MANUFACTURER STATEMENT
The information contained in this instruction booklet has been
compiled by Advanced Specialty Gas Equipment Corp., (the
Company), from what it believes are authoritative sources and is
offered solely as a convenience to its customers. While the Company
believes that this information is accurate and factual as of the date
printed, the information including design specifications is subject
to change without prior notice.
DESCRIPTION
The Models SG6540 and SG6541 pressure switches are designed to
monitor line pressure and activate an external alarm (not supplied)
when a certain predetermined pressure is reached. They can be set to
activate on either increasing or decreasing pressure.
The pressure sensing element of the pressure switch is a force-balance,
piston-actuated assembly, sealed by a flexible Stainless Steel
diaphragm and a static O-Ring. There are three wetted parts to the
pressure switch: a pressure port, a diaphragm and an O-Ring seal
(Fig.2 see pg.9). Media pressure on the piston counteracts the force of
the range spring (adjustable by the set point adjusting nut) which
moves the piston shaft only a few thousandths of an inch to directly
actuate the switching element.
Model SG6540 is a general service pressure switch for use with non-
flammable gases. The explosion-proof Model SG6541 is UL listed and
CSA certified for use in hazardous locations; Class I group A, B, C, D
and Class II group E, F, G. Each model has a single-pole, double
throw, electrical switch with a maximum rating of 15 amps at
250 VAC. Their NEMA 4X weathertight housings are constructed
of aluminum.
Each pressure switch is supplied with two compression-type male
connectors and five feet of
1
⁄
8
in. OD stainless steel tubing for connec-
tion to a manifold or pipeline.
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