@markz many thanks for that suggestion/information. Will try that as well how to easy and fast after ending observation of the printer to ensure the port again.
@topenga see https://duet3d.dozuki.com/Wiki/Calibrating_thermistor_and_PT1000_readings. Your PT100 reading should be accurate, unless you are using a 2-wire connection and you have significant resistance in the cable to the PT100 (in which case it will read 1C high for every 0.4 ohms of resistance); but you may need to calibrate the bed thermistor input.
Hello DC42,
Thanks for answer.... Will try and return the outcome!