Francky

Hi @Fausto Connecting the sensor directly to the MCC-134 was the solution. The mini thermocouple connectors or the leads may be the culprit. I'll investigate more but thank you for your help.

Hi @Fausto I thought that was the issue, temperature started reporting fine but then crept up slowly without reasons. I will try replacing my thermocouple junctions and will report back. Found MCC134 at address [HatInfo(address=1, id=323, version=1, product_name='MCC 134 Thermocouple Input HAT')] Found MCC128 at address [HatInfo(address=0, id=326, version=1, product_name='MCC 128 Voltage HAT')] Channel 0 set to Type 1 Coefficient MCC134CalInfo(slope=0.9995942395331735, offset=-5.424700045439295) Channel 1 set to Type 1 Coefficient MCC134CalInfo(slope=0.9995924187283793, offset=-24.076377532285278) Channel 2 set to Type 1 Coefficient MCC134CalInfo(slope=0.9995927307750806, offset=-27.509583343136) Channel 3 set to Type 1 Coefficient MCC134CalInfo(slope=0.9995938139937812, offset=-22.98250636926832) Logging Interval (sec) 60 Logging temperatures, Ctrl-C to exit. Temperatures: 3.78 4.35 25.03 21.08 Voltage: 0.198 4.296 Temperatures: 3.78 4.35 25.03 21.08 Voltage: 0.197 4.269 Temperatures: 4.24 4.55 25.07 21.17 Voltage: 0.196 4.307 Temperatures: 4.70 4.84 25.35 21.56 Voltage: 0.196 4.257 Temperatures: 5.24 5.27 25.68 21.88 Voltage: 0.196 4.222 Temperatures: 6.10 6.05 26.37 22.57 Voltage: 0.196 4.252 Temperatures: 6.68 6.51 26.68 22.91 Voltage: 0.196 4.332 Temperatures: 7.31 7.03 27.10 23.42 Voltage: 0.196 4.351 Temperatures: 7.52 7.29 27.35 23.52 Voltage: 0.196 4.234 Temperatures: 7.78 7.58 27.63 23.86 Voltage: 0.196 4.291 Temperatures: 7.86 7.65 27.65 23.81 Voltage: 0.200 4.388 Temperatures: 8.14 7.91 27.87 24.06 Voltage: 0.199 4.370 Temperatures: 8.27 8.03 28.27 24.53 Voltage: 0.199 4.343 Temperatures: 7.39 7.94 28.54 23.97 Voltage: 0.198 4.299 Temperatures: 7.73 8.10 28.60 24.23 Voltage: 0.198 4.310 Temperatures: 8.06 8.25 28.59 24.17 Voltage: 0.198 4.275

Hi @Fausto I'll try to answer your question, in order below: The calibration from the factory are the ones shown in my examples, I did not change them. Temperatures 11.14 10.67 28.06 23.03: The 1st 2x Thermocouples are in the fridge, hanging, not in contact with any material (11.04C and 10.67C should read 3C and 2.5C) The 3rd Thermocouple is on the evaporator of a fridge, contact on metal (28.06 should read 20C) I tried removing it from the metal, same result. The 4th Thermocouple is an ambient temperature, hanging not in contact with any material (23.3C should read 16C) ==> So roughly the MC-134 reads 8C higher across all sensors All four are K-Type and I can read them OK with a multimeter connected to them, in place of the MCC-134 I cannot use the active cooler on the RPi5 as it would not fit under the hat Temperature from the DAQHat UI application are the same as read by the Python script My polling is every minute, and I just tried every 1s, results are the similar No pump or motor near the RPi Note that I did try the MCC-134 alone, without the MCC-128 on top and had the same issue. MCC-128 works fine.

Hello, I have a Raspberry5 and 2 MCC hats: MCC134 and MCC128. The MCC134 is connected with 4 K type thermocouple but it seems that all inputs are reading 9C higher than a multimeter would read from the same sensors. When I had the MC134 alone, temperatures seem in the expected range so it seems it might have started after I installed the MCC128, but when removing the MCC128, result are still high. Does the stock slope and offset makes sense here? Found MCC134 at address [HatInfo(address=0, id=323, version=1, product_name='MCC 134 Thermocouple Input HAT')] Channel 0 set to Type 1 Coefficient MCC134CalInfo(slope=0.9995942395331735, offset=-5.424700045439295) Channel 1 set to Type 1 Coefficient MCC134CalInfo(slope=0.9995924187283793, offset=-24.076377532285278) Channel 2 set to Type 1 Coefficient MCC134CalInfo(slope=0.9995927307750806, offset=-27.509583343136) Channel 3 set to Type 1 Coefficient MCC134CalInfo(slope=0.9995938139937812, offset=-22.98250636926832) Logging Interval (sec) 60 Logging temperatures, Ctrl-C to exit. Temperatures 11.14 10.67 28.06 23.03 CJC 26.7397420913332 26.367750118973106 25.348451403433273 24.073498502352948 ADC noscale nocal -67282.0 -67654.0 11855.0 -4457.0 Calibration Date 2023-12-27 Values from the Python script are the same than with the MCC utility. Not sure what I could do at this point? Thank you