Temperature Element Calibration procedure

The thermocouple and RTD are the two commonly used elements in the industry. Both have different ranges, principles, and accuracy of measurement. But the calibration procedure and equipment remain the same. Before starting the RTD calibration make sure all the apparatus are ready.

• Temperature bath
• Multimeter

The temperature bath uses a highly accurate temperature element like a four-wire RTD as a Master. There are several types of temperature baths are available based on the method used for heating.

In Temperature element calibration we can only able to check the working condition of the element. If any error occurs beyond the acceptable limit then you can't correct it, only needs to replace the element. 

RTD Calibration

Place the RTD inside the temperature bath and set the required temperature in the controller. And after the set temperature reached measure the resistance(ohms) valve using a multimeter.

Undergo 5 point calibration(0-100%)procedure, pt100 has an range of 0-650 degree Celsius. Note down the reading for every point in raising and falling. If the error is above the acceptable range the element is damaged replace with a new one.

Thermocouple Calibration

There are many types of thermocouples available, each has a different range so before starting the calibration refer to the thermocouple chart and note down the mV reading respective to the temperature in the calibration report.

Now undergo the same procedure as you did in rtd calibration. Record the reading for both rising and falling. If any error occurs replace the thermocouple element.