How do you calibrate a Pyrometer?

Calibrating a pyrometer, which is used to measure high temperatures, typically involves using known temperature reference points. One of the most common calibration methods is to immerse the pyrometer's sensor or probe in a mixture of ice and water, which provides a stable reference point at 0 degrees Celsius (32 degrees Fahrenheit), the freezing point of water.

This calibration method is reliable because the ice-water mixture maintains a constant temperature, ensuring that the pyrometer gives an accurate reading at this well-defined temperature point. This zero point can then be used to validate or adjust the readings of the pyrometer across its range.

Using temperatures from boiling water or employing a digital temperature reading may not provide the same precision or consistency for calibrating a pyrometer as the ice-water combination does. Checking with a thermometer can serve as a verification step once the calibration is complete, but the ice-water method directly establishes the calibration baseline.