80-5212-322 Datasheet, PDF (15/28 Pages) Magnetrol International, Inc. – RF Point Level Switches

The position of the jumper is dependent upon the fluid
being measured. Locate this jumper in the "LO" position
if the fluid is non-conductive (dielectric less than 10);
for conductive fluids, position this jumper in the "HI"
position.
For narrow differential units, always place the jumper in
the "LO" position.
2.8.2 Fail-safe Mode Selection
The fail-safe mode is selected for the particular level
detection application to provide for relay contact closure
upon any loss of electrical power.
To select the appropriate relay state, locate the small toggle
switch on upper right portion of circuit board and switch
to HL for high level mode or LL for low level mode. Refer
to Section 3.4, Terminal Connections on page 21.
2.8.2.1 High Level Mode
In this mode, an electrical power failure will de-energize
the relay causing the contacts to assume a position as if
product level were at or above the set point.
2.8.2.2 Low Level Mode
In this mode, an electrical power failure will de-energize
the relay causing the contacts to assume a position as if
product level were at or below the set point.
2.8.3 Calibration Adjustments
Adjustments should be performed with unit under actual
operating temperature and pressure conditions. Zero and
span adjustments are located at upper left on amplifier cir-
cuit board. A level range select jumper is also provided. It
is located on the preamplifier board of single point integral
units and all remote units. Be sure that the proper range
has been selected. Refer to Section 2.8.1, Level Range
Selection on previous page.
2.8.4 Zero Adjustment
1. With the probe installed in the vessel and the process
material at or below the desired set point, turn ZERO
adjustment potentiometer on the left hand side of the
printed circuit assembly clockwise (CW) a minimum of
twenty full turns or until a clicking sound is detected.
NOTE: Be sure Fail-safe Mode Selection has been set correctly. Refer
to Fail-safe Mode Selection above and Relay Wiring Chart on
page 10.
50-605 Kotron RF Point Model 80/81 Level Switches
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