G3F-PB80-JGF datasheet(4/36 Pages) MAGNETROL

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46-624 Series 3 Liquid Level Switches ASME B31.1 Construction

Swing in

position

Switch

Return spring

Enclosing tube

(non-magnetic)

Attraction

sleeve

Magnet

1.0

Introduction

Magnetrol's Series 3 level switches are float operated units

suitable for use on clean liquid applications for level alarm,

pump control and safety shutdown functions. Units are

designed, fabricated and certified to compliance with

ASME B31.1 specifications.

1.1 Principle of Operation

The design of Magnetrol float-operated level switches is

based upon the principle that a magnetic field will pene-

trate non-magnetic materials such as 316 stainless steel.

The float moves a magnetic attraction sleeve within a non-

magnetic enclosing tube and actuates a switch mechanism.

The enclosing tube provides a pressure seal to the chamber

and therefore to the process.

1.2 Operating Cycle

As the liquid level rises in the chamber (refer to Figure 1),

the float moves the magnetic attraction sleeve up within

the enclosing tube and into the field of the switch mecha-

nism magnet. As a result, the magnet is drawn in tightly

to the enclosing tube causing the switch to trip, “making”

or “breaking” an electrical circuit. As the liquid level falls,

the float drops and moves the attraction sleeve out of the

magnetic field, releasing the switch at a predetermined

“low level” (refer to Figure 2). The tension spring ensures

the return of the switch in a snap action.

2.0

Installation

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 numbers and

model numbers for future reference when ordering parts.

Serial # _____________________________________

Model # _____________________________________

Figure 1

Switch Tripped

Swing out

position

Figure 2

Switch Released

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