Mypin TD4 and pt100 RTD temperature way off

[moclamd]

I have a Mypin TD4 and a 2 wire Pt100 RTD sensor. I have the sensor connected with jumpers between pins 7/10, and 8/9 as the wiring diagram and other posts here suggest. I am getting a temperature reading of about -340f it is cold here, but not that cold. I have tried switching the RTD wires around on pins 7 and 8, with no change. Any suggestions other than "Buy from Aubrins".

 

[jCOSbrew]

Measure the resistance between the RTD wires to figure out the correct orientation. Two wires should have low/no resistance between them.

Do you have MyPin setup for PT100? Default is probably thermocouple.

 

[moclamd]

I assume your suggestion is for a three wire sensor, mine is only two wire. I do have the TD4 setup for a PT100 sensor.

 

[moclamd]

I replaced the sensor with a new 3 wire sensor and the new one worked fine. I suspect it was a bad sensor all along.

 

[jCOSbrew]

Good news. PT100 RTD has 3 wires. Other sensor might have been a thermocouple.