H13-2C50-JLE datasheet(4/28 Pages) MAGNETROL

4 / 28 page

46-635 External Cage Displacer Actuated Liquid Level Switches

Figure 1

Figure 2

1.0

Introduction

Displacer actuated external cage liquid level switches are

designed for service pressures up to 5000 psig (345 bar)

and liquids with specific gravities of 0.40 and above.

1.1

Principle of Operation

The design of displacer operated level switches is based

upon the principle that a magnetic field will not be affected

by non-magnetic materials such as 316 stainless steel. In

this case, the displacer moves a magnetic attraction sleeve

within a non-magnetic enclosing tube and actuates a mag-

netic switch mechanism. The enclosing tube provides a

pressure seal to the chamber and therefore to the process.

1.2

Operating Cycle

The weight of the displacer

is supported by the spring.

Rising liquid level imparts buoyancy forces on the displacer

allowing the spring to compress. The attraction sleeve

attached to the spring, moves upward into the field of a

permanent magnet

. The movement of the magnet

toward the sleeve causes the switch

to actuate. A non-

magnetic barrier tube

provides a static pressure boundary

between the switch mechanism and the displacer assembly.

As the liquid level falls, the displacer lowers, moving the

attraction sleeve out of the magnetic field of the switch

mechanism. This allows the switch to again change position

and to break or make. See Figures 1 and 2.

2.0

Installation

Caution: If equipment is used in a manner not specified by manu-

facturer, protection provided by equipment may be

impaired

2.1

Unpacking

Unpack the instrument carefully. Inspect all units for

damage. Report any concealed damage to carrier within

24 hours. Check the contents of the packing slip and

purchase order. Check and record the serial number for

future reference when ordering parts.

2.2

Critical alarm function

It is recommended that for critical alarm functions, an

additional level switch be installed as a high–high or

low–low level alarm for maximum protection.

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