Please follow carefully the following steps in order to calibrate the PT100 temperature sensor:

* Take the calibrators marked as 100 and 140

* Turn on the switch

* Insert the calibrator marked as 100 into the socket of the PT100 sensor

* Press both keys "Up" and "Down" at the same time until "Cal 1" is displayed

* Press the "Start / Stop" key ("100" will be displayed)

* Press the "Start / Stop" key again ("Cal 2" will be displayed)

* Remove the calibrator marked as 100 and insert the calibrator marked as 140

* Press the "Start / Stop" key ("140" and "Off" will be displayed)

* The calibration is completed