7 Housing seal
8 Flat seal
9 Electronic assembly
NOTE: The cuvette needs to be fully dry before it can be inserted
into the sensor. If there is visible moisture on the cuvette or the
transducer, there is a great danger of damage to the sensor elec‐
tronics and the transducer. Fully clean and dry the cuvette before
inserting the cuvette into the sensor.
All the unit seals need to be maintained and the dessicant needs to
be in a good condition (no DESC display) for the drying system to
work properly.
NOTE: Certain routine maintenance works, such as calibration and
desiccant replacement, are triggered by internal diagnostic warn‐
ings. The time for other routine maintenance work, such as
removing the flow unit for manual cleaning of the cuvette, depends
on the use of the system and the water quality.
A3444
4
3
2
1
Fig. 50: Parts of the ultrasonic cleaning system
1 Sensor (top view)
2 Ultrasonic spring connectors
3 Ultrasonic transmitter
4 Flow cuvette
8.3 Cleaning the flow cuvette
Measuring cuvettes, which are used for sampling and also for the
flow unit, need to be clean and free of spots or scratches. We rec‐
ommend checking the cuvette every 3 months when performing
primary calibration and cleaning it, if necessary. The flow unit with
the measuring cuvette needs to be removed to perform calibration.
Cleaning is done by cleaning the inside and outside with a cleaning
solution and then rinsing several times with distilled or deionised
water.
The cuvette can be replaced by first interrupting the flow with the
shut-off clamp provided, unscrewing the old cuvette and replacing
it with a new, clean cuvette
Maintenance, troubleshooting and repair
60