Pr
o
Minent
®
Page 109
pH/Chlorine
Running-In
DULCOTEST
®
sensor PHEP or PHER for pH
The
DULCOTEST
®
PHEP or PHER sensor for pH must not be run-in. The DULCOTEST
®
PHEP or
PHER sensor for pH can be readily used.
8.9.2.4
DULCOTEST
®
CTE Sensor for Total Chlorine and DULCOTEST
®
Sensor
PHEP or PHER for pH, Calibration
Calibration
DULCOTEST
®
CTE sensor for total chlorine
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)
Slope
Test
Insert the sensor into the DLG III or DGM in-line probe housing, if not already done.
Take a water sample for DPD-measurement. Sampling location has to be close to the installed
sensor. Recommendation: use the sampling tap in the case of the DGM in-line probe housing.
Determine total chlorine content with an appropriate chlorine measurement kit according to
the DPD-4 method (e.g. Photometer DT1, order no. 1003473).
Input the measured value into the controller according to it‘s operating manual
( DULCOMETER
®
D1C, chlorine Operating Instructions: Chapter 8, complete operating menu,
settings menu “Calibrating chlorine”
After initial installation of the sensor, check the calibration by DPD-measurement 24 hours later.
The following maintenance intervals based on experiences are recommended
•
Potable, industrial, process
and cooling water:
depending on the specifi c conditions (1-4 weeks)
• Swimming pools:
weekly
• Spa pools (whirlpools):
daily
BA_DR_002_02_09_GB_Cooling.indd 109
BA_DR_002_02_09_GB_Cooling.indd 109
24.02.2009 11:56:10 Uhr
24.02.2009 11:56:10 Uhr