Campbell Scientific OBS500 Smart Turbidity Meter with ClearSensor Technology - Manual (Page 48)

OBS500 Smart Turbidity Meter with ClearSensor™ Technology
more sensitive, by factors of four to six, to mineral particles than particulate
organic matter, and interference from these materials can, therefore, be ignored
most of the time. One notable exception is where biological productivity is
high and sediment production from rivers and re-suspension is low. In such an
environment, OBS signals can come predominately from plankton.
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 OBS500 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.
Other than the sleeve and the biocide chamber on the
sensor tip, there are no user-serviceable parts inside
the sensor housing. Do not remove the sensor or
connector from the pressure housing. This will void the
warranty and could cause a leak.
Plastic (pn 27473) and copper (pn 27803) sleeves are available for the OBS500
to reduce required cleaning. The plastic sleeve is intended to be disposable.
The copper sleeve should slow fouling growth, but it may need to be cleaned.
If the sleeve becomes encrusted with organisms, such as barnacles or tube
worms, remove the sleeve. The sleeve can be soaked in weak acids or other
cleaning products that are compatible with copper. The sleeve may have to be
gently scraped with a flexible knife blade followed by a SkotchBrite scouring
pad.
Do not use solvents such as MEK, Toluene, Acetone, or
trichloroethylene on OBS sensors.
Downloading a New Operating System
DevConfig is used to download a new operating system to the OBS500. Select
the Send OS tab and follow the directions on the screen.
WARNING
WARNING
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