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< 4. Maintenance >
4-2
IM 19H1D2-01E
4.2 Inspecting the Cleaning Device
The following information concerns only the submersion type holder with jet washing device.
SEE ALSO
For maintenance of the MLSS sensor with wiper-washing, refer to the MLSS sensor's mamual.
Make the following inspections of the device.
1. Check the nozzle of the jet washing device for clogging.
2. With the solenoid valve closed, check whether or not the washing utility is discharged.
If no error can be found in the device when it is installed, remove the submersion type holder and
inspect again.
4.2.1 Inspecting Jet Washing Device
When the nozzle is clogged, the cleaning effect of the jet washing device will decrease.
Use a 0.8 mm thick metal needle or the like to unclog the nozzle.
Remove the jet washing device from the holder to inspect the interior of the washing device. If
excessively dirty with slurry or algae, clean thoroughly.
Figure 4.2 Unclogging the Nozzle
4.2.2 Inspecting Solenoid Valve
Check that the cleaning utility is not discharged from the jet washing device while the solenoid
valve is closed.
Replace the solenoid valve if the leak is more than a smal1 amount that does not affect
measurement.