815222302 datasheet(15/28 Pages) MAGNETROL

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50-605 Kotron RF Point Model 80/81 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.

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