©AM SENSORS LTD
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AMS-S-082/DS/09.2016 (ISSUE 2)
2. Functional Description
AMS magnetic float switches are ideal for high and low liquid level alarm,
and pump control duties. These Liquids should not contain heavy soiling or
coarse suspended matter and must not show a tendency to crystallize when
drying out. If the liquids that the float switch is being used to measure do have
conditions as listed above then routine maintenance should be carried out to
ensure the float can still pivot on the guide tube.
The ATEX Group I Horizontal float switch is designed to open or close a circuit
(“switch”) as a changing liquid level within a vessel passes the level of the float
(the Switch Point).
When the process liquid level is below the Switch Point, the contacts are either
open circuit (NO) or closed circuit (NC) depending on the switch configuration
as determined by the customer, when the liquid level raises the float will
become buoyant and as the liquid level increases passed the switch point the
contacts will change over.
The float arms have an in- built magnetic which operates the reed switch
contact through the wall of the guide tube. Thus the switching operation is
without direct contact to the liquid, free of wear and tear, and does not require
any power supply.
Benefits of using AMS Magnetic Float Switch Technology
i)
Over 40 years of experience – a proven design (Ex Alan Cobham)
ii)
Simple, reliable, and cost effective level measurement technology
iii)
Tough, rugged design for long life in aggressive environments
iv)
Operates in almost any liquid at high pressures and temperatures
v)
Measurement is unaffected by changes in process temperature,
dielectric, or the presence of vapours
An approval has been issued for the FS1790 ATEX Group I Horizontal float
switches for use as explosion-protected equipment within the scope of
application defined by EU Guideline
94/9/EC ATEX in hazardous areas.
They comply with the specifications concerning equipment and protective
systems intended for use in potentially explosive atmospheres.
THE TECHNICAL DATA IN THIS OPERATING INSTRUCTION MUST BE COMPLIED WITH.
FS1790 Float Switches carry the following ATEX Certification plate:
3. Areas of Application