2

T E C H N O L O G Y

B40 level switches employ permanent magnetic force as

the only link between the float and the switching element.

As the pivoted float follows liquid level changes, it moves

a magnetic sleeve

Œ

into or out of the field of a switch

actuating magnet



causing switch operation. A non-

magnetic barrier tube

Ž

effectively isolates the switch

mechanism from the controlled liquid.

Snap

Switch

Pivots

TensionSpring

Swing-InPosition

Float

1

2

3

Pivot

A G E N C Y

A P P R O V A L S

Œ

IEC Installation Instructions:

The cable entry and closing devices shall be Ex d certified suitable for the conditions of use

and correctly installed.

For ambient temperatures above +55° C or for process temperatures above +150° C, suitable

heat resistant cables shall be used.

Heat extensions (between process connection and housing) shall never be insulated.

Special conditions for safe use:

When the equipment is installed in process temperatures higher than +85° C the temperature

classification must be reduced according to the following table as per IEC60079-0.

AGENCY

APPROVED MODEL

APPROVAL CLASSES

FM

All with an electric switch mechanism and a housing

Class

I, Div 1, Groups C & D

listed as Type 4X/7/9

Class

II, Div 1, Groups E, F & G

All with an electric switch mechanism and a housing

Class

I, Div 1, Groups B, C & D

listed as Type 4X/7/9 Class

I, Div 1, Group B

Class

II, Div 1, Groups E, F & G

CSA

All with a Series F, HS, 8 or 9 electric switch mechanism

Class

I, Div 2, Groups B, C & D

and a housing listed as CSA Type 4X

All with an electric switch mechanism and a housing

Class

I, Div 1, Groups C & D

listed as Type 4X/7/9

Class

II, Div 1, Groups E, F & G

All with an electric switch mechanism and a housing

Class

I, Div 1, Groups B, C & D

listed as Type 4X/7/9 Class

I, Div 1, Group B

Class

II, Div 1, Groups E, F & G

ATEX / IEC Ex

Œ

All with an electric switch mechanism and an

ATEX

II 2 G EEx d IIC T6

ATEX housing

94/9/EC

IEC Ex Ex d

IIC T6

CE

Low Voltage Directive 2006/95/EC

Installation Category

II

Per Harmonized Standard:

Pollution Degree 2

EN 61010-1/1993 & Amendment No. 1

Maximum Process

Temperature

Temperature

Classification

< 85° C

T6

< 100° C

T5

< 135° C

T4

< 200° C

T3

< 300° C

T2

< 450° C

T1

These units are in conformity with IECEx KEM 05.0020X

Classification Ex d

IIC T6

Tambient -40° to +70° C