9.4.3. If the slope calibration does not
succeed
If the slope calibration cannot be done:
• because of the deviation of the measuring value from the DPD-
measurement. See chap. 9.4.2;
• and for other causes, do the following:
1. Check the correct operation of the electronics of the sensor.
See chap. 9.4.4.
2. Do a zero point check. See chap. 9.4.5.
3. Check the signal. See chap. 9.4.6.
4. If the three previous checks have been made and the problem
persists, do the additional checks listed in chap. 9.4.7.
9.4.4. Checking the correct operation of
the electronics of the sensor
1. Unscrew the membrane cap.
2. Thoroughly rinse the reference electrode and dry it carefully with
a clean towel.
3. Let the electrodes in contact with the air.
4. Connect the sensor to the remote controller type 8619 and wait
for 5 min.
5. Check the displays of the remote controller type 8619.
It must be:
- +/– 0 mV for the "trace" chlorine sensor (order code 565164)
or
- +/– 4 mA for the chlorine sensors (order codes 568524
1)
or
568523
2)
).
6. If the displayed value significantly deviates from either +/– 0 mV
or +/– 4 mA, send the sensor back to Bürkert.
7. If the displayed value is either +/– 0 mV or +/– 4 mA, the elec-
tronics of the sensor is correctly operating.
Check the zero point. See chap. 9.4.5.
1) or other chlorine sensor for operation at constant pH
2) or other chlorine sensor having a reduced pH-dependency
9.4.5. Checking the zero point of the
sensor
1. Prepare the sensor as described in chap. 7.3.
2. Connect the sensor to the remote controller type 8619.
3. Fill a beaker with clean tap water which does not contain
disinfectant.
4. Place the sensor into the beaker.
5. Stir for 30 seconds using the sensor in the beaker and make
sure there are no bubbles.
6. Leave the sensor in the beaker and wait until the polarization
time has elapsed. For the polarization time durations, see
chap. 8.
29
Maintenance and troubleshooting
Type 8232
english
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