ProMinent DULCOTEST Mode D'emploi page 28

Operation
Preconditions • Constant flow through in-line probe housing (see 15 "Technical Data")
• Constant sample water temperature
• Similar sample water and sensor temperatures (wait approx. 15 min.)
• The sensor has been run in
• Constant pH value
Zero point calibration
If a ProMinent controller is being used to operate the sensor, zero point
calibration is not usually necessary. Zero point calibration should be carried
out, however, if operating the sensor at the lower measurement threshold or
when using the 0.5 ppm variant.
S Immerse the sensor in a container of clean, chlorine-free tap water.
S Stir with the sensor until the measured variable displayed at the controller
has remained stable for 5 min.
S Calibrate the controller to zero in accordance with the operating
instructions.
S Reinstall the probe in the probe housing (DGM; DLG) as described in
section 6 "Installation".
Slope test
S Determine the chlorine content in the sample water using an appropriate
measurement system (e.g. DPD-1).
S Set the resulting value at the controller in accordance with the operating
instructions.
Repeat calibration after 1 day!
28 ProMinent ®