ProMinent DULCOTEST CDP 1 1-mA-2 ppm Mode D'emploi page 26

Operation
Zero point calibration
If a ProMinent controller is being used to operate the sensor, zero point
calibration is only usually necessary the first time the equipment is
commissioned. Zero point calibration should be carried out, however, if
operating the sensor in the lower measurement range.
Slope test
Repeat calibration after 1 day.
26
Immerse the sensor in a container of clean, ozone, chlorine and ClO
water.
Stir with the sensor until the measured variable displayed at the
controller has remained stable for 5 min.
Calibrate the controller to zero in accordance with the operating
instructions.
Reinstall the sensor in the in-line probe housing assembly.
NOTE
For bottle washing machines, carry out calibration only
after a relatively long period of trouble-free operation or if
the bottle washing machine is left to stand (ClO
tion remains constant).
Since ClO
2
sensor is calibrated equally rapidly. If a mobile measuring
device is not available, please observe the following:
Carry out the reaction of the sample water with the DPD-1
reagent directly at the bottle washing machine: then send
the probe to the laboratory as fast as possible for
measuring.
Determine the chlorine dioxide content in the sample water using an
appropriate measurement device (e.g. Photometer DT 1).
Enter the resulting value into the controller in accordance with the
operating instructions.
breaks down rapidly it is important that the
-free
2
concentra-
2
ProMinent
®