I’d like to ask the experts in this field: how should thermocouples be calibrated?
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There is already one process calibrator available; now we need to calibrate thermocouples. My questions are: 1. Is a constant temperature bath or other equipment required? 2. How should the wires be connected between the process calibrator and the thermocouple, and how should the calibrator be set up? Welcome to all the experts for sharing your thoughts; thank you! ! !
It doesn’t matter whether it’s available or not; what’s important is to have standard thermocouples and a tube furnace.
Is it by comparing the values with a standard instrument and the thermocouple under test?
A constant temperature oven is sufficient; it has a temperature display, so a standard device isn’t needed. That’s how we do it in our company: using a constant-temperature oven, we select five different temperature points, heat the oven to each of those temperatures, measure the output temperature reading from the thermocouple, then move on to another temperature point and repeat the process. However, our tester is capable of generating curves, so for your verification sheet, just conducting a measurement will suffice.
Follow the calibration procedures specified in JJG 351-1996, Calibration Procedures for Industrial Ferroelectric Thermocouples
This post was last edited by xxkhc on 2019-5-1 15:01. To calibrate thermocouples, a tubular electric furnace, standard thermocouples, and a standard DC potentiometer are required. A process calibrator cannot be used as a standard gauge. Follow the procedures below:
There’s a new standard that you can refer to.
According to the calibration procedures, select a Class II standard thermocouple (either an expensive one or a cheap one), a tubular furnace, and a temperature control device (including a computer), and then proceed with the operations in accordance with the existing calibration procedures. Finally, data processing is performed. Evaluate whether the thermocouple is qualified based on the error calculation results and uncertainty.
For on-site calibration, a dry oven is the most convenient option.