Troubleshooting
TARAtec 9/10
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8.2.3
Checking the zero point
The electronics must have been tested and found to be OK.
Prepare the sensor (see section 4.2, p. 16).
Connect the sensor to the measuring and control device.
Fill a glass beaker with mains water (without any disinfectant!).
Stir the sensor round in the glass beaker for 30 seconds.
Carefully put the sensor down obliquely in the glass beaker.
Wait 30 minutes.
Read the measured value.
If the measured value is close to the value 0, the zero point can
provisionally be regarded as OK.
If the measured value deviates significantly from zero:
Perform maintenance on the sensor (see section 7, p. 26) and repeat
the zero point test.
A freshly cleaned working electrode has a relatively high zero point.
The sensor takes a few days to settle back to its lowest zero point.
If after maintenance has been performed on the sensor measured value
is not close to zero:
Return the sensor to the supplier for checking.
This completes the zero point checking.
