I'm trying to revamp my companies thermometer calibration procedures and have some questions about acceptable reference thermometers.
We are currently using 2 Atkins cooper thermocouples with attachment probes.
They are verifying their calibration of these thermometers against each other in an ice bath.
They are both NIST thermometers that are sent out annually for calibration. We verify the probes internally.
We use these thermometers to monitor our CCP temperatures.
The way they are calibrating the thermometers against one another is not acceptable to me. They would also need a NIST certified Reference thermometer as well right? This thermometer would only be used for reference and nothing else and then we would be able to calibrate the two Atkins devices against this?
I may be over thinking the process, but i've always used a reference thermometer for reference and nothing else.