Hi,

I have two digital temp sensors, the second connected via the PH/Temp expansion card directly into the Profilux.

Initial, when first installed, both sensors were giving consistent readings, only +/- 0.1 difference.
However after a number of hours sitting in water, the two numbers have been drifting apart significantly.

Probe 1 is naturally dropping in temperature (23.9C), as the water has no heater attached. Probe 2 however is increasing in temperature (28.2C)

I suspected it may be a probe issue, so I disconnected everything and swapped them over.
To my surprise, I get the exact same reading.

Both probes give exactly the same reading in either port, so this discounts the issue being with the probes themselves.

I have tested the water temp with a 3rd party tester and the probe connected to port 1 on the profilux is accurate, port 2 from the expansion card is always not correct.

Any thoughts?

Many thanks,
Dave