Apr Limit Switch; Introduction; Operation; Switching Point Adjustment - Tecfluid Series LT Instruction Manual

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APR LIMIT SWITCH

12.1

Introduction

The APR limit switch can be used to generate an alarm or an operation when the level that
the instrument is measuring reaches a preset value. It is a bi–stable SPDT limit switch.
It consists of a reed sensor that is actuated by the magnetic field of the float.
12.2

Operation

When the float passes through the point where the limit switch is positioned, it changes the
state of the reed sensor, and therefore the output state. This is maintained until the float
passes in the opposite direction by the point where the switch is, returning again to the
previous state.
12.3

Switching point adjustment

12.3.1 LT models

To fix the limit switch on the level gauge, completely loosen the clamp (D) and open it. With
the clamp open, place the limit switch in the body of the level indicator and close the clamp
on the tube.
Place the level switch at the desired level and tighten the clamp.
The position of the reading point of the float with respect to the switching point of the limit
switch can vary from one type of float to another. If it is the first time that the switching point
is adjusted, with the float in a stable position, move the limit switch until the reed sensor
switches.
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D