APG VBL Vibrating Switch user manual - Manual (Page 18)

VBL Series Rev. A2, 9/09
18
Automation Products Group, Inc.
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• Maintenance
In general, the sensitivity properly set VBL needs no maintenance. But in
order to use the sensor stable for a long time, maintenance and inspection are
needed in periodic intervals.
Inspection
Inspection is held to examine
• If the sensitivity is set to proper sensitivity.
• If it is affected by the build-up.
• If the sensor is operating correctly.
Proceed as follow:
• Make sure the measuring materials are not touching the vibrating pipe.
Replace the sensor out of the tank if necessary.
• Supply power to the sensor.
• Make sure which the sensor sensitivity is set. Super-high, high, standard
(shipping sensitivity) or low.
• Prepare the 0 ~ 10 VDC range voltmeter.
• Plug the voltmeter leads to the test points, positive to Red (+) and negative
to Black (-).
• See the table below. Ensure both A and B stated voltage can be read for
each set sensitivity.
Position for Sensitivity Setting
Switch and Voltage Reading
Set Sensitivity A B
Super-high H: 8 ~ 9 V AJ: 4.5 ~ 5.5 V
High L: 8 ~ 9 V AJ: 2.0 ~ 3.0 V
Standard L: 8 ~ 9 V AJ: 4.5 ~ 5.5 V
Low L: 8 ~ 9 V AJ: 6.0 ~ 7.0 V
• If the voltage reading is accomplished, the sensitivity adjustment is correct.
Nevertheless malfunction occurs. See Troubleshooting section.
• If the voltage reading is low, clean up the build-up on the vibration rod.
Then 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.