815222302 datasheet(16/28 Pages) MAGNETROL

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

2. Set the fail-safe mode for the alarm relays:

a. In low level fail-safe mode, the alarm relay will be

de-energized when the material level is BELOW the

alarm set point.

b. In high level fail-safe mode, the alarm relay will be

de-energized when the material level is ABOVE the

alarm set point.

3. Energize the instrument. The calibrate LEDs will be on

regardless of the settings of the fail-safe switches or time

delay setting. Relays set in the low level fail-safe (LLFS)

mode will be energized and there will be continuity

between the common (CM) and normally open (NO)

relay terminations. This can be checked with an ohmmeter

or other suitable continuity checking device. Relays set in

the high level fail-safe (HLFS) mode will be de-energized

and there will be continuity between the common (CM)

and normally closed (NC) relay terminations.

4. If the vessel is not filled to the desired set point, increase

level of material to the required set point.

5. Turn the zero adjustment counterclockwise (CCW) until

LED indicator goes off (the relay will change state), then

turn the control slowly in the CW direction until the LED

indicator again comes on. Repeat this on–off procedure

several times and leave the LED indicator on. The narrow

differential alarm point is now calibrated.

2.8.5 Zero and Span Adjustment

2.8.5.1 Wide Differential — Vertical Probe Mount Only

1. With the probe installed in the vessel and the process

material at the desired low level, turn both the zero and

span adjustment on the left hand side of the printed

circuit board clockwise a minimum of twenty full turns or

until a clicking sound is detected. If the process material is

not at this point, the material level must be changed until

this point is reached.

2. Set the fail-safe mode for the relay: (Be sure Fail-safe

Mode Selection has been set correctly).

a. In low level fail-safe (LLFS) mode, relay is de-energized

on rising level and remains de-energized until upper

span point is reached.

b. In high level fail-safe (HLFS) mode, relay is

de-energized on falling level and remains de-energized

until lower zero point is reached.

3. Energize the instrument. The calibrate LED will be on

regardless of the position of the fail-safe switch.

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