Maintenance
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61
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8.2 General inspection & cleaning routines
Make sure that the sensors and measuring chambers are clean. Follow the
planned maintenance program.
If a sensor measurement is static or seems unrealistic, or if its response
time is slow, then the sensor and measuring chamber may need to be
cleaned.
Any spilled water or water that has leaked onto surfaces must be wiped up
immediately. The source of the leak must be found, and the leak repaired.
Sensor readings must also be validated. Follow the planned maintenance
program.
The strainers must be inspected and cleaned. We recommend that the
strainers are checked every week or more frequently. Make sure to integrate
the checking of strainers in the planned maintenance program that has
been adapted to suit your system requirements and conditions.
8.2.1 PAH
NOTICE
Exercise caution when cleaning to avoid damaging optical windows.
The PAH sensor is generally kept clean by the flow of water in the
measuring chamber. If manual cleaning is needed, use water, soap, and a
clean cloth to clean both the sensor and measuring chamber.
8.2.2 Turbidity
NOTICE
Exercise caution when cleaning to avoid damaging optical windows.
The turbidity sensor is equipped with a wiper unit that removes fouling from
the optical parts. The flow of water through the chamber removes most
solids and keeps them from settling. To clean the sensor manually, close
the inlet and outlet valve, remove the wiper unit and clean the sensor inside
using water, soap and a cloth. Flush away any deposits by opening the drain
valve and pour clean water into the turbidity measuring chamber. Close
drain valve again and open inlet and outlet valve.
