Instructions User guide

Veris Technologies

Pub. #OM MSP03-1

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

9 mm)