80-5212-322 Datasheet, PDF (20/28 Pages) Magnetrol International, Inc. – RF Point Level Switches

3.1.2.2 Wide differential point units
1. Turn off the power to the unit.
2. Remove the lead wire from the probe.
3. Turn the zero and span potentiometers fully clockwise.
NOTE: On wide differential units, the zero potentiometer is located
above the span potentiometer.
4. Move the probe level range jumper to the HI position
board. Refer to Figure 9 on page 9.
a. When the probe range jumper (switch) is in the HI
position, a low level is simulated. When it is in the LO
position, a high level is simulated.
b. On remote mounted units, this jumper is located inside
the probe housing on the probe preamplifier board.
Refer to Figure 9 on page 9.
6. Turn on power to the unit.
7. The red LED will be on. Turn the zero potentiometer
fully counterclockwise. Refer to Figure 10 on page 19.
8. Move the probe range jumper (switch) to the low level
position. Refer to Figure 12 on page 20. The LED will
turn off. If not, turn the span potentiometer slowly coun-
terclockwise until the LED turns off. Refer to Figure 10
on page 19.
9. The LED should now turn on and off with movement of
the jumper (switch).
10. The probe range jumper (switch) can now be switched
between the HI and LO positions and the LEDs will go
on and off. The relays will also go on and off accordingly.
If your unit operates as described above, the probe pream-
plifier board, the probe preamplifier cable and amplifier
are functioning correctly.
If your unit does NOT operate as described above, it is
malfunctioning. Perform the following checks:
1. Take DC voltage reading across probe preamplifier
terminals – should be approximately 12 VDC.
2. Take AC voltage reading across probe preamplifier
terminals – should be .1 to .2 VAC.
3. Consult factory – have test data available for discussion.
NOTE: These values can also be taken at probe preamplifier
wiring terminals on remote installations.
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50-605 Kotron RF Point Model 80/81 Level Switches