SM ... float switches

Control units with rod operated microswitch
for liquid level indication or
regulation of liquid levels

for electrical systems
and
for pneumatic systems

Following types are available:

For use in intrinsically safe circuits in potentially explosive atmospheres in categories
- float side: zone 0, 1 or 2,
- terminal box: zone 1 or 2;

EC type examination certificate:INERIS 03ATEX0224

1. Electrical float switches with microswitch

- SM/./E/EL/Ex-0G II 2/1 G Ex ia IIC T6, for mounting from the side
- SM/V.../E/EL/Ex-0G II 2/1 G Ex ia IIC T6, for mounting from the top

2. Pneumatic float switches with pneumatic 3/2-way valve

- SM/./E/PN/Ex-0G II 2/1 G c IIC T=0, for mounting from the side
- SM/V.../E/PN/Ex-0G II 2/1 G c IIC T=0, for mounting from the top

Mode of operation for electrical systems:
The rising or falling liquid level causes the float to move marginally up or down.
When the float rises, it activates a microswitch in the form of a changeover switch.

Mode of operation for pneumatic systems:
The rising or falling liquid level causes the float to move marginally up or down. When the
float rises, it activates a pneumatic 3/2-way valve.

These units are not suitable for use in turbulent liquids (e.g. in stirrer tanks).