I have a 4 pole conductivity probe with 4 wires and a shield, also a 3 wire pt 100 temperature sensor. When connected to the CN0359 they both work.
The probe, for a test, is placed in a NaCl 0.9% solution, there are no changes in the fluid. After a short time the value from the conductivity probe goes up rapidly and than the CN0359 gives the "Sensor Incorrect!" error. When I reset the CN0359 (power off and on again) the value resets and again after a short time the value rises, with the error as a result.
It looks like somewhere there is a voltage build up which causes the given conductivity to go up. I am not certain whether the probe or the CN0359 eval board is the cause of the problem. So my question to all the readers is: Has anyone else experienced this or has anyone have an idea what causes this?
Excitation Voltage is set to 200 mV
Excitation Frequency is set to 1.0 kHz
Temperature Coefficient is set to +1.00% per deg. C
Cell Constant is set to 1.00/cm (this value might not match the probe, but other settings have the same result)