Tecfluid AMD DP User Manual

Limit switches
AMD & AMM

instrumentation

for fluids

For Series

SC / SM / DP / LP

Instructions manual

R-MI-AMDAMMSC/DP Rev.: 0 English version

TABLE OF CONTENTS

LIMIT SWITCH AMD

1 INTRODUCTION ..................................................................................... 3

2 OPERATION ........................................................................................... 3

3 SWITCHING POINT ADJUSTMENT ...................................................... 3

4 ELECTRICAL CONNECTION ….......................................………........... 3

5 MAINTENANCE ...................................................................................... 4

6 TECHNICAL CHARACTERISTICS ........................................................ 5

7 SAFETY CHARACTERISTICS .........................................………........... 5

LIMIT SWITCH AMM

1 INTRODUCTION ..................................................................................... 6

2 SWITCHING POINT ADJUSTMENT ...................................................... 6

3 ELECTRICAL CONNECTION ……...................................………........... 7

4 TECHNICAL CHARACTERISTICS ........................................................ 7

2

LIMIT SWITCH AMD

1 INTRODUCTION

The AMD limit switch can be used to generate an alarm or an operation when the flow rate
or the level 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.

2 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

3 SWITCHING POINT ADJUSTMENT

To gain access to the limit switch inside the indicator housing, remove the front cover held
by four M5 x 16 DIN 912 screws, using a 4 mm Allen key. The circular fixing nuts of the
switching point are in the rear part of the indicator needle.

To move the limit switch needle, the circular fixing nuts have to be slightly loosen by
turning them to the left, without removing the scale plate (see the figure on the next page).
After that, place the limit switch needle in the required scale value, and fix it again with the
screw.

As standard, when the instrument has only one AMD, it comes configured as a minimum
limit switch.

4 ELECTRICAL CONNECTION

To gain access to the electrical terminal block, the scale plate must be removed. To do
this, slide it to the left by the guide until it be free.

3