815222302 datasheet(19/28 Pages) MAGNETROL

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50-605 Kotron RF Point Model 80/81 Level Switches

Caution: This procedure changes any previous calibration of the

amplifier. If the unit checks out as operational, it will have

to be recalibrated before being used in the process.

3.1.2.1 Narrow differential point units

1. Turn off the power to the unit.

2. Remove the leadwire from the probe.

3. Turn the setpoint potentiometers fully counterclockwise.

4. Turn all time delay potentiometers fully counterclockwise.

5. Move the probe level range jumper to the HI position.

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.

6. Turn on power to the unit.

7. The red LEDs will be off. Adjust the narrow differential

point potentiometer(s) counterclockwise until the LED(s)

turn on. Then slowly adjust each potentiometer clockwise

until the LED turns off.

8. 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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