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7.6
Backflow preventer maintenance
Close the shut-off valve.
Vent the backflow preventer. If no flowing noises occur after venting, maintenance work must be carried out on the back-
flow preventer. Carry out the maintenance of the backflow preventer as follows.
Undo the hexagon screws on the flange.
Open the one-handed closure.
Remove the backflow preventer.
Remove blockages and/or blocking objects.
Clean the backflow preventer in the water bath.
The shut-off valve must be replaced if it is difficult to close or open, even after multiple operation.
7.7
Sensor system maintenance
Dismantle and clean the sensor parts
Dismantle and clean the optical probes
Check the function of all optical probes, if installed
Reinstall the sensors
7.8
Immersion pipe maintenance
Unlock the locking lever
Remove the immersion pipe
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and clean it
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Installation and operating instructions
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