at site ?
RE: How to perform temperature sensor calibration at site ?
RE: How to perform temperature sensor calibration at site ?
A decade box is used for RTD, you cannot adjust the probe only the transmitter.
A thermocouple calibrator for thermocouple transmitters, these used to be based on a Wheatstone bridge and a standard cell with Cold Junction Compensation but I'm surely way out of date.
Ice or boiling water as a quick and dirty check.
RE: How to perform temperature sensor calibration at site ?
RE: How to perform temperature sensor calibration at site ?
You assume your Platinum wire RTD is accurate, if not don't fudge the transmitter to make up for it.
Substitute a precision decade box and set the transmitter to give the correct output.
You cannot always get access to the temperature element for example the 10 Ohm Copper or thermistors in a motor but the Decade box is universal.
Sometimes you encounter American Curve .00392 when expecting European curve .00385 RTDs, I can see a fluidized bed being useful for that but boiling water will do just as well to identify the type.
Thermocouples don't drift either, use hot water and a thermometer to prove it's working but a calibrator for setting the transmitter.
RE: How to perform temperature sensor calibration at site ?
RE: How to perform temperature sensor calibration at site ?