SOR Weatherproof Pressure Switch User Manual
Kier Cover
Safety Interlock Applications
Supplemental Instructions
SOR® Pressure Switches intended for use in Kier Cover Safety Interlock Service are
normally installed to sense vessel pressure. As the vessel is pressurized, the pressure
switch actuates. Pressure Switch actuation is designed to prevent accidental opening of
the pressurized vessel. (Refer to wiring diagram on General Instructions.) Upon completion
of the pressurization cycle, the vessel depressurizes to the point where the vessel can be
opened safely and the pressure switch de-actuates to permit opening.
SOR Pressure Switches used in Kier Cover Safety Interlock Service are normally ordered
with a tantalum wetted diaphragm. End user preference indicates that tantalum diaphragm
material offers the longest service life in this application. If the tantalum diaphragm is
heated by the process liquid during service, a temperature-induced delay may occur. A
slow dissipation of diaphragm temperature may cause the pressure switch to remain
actuated when vessel pressure has fallen to a level which normally permits safe opening
of the vessel. When the tantalum diaphragm cools, it will allow the pressure switch
to de-actuate.
If high process temperature delays de-actuation and elimination of the delay is desirable,
mount the pressure switch remotely with connecting tubing or piping long enough to allow
process and ambient temperature to dissipate before reaching the pressure switch.
NOTE: If you suspect that a product is defective, contact the factory or the SOR Representative
in your area for a return authorization number (RMA). This product should only be installed by
trained and competent personnel.
Design and specifications are subject to change without notice.
Form 495 (05.13) ©SOR Inc.
For latest revision, go to sorinc.com
Registered Quality System to ISO 9001
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Printed in USA sorinc.com
14685 West 105th Street, Lenexa, KS 66215 913-888-2630 800-676-6794 USA Fax 913-888-0767
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Registered Quality System to ISO 9001
Form 495 (05.13) ©SOR Inc.
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