OBS501 Smart Turbidity Meter with ClearSensor
®
Technology
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FIGURE 8-8. Shutter disassembled
FIGURE 8-9. Shutter components
9. Maintenance
There is a biocide chamber in the slider that is refillable. The default biocide
from the factory is copper braid. The braid will last for many years, but it can
be replaced as desired. Other solid biocides can be placed in the chamber. To
be effective over time, the biocide should be slow to dissolve.
The OBS501 should be sent in for service (seal, shaft, and nut replacement)
after 2 years or 70,000 cycles of the shutter, whichever occurs first. The sensor
has a cycle count and a moisture alarm in the data string (SDI-12 and RS-232
only). If the seals are not replaced, the sensor will eventually leak and
potentially be destroyed. It is recommended that the cycles and moisture alarm
be recorded regularly. If a moisture alarm is recorded, the sensor shutter should
be parked and the sensor taken out of the water and returned for repair as soon
as possible.
Shutter
copper plate
Floating nut
spacer
Floating
nut
