Pr
o
Minent
®
26
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.
왘
Immerse the sensor in a container of clean, ozone, chlorine and ClO
2
-free
water.
왘
Stir with the sensor until the measured variable displayed at the
controller has remained stable for 5 min.
왘
Calibrate the controller to zero in accordance with the operating
instructions.
왘
Reinstall the sensor in the in-line probe housing assembly.
Slope test
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
2
concentra-
tion remains constant).
Since ClO
2
breaks down rapidly it is important that the
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.
왘
Determine the chlorine dioxide content in the sample water using an
appropriate measurement device (e.g. Photometer DT 1).
왘
Enter the resulting value into the controller in accordance with the
operating instructions.
Repeat calibration after 1 day.
Operation
BA_DT_099_10_08_4spr.p65
13.10.2008, 10:39 Uhr
26