I'm measuring the temperature of a tank that is heated with a 6000 W heating element and cooled with a compressor, i measured the temp with a LM34 sensor with a 10 kohm resistor between the signal and ground (EI1034). I use a KYOTO 40 W SSR (KD20C40AX) to turn on and off the heating element and compressor. I have a Labjack U3-HV.
The problem is that every time the compressor turns on my temperature signal goes up about 0.3 °C and this deviation continues until the compressor turns off. And the same with the heating element but instead it goes down about 0.3 °C.
How can I avoid this deviation and what is causing it?
Thank you in advance.