APG VBL Vibrating Switch user manual - Manual (Page 19)

Rev. A2, 9/09 VBL Series
19
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• If the voltage reading is high, the sensitivity adjustment is not properly set.
Adjust the sensitivity volume in the state of sensitivity setting switch is AJ
until the correct voltage can be read. Otherwise, the sensor is defective.
Consult APG for repair/replacement.
Maintenance
In order to use model VBL for a long time, maintenance is needed in periodic
intervals. Periodic inspections are important to maintain good service.
Maintenance method is as follow:
• A large amount of build-up on the tip of the vibration rod will cause wrong
signal output. Clean build-up in periodic intervals in case of measuring
strong adherence materials.
• Make sure the raindrops (waterdrops) are not intruding inside the housing.
For outdoor use, the waterdrops will intrude easily if the housing cover or
the cable entry is loose. Intrude of the waterdrops will cause an erroneous
signals, make sure to tighten periodically. A crack of water-drop-proof O-
ring (special article) between housing and cover will deteriorate the water-
drop-proof. Replace it with new ones.
• Depending on the measuring materials, the sensor will cause corrosion or
rubbing. Make sure the corrosion and rubbing are not outbreaking or
progressing periodically,