Campbell Scientific OBS500 Smart Turbidity Meter with ClearSensor Technology - Manual (Page 41)

OBS500 Smart Turbidity Meter with ClearSensor™ Technology
the current usage. Therefore, increased current usage indicates that the
wiper needs to be cleaned (see step 2).
4. Mount the sensor between 45 degrees pointing down to vertical hanging
down.
7.7.1 Wiper Removal Procedure
1. Remove the stop screw in the OBS500 housing at the end of the
shutter/wiper slot.
2. Remove the 4-40 flat head screw and copper plate to expose the drive shaft
access port (FIGURE 7-9).
3. Insert a slot screw driver (2.5 mm (0.1 in.) wide blade) into the access port
(FIGURE 7-10).
4. Engage the end of the drive shaft and then rotate clockwise until the
shutter is free (FIGURE 7-10 and FIGURE 7-11).
Keep track of all of the components (FIGURE 7-12).
5. Reassemble by reversing the steps.
FIGURE 7-9. Remove the screw
CAUTION
Remove 4-40
flat head screw
Copper plate
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