i am using a 331-7KF02 module, where i connect the 4 number Thermocouple on its first four chanel. After i connect the one three wire RTD (PT100 Std.) on its 5th & 6th Chanel as per manual instruction. Thermocouple work fine but RTD temprature value increments of 5 deg Centigrade of its actual temprature, after two or three hours spend, this error is increase to 10 to 12 deg centigrade. i am using shielded cable for RTD and connect the one end of the cable to ground. Please give some guideline how can i overcome on this problem.

Best Regards,

Arif Ahmad.

and this temperature is not really increasing? Make a compare measuring with a thermometer!

nice regards

Hello Arif,

Why do you connect one end to ground? I mean it's not how it is in the manual.

Do you connect the RTD with 2,3 or 4 wires?

Can you measure the RTD resistance at module side (i.e. RTD+Cable) when the difference is 5 and also when it's 10 or 12?

Please use anyPT-100 tableand check whether the module is reading a correct value according to measured resistance and the relevant temperature value in the table.

Best regards,

H-H