Amd Limit Switch; Introduction; Operation - Tecfluid M21 Series Instruction Manual

AMD LIMIT SWITCH

7

INTRODUCTION

The AMD limit switch can be used to generate an alarm or an operation when the flow rate
that the instrument is measuring reaches a preset value on the scale plate.
The AMD limit switch consists of a NAMUR slot type inductive sensor, that is actuated by a
vane. Given that there is no physical contact in the operation, the limit switch has no influence
on the indicator needle movement.
An instrument can be equipped with one or two sensors, depending on the number of points
to be detected. A NAMUR amplifier with a relay output can be supplied as an option.
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OPERATION

The indicator needle moves together with the vane mounted on its shaft. When the vane
enters into the slot of the sensor, the limit switch changes its state.
The sensor is mounted on a support which includes a needle that indicates the switching
position. The needle, that is below the scale plate, can be seen through the scale slot.
Switching
points
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