Operator Interfaces, Switches & Relays


Pneumatic level switch for viscous and corrosive liquids

August 2013 Operator Interfaces, Switches & Relays

The compact FP series pneumatic level switch is ideal for point level switching of liquids that are highly viscous, corrosive or contain solids in suspension. It can be easily integrated into original equipment for replacement purposes.

It consists of a sensing head with a diaphragm and micro-switch housed in either a plastic (FP-3), die-cast aluminium (FP-1A) or SS (FP-1S) body, and is used in conjunction with a guide tube compatible with the medium being measured. As the level of the medium rises, the column of air is pushed up the guide tube into a chamber, which in turn pushes the diaphragm to activate the micro-switch.

The switch is insensitive to highly viscous and corrosive liquids – the medium to be measured is only in contact with the guide tube and not directly with the sensor. The guide tube can be selected to be compatible with medium. For highly viscous media a guide tube with a large diameter can be selected. The movement of the diaphragm is restricted to a maximum of 2 mm, thus minimising wear and tear on the diaphragm itself.

The high quality micro-switch incorporates a dead-band between set and reset points. This minimises bouncing in the case of turbulence of the measured medium and ensures stable operation.



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