Nuclear-Qualified
Thi
#
.
Pressure Switches
General Instructions
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.
sproduct should on
Installation
be installed by
Failure to mount the housing on
a at mounting surface may
result in torsional forces on the
housing that could cause false trips or
render the pressure switch inoperative.
The vent connection must be plugged or vented to dry atmosphere as
required by application requirements. Test Data Sheet SOR form # 716
is supplied for each serial number and provides switch performance data in
rips or
erative
to dry atmosphere as
Sheet
switch
R f
716
erformance data in
the vented and plugged condition.
Process Connection
Securely connect process line to pressure port using two wrenches: one to hold hex flats on
pressure port, the other to tighten process pipe or tube fitting.
Be certain the process connection is tightened and positioned so bending
and torsional forces imposed on pressure switch are minimal. Use care
not to loosen pressure port from body or body from housing.
Electrical Connection
Electrical connections are
SPDT
DPDT
marked on the insulation of
the wire leads. Conduit should
be installed without applying
strain to the housing.
Pressure
Pressure
Vacuum switches only
Vacuum
Design and specifications are subject to change without notice.
For latest revision, go to www.sorinc.com
Form 654 (04.13) ©SOR Inc.
Vacuum
1/4
Minimum Bend Radius for Wire
Permanent Training 1/2”R
Pulling Tension 1”R
Terminating Junction 1/4”R
Site Storage
Store switch in a dry area in the original shipping package. Shelf life is 10 years for a maximum ambient temperature of 80°F, based on aging data in SOR Test Report 9058-102.
Calibration
To check the set point of a switch, monitor either the common (C) and normally open (NO)
or the common (C) and normally closed (NC) contacts for change of state. Connect the
process connection to a regulated hydraulic or pneumatic pressure source. Monitor with
an accurate pressure measuring standard. Slowly increase or decrease the pressure to
accurately capture the precise moment that the switch changes state. To assure the most
accurate and repeatable results, the switch must be tested in an identical manner each time
the calibration is checked.
Increasing Set Points
Switching Element
If the normal operating pressure is below the set point,
then the pressure should be increased from 0 PSI up to
the increasing set point and then back down to the
reset point. Repeat this cycle as necessary.
Decreasing Set Points
If the normal operating pressure is above the set point,
then the calibration should be checked by first pressurizing to the normal operating pressure, then reducing the
pressure to the decreasing set point, and then increas-
Adjusting Nut
ing the pressure to the reset point. Repeat this cycle as
necessary.
Calibration Scale
To adjust pressure at which switch will operate, remove cover and tighten the hex head adjusting nut
with a 3/4” wrench to increase pressure; loosen to reduce pressure. Sighting across the top of the
3/4-inch hex adjusting nut to the scale gives approximate set point pressure.
After calibration is complete, reinstall the cover with new gaskets or o-rings as required by
the Maintenance instructions.
2/4
The switching element has been positioned with a dial indicator to a tolerance
of
±.002 inches. Do not move this switching element! Its position has nothing
to do with the set point adjustment. Any movement can either render the switch
inoperative or cause the switching element to be damaged with overpressure.
Form 654 (04.13) ©SOR Inc.
N6 Housing
Cover Screws
1/8” NPT(F)
Vent Connection
3/4” NPT(F)
Conduit
Connection
Body
Mounting
Holes
Process Connection
(Pressure Port)
Mounting Hardware Fasteners per SOR Test Report 9058-102 consist of two 1/4-20,
Grade 5 screws (not supplied). Torque screws to 70 to 85 in-lbs.
Maintenance Replace cover gasket (SOR P/N 8923-180) whenever cover is removed or
minimum of once every 5 years, whichever comes first. Remove the four cover screws.
Remove the old gasket. Place new gasket between housing and cover. Line up holes in
cover, gasket and housing. Insert the 4 screws and torque each to 7 to 10 in-lbs.
TA Housing
Cover
1/4” NPT(F)
Vent Connection
Body
Process Connection (Pressure Port)
Mounting Hardware Fasteners per SOR Test Report 9058-102 consist of three standard
grade 1/4-inch U bolts (not supplied).
Maintenance Replace cover o-rings (SOR P/N 8923-206 and 8923-207) whenever cover
is removed or minimum of once every 5 years, whichever comes first. Unscrew the cover.
Remove the old o-rings. Place new o-rings in groove of cover. Lubricate o-rings with light
film of Krytox 240AC grease (or equivalent fluorinated grease). Tighten cover until the
flange of the cover makes contact with the housing.
U-Bolts
3/4” NPT(F)
Conduit Connection
Form 654 (04.13) ©SOR Inc.
3/4
RT Housing
Cover Screws
1/8” NPT(F)
Vent Connection
Body
Mounting Holes
Process Connection
(Pressure Port)
3/4” NPT(F)
Conduit Connection
Mounting Hardware Fasteners per SOR Test Report 9058-102 consist of two 1/4-20,
Grade 5 screws (not supplied). Torque screws to 70 to 85 in-lbs.
Maintenance Replace cover gasket (SOR P/N 8923-181) whenever cover is removed or
minimum of once every 5 years, whichever comes first. Remove the four cover screws.
Remove old gasket. Place new gasket between housing and cover. Line up holes in cover,
gasket and housing. Insert the 4 screws and torque each to 7 to 10 in-lbs.
Printed in USA www.sorinc.com
14685 West 105th Street, Lenexa, KS 66215 913-888-2630 800-676-6794 USA Fax 913-888-0767
4/4
Form 654 (04.13) ©SOR Inc.
Loading...