Veris Technologies MSP EC and pH (1997-2008 floppy disk drive 1.02E) - Operating Instructions - Manual (Page 62)

Veris Technologies
Pub. #OM MSP03-1
62
Figure 2. Prox sensor gap
3. Adjust prox sensor height if needed. Loosen bolt holding prox sensor arm and rotate to
change height of prox sensor (Figure 3). Adjust prox sensor height with sampler shoe
completely raised. Adjust the prox sensor so it barely clears the lower part of the sensor plate
when sampler is completely raised. It may be necessary to reposition the electrode holder
and/or sampler shoe after adjusting prox sensor. If sampler shoe is unable to penetrate hard
soil, the prox sensor may not be able to clear the top of the plate. If that happens, the
sampler will appear to have locked in the down position—when in reality it just isn’t able to
clear the metal plate. In that case, the external controller has not received the message from
the prox sensor to move to the next step in the sequence—raising the shoe for pH
measurement.
Figure 3. Pivot bolt for adjusting prox sensor arm
4. Check voltage to prox sensor if needed. Disconnect sure-seal connector from external
controller to prox sensor. Check for 12V voltage on socket #1 and pin #3 from external
controller, with power to external controller turned on (Figure 4). Do not short across
voltmeter leads.
Figure 4. Checking voltage to prox sensor
1/4 to 3/8” gap
(6-9 mm)