Common methods of calibration for high precision digital pyrometers
Precision digital pyrometer usually uses platinum resistance as the temperature sensing element, this kind of precision digital pyrometer with the corresponding platinum resistance sensor to replace the standard mercury thermometer is the international trend, so the study of its calibration method is very necessary.
Resistance measurement calibration method calibration method
Preparation before calibration
If the pyrometer has a calibration function, before power on the working mode will be set to calibration mode, and then will be in the constant temperature bath constant temperature of the first-class standard resistance according to the range of the pyrometer were connected to the pyrometer, and then power on the pyrometer to be stabilized will be the value of the standard resistance calibration certificate entered into the pyrometer, stabilized after the shutdown; will be the working mode of the pyrometer is set to the measurement mode, power on and ready to calibrate. Power on and will be platinum resistance thermometer certificate of the relevant data entered and stored as required.
Calibration point selection
General selection of 25Ω, 100Ω measurement point, according to the need to select other measurement values.
Calibration
According to the range of the pyrometer will be the standard resistance were connected to the pyrometer, to be stabilized by the pyrometer to read the resistance value of the pyrometer.
Calibration method
With fixed-point method or comparison method. Calibration with the comparative method, the standard platinum resistance thermometer and the calibrated pyrometer sensor inserted into the constant temperature bath, to be temperature stabilized after the start of the standard thermometer and the calibrated pyrometer readings, the interval of 1 to 2 minutes and then read once, before and after a total of 2 times.
