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8.3.3 ORP value
1. Prepare a glass jar with ORP buffer solution.
2. Prepare an empty 10-litre bucket.
3. Press [Cal] > "ORP > cal. meas. value".
4. Shut off the water supply of the measuring cell.
5. Remove the ORP electrode from the measuring cell. Use the
bucket to catch any water that flows out.
6. Immerse the ORP electrode in the glass jar.
7. Enter the mV value of the ORP buffer solution.
The ORP calibration is finished and the result is displayed:
Finishing ORP calibration
1. Remove the ORP electrode from the buffer solution. Rinse the
ORP electrode with water.
2. Put the ORP electrode back into the measuring cell.
3. Open the water supply of the measuring cell.
4. Dispose of the buffer solution.
8.3.4 Logbook
The last ten calibration results are saved in the calibration
logbook. Example: View the last ClO
2
calibration results:
"main menu > monitoring > measurement > ClO2 > cal. logbook"
8.3.5 Interval
A calibration interval between 1 and 100 days can be set.
Example: calibration interval for the ClO
2
value.
1. Press [Cal] > "ClO2 > cal. cycle > on".
2. Enter the interval in days.
8.4 Changing the chemical containers
The chemical containers should be replaced in the following
situations:
• As soon as possible after the low-level signal is displayed.
• Immediately after the empty signal is displayed.
1. Untwist the screw cap from the suction lance in the chemical
container.
2. Carefully pull the suction lance out of the container, and
immediately insert it into the drip pipe in the collecting tray.
3. Screw the original cover onto the empty container.
4. Unscrew the cover of the new container. Retain the cover.
5. Insert the suction lance. Fasten the screw cap.
6. As soon as the suction lance is inserted, the production starts
up. The alarm message confirms automatically.
7. Reset the chemical consumption counter ("operation >
change container > HCl/NaClO2").
cal. meas. value
225 mV
cal. result
ORP offset
-2 mV
number . . . . . . . . . . . . . 1/10
date...................2014-07-31
time........................12:34:41
slope.............. 22.0 µA/ppm
Warning
Risk of serious personal injury and damage to
equipment due to incorrect handling of chemicals.
Before starting work, put on protective clothing:
gloves, face mask, protective apron.
Warning
Risk of poisoning from ClO
2
gas.
Risk of explosion when mixing NaClO
2
, and HCl.
Do not put the suction lances into the same bucket.
Do not insert the suction lances in the wrong
container.
OCD-162-5, -10: Make sure that the chemical
containers are positioned under the system.
Observe the labels on chemical containers, suction
lances and pumps:
red = HCl
blue = NaClO
2
Warning
Risk of burns from drips when removing the suction
lance from the chemical container.
Do not allow drips to fall on the skin, clothing, shoes
or ground.
Rinse away any drips on the container or in the
collecting tray with water immediately.
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