6
Commissioning
n
User qualification: trained user,
Chapter 1.2 ‘User qualification’ on page 49
CAUTION!
Incorrect metering due to sensor failure
Possible consequence: Slight or minor injuries. Material damage.
–
If a sensor fails then there may be an incorrect measured value at the input of the
measuring/control unit.
–
This incorrect measured value can lead to uncontrolled metering.
–
The operator should therefore ensure that no subsequent damage results from this.
CAUTION!
Incorrect metering due to premature ageing of the sensor
Possible consequence: Slight or minor injuries. Material damage.
Measure: Do not disconnect the sensor from the power supply during measuring breaks.
Exception: Electrically disconnect the sensor if there is a break between measurements
lasting more than a week and the proportion of disinfectant in the sample water falls during
this period to 0 ppm.
–
An extra run in period will be necessary following operation without disinfectant. Switch
on the feeder assembly with a time delay if necessary.
Run in period
The sensor requires a specific run in period to display a steady display value.
With initial commissioning:
2 ... 6 h
With re-commissioning:
1 ... 3 h
When replacing electrolyte or diaphragm:
0.5 h
* the exact run in period depends on the application.
Commissioning
62
