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o
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8.8.2.3
DULCOTEST
®
CTE Sensor for Total Chlorine, Running-In
CAUTION
• The power supply to the measuring device and to the sensor must not be interrupted. If
the power supply is interrupted (> 2 hours) the sensor must be re-commis sioned.
• Do not switch off the measuring system during interval operation. After any operation
without chlorine, running-in periods must be reckoned with. If required, switch on
metering unit time-delayed! If no chlorine is metered for a longer period of time (weeks),
the sensor must be disconnected from the power supply and stored dry.
• The sensor’s current signal must not exceed 20 mA. Otherwise the sensor may be
damaged, which may result in dangerous overdosing within a control system.
To avoid this, install a monitor, which permanently switches off the chlorine control
system and triggers an alarm. The monitoring equipment must not be automatically
re-setting.
• Once the sensor has been commissioned it must be kept permanently wet.
After completed installation the controller can be switched on. The system should then be
allowed to run in for the set run-in period.
Running-In
Period
In order to achieve a stable display value the sensor should be run in for the following run in
periods.
First commissioning:
24 hour
After changing membrane: 1-6 h
Re-commissioning:
approx. 4-24 hours
8.8.2.4
DULCOTEST
®
CTE Sensor for Total Chlorine, Calibration
IMPORTANT
The
specifi ed calibration method depending on the type of chlorination agent used must
be observed.
CAUTION
• Carry out a slope test every time the membrane or electrolyte is changed.
• Avoid air-bubbles in the sample fl ow. They can attach at the membrane, which may
cause too low measured values. Within a control system this may lead to dangerous
over dosing.
• For proper function of the sensor, the slope test has to be repeated regularly.
• If installing the sensor outside Germany, please comply with the local regulations for
calibration intervals.
Preconditions
The sensor reading is stable (no drifts or unsteady values for at least 5 minutes). This is normally
fulfi lled, when
• The system has been allowed to run-in for the specifi ed period
•
The
fl ow through the in-line probe housing is constant and corresponds with the technical
data
• The sample medium and the sensor are at the same temperature
• The pH value is constant and within the admissible range (pH 6.5 - 9.5)
Zero Point Calibration
Zero point calibration is necessary only when the sensor is used at the lower limit of the
meas ur ing range.
Remove the sensor from the DLG III or DGM in-line probe housing (see DLG III, DGM opera-
ting instructions)
Immerse the sensor in a container with clean water, free of chlorine and bromine.
Stir by using the sensor, until the measured value remains stable.
Adjust the controller (DULCOMETER
®
D1C, chlorine) to zero, according to it‘s operating
instructions (DULCOMETER
®
D1C, chlorine Operating Instructions: Chapter 8, complete
operating menu, settings menu “Calibrating chlorine zero point”)
Reinstall the sensor into the in-line probe housing (DGM, DLG III)
Total Chlorine
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