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o
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7
Operation
IMPORTANT
Do not switch off the measuring system during interval
operation! After operation without chlorine dioxide,
running-in periods are to be rockoned with. If required,
switch on metering unit time-delayed! If no chlorine dioxide
is metered for a longer period of time, the sensor must be
disconnected from the power supply and stored dry.
7.1
Run-in Period
The sensor requires a run-in period before it will display stable readings.
First commissioning:
4 - 12 h
Re-commissioning:
2 - 4 h
Membrane-/electrolyte replacement:
approx 1 h
7.2
Calibration
The sensor can be calibrated after the run-in period.
IMPORTANT
•
A slope test must be carried out after replacing the
membrane cap or electrolyte.
•
Slope tests must be carried out at regular intervals to
ensure correct functioning of the sensor. When used in
bottle washing machines it may be necessary to re-
calibrate the sensor every week or even more frequently.
•
Avoid incorrect dosing due to air bubbles in the sample
water. Air bubbles clinging to the sensor membrane can
result in a measured variable that is too low and thus
lead to incorrect dosage.
•
Observe applicable national directives for calibration
intervals.
Preconditions
•
The sensor has been run in (see 7.1 “Run-in Period”)
•
Constant flow through in-line probe housing assembly
(see 15 “Technical Data”)
•
Constant sample water temperature
•
Similar sample water and sensor temperatures (wait approx. 15 min.)
Operation
BA_DT_099_10_08_4spr.p65
13.10.2008, 10:39 Uhr
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