815222302 datasheet(14/28 Pages) MAGNETROL

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

2.7.4 Wiring Notes and Definitions

1. Equipment controlled by the Kotron relays is assumed to

be powered from one source, while the Kotron unit itself is

assumed to be powered from a different source.

2. There is a fail-safe switch on the Kotron unit, which may

be set in either a HL or LL position.

3. “Fail” means a loss of power to the Kotron unit.

4. HL (high level) means a material level in the tank, which

is equal to or above:

a. The setting of a narrow differential point.

b. The higher setting of a wide differential point.

5. LL (low level) means a material level in the tank, which is

equal to or below:

a. The setting of a narrow differential point.

b. The lower setting of a wide differential point.

6. When the relay coil is de-energized (fail-safe), a connection

is made between common (COM) and the normally

closed (NC) and there is no connection between common

(COM) and the normally open (NO) terminals.

7. When the relay coil is energized, a connection is made

between the terminals COM and NO, and there is no

connection between CM and NC.

2.8

Calibration

Caution: When instrument calibration is to be done in a hazardous

location, extra steps and precautions must be taken.

Power must be turned off before housing cover is

removed from unit amplifier.

All pre-installation checks on the instrument should be

done in a non-hazardous area in order to minimize the

amount of work required on the unit after installation.

Instrument can be checked on the bench, preferably with

the process material, by temporarily connecting power and

performing the steps outlined in the calibration adjust-

ment instructions.

2.8.1 Level Range Selection

The preamplifier circuit board has a range jumper (JU1),

see Figure 9 on page 9. For remote units, this board is

located in the probe enclosure.

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