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Sub Mini-Hermet
Pressure Switches
General Instructions
These instructions cover mounting, process connection, electrical
connection and calibration of the Sub Mini-Hermet Explosion Proof
Pressure Switches.
The switching element is hermetically sealed in an explosion proof
capsule that is SAA Approved Ex s IIC T6 for Class I, Zone 1, and
UL Listed and CSA Certified for hazardous locations Class I,
Groups A, B, C & D; Class II, Groups E, F & G; Divisions 1 & 2.
NOTE: If you suspect that a product is defective, contact the
®
factory or the SOR
authorization number (RMA). This product should only be
installed by trained and competent personnel.
Representative in your area for a return
Installation
The pressure switch may be line mounted to either rigid process piping or electrical
conduit. The body of the pressure switch should be clamped to a suitable member on
applications when rigid process piping or electrical conduit is not available.
Safety Integrity Level (SIL) Installation Requirements
The SOR pressure switches have been evaluated as Type-A safety related hardware.
To meet the necessary installation requirements for the SIL system, the following
information must be utilized:
Proof Test Interval shall be one year.
Units may only be installed for use in Low Demand Mode.
Products have a HFT (Hardware Fault Tolerance) of 0, and were evaluated in a
1oo1 (one out of one) configuration.
Form 1538 (03.12) ©2012 SOR Inc.
Process Connection
Use two wrenches when connecting process pipe: a 1-1/8-inch open-end wrench to hold
the hex port while connecting the process pipe; the other wrench to tighten the process
pipe or tube fitting.
When rigid process piping is used, it is important that no bending or torsional
forces be imposed on the pressure Switch.
Design and specifications are subject to change without notice.
Form 264 (08.13) ©SOR Inc.
For latest revision, go to sorinc.com
Registered Quality System to ISO 9001
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Dimensions
Linear = mm/inches
Drawing 0091356
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Dimensions are for reference only.
Contact the factory for certified drawings
for a particular model number.
Form 264 (08.13) ©SOR Inc.
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Electrical Connection
Ensure that wiring conforms to all applicable local and national electrical codes and install
unit(s) according to relevant national and local safety codes.
Use a 1-1/8”, open-end wrench to hold the hex on the electrical connection while conduit
or conduit fitting is being tightened.
The electrical switch element capsule assembly contains UL Listed and CSA Certified
factory-sealed leads. A conduit seal is not required to preserve explosion proof integrity.
Electrical leads are marked NC (Normally Closed), NO (Normally Open) and C (Common).
Electrical switching elements are snap-action and are either SPDT or DPDT (2-SPDT) set to
actuate simultaneously.
Do not use a pipe wrench or strap wrench on the round body nor an open-end
wrench on the hex pressure port while tightening the conduit connection,
because the hermetically sealed switching element capsule has been
precisely positioned and locked during manufacture. Excessive force could
overcome the lock and cause movement which will adversely affect operation
or render the pressure switch inoperative. Should movement occur, factory
calibration must be performed in order to restore normal operation.
DPDT (2-SPDT)
SPDT
Pressure
Blue (C)
Black (NO)
Red (NC)
Yellow (C2)
Brown (NO2)
Orange (NC2)
No. 2No. 1
Green (GND)
Blue (C)
Black (NO)
Red (NC)
Form 264 (08.13) ©SOR Inc.
Pressure
Green (GND)
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Calibration (Adjustable Models ONLY)
Field adjustable models have a set point adjustment under the removable weathertight cap.
It is not necessary to disconnect the electrical power, since the electrical switching element
is inside the hermetically sealed, explosion proof capsule, thereby maintaining explosion
proof integrity.
Remove knurled weathertight cap.
Use 3/32” hex (Allen type) wrench to turn adjusting screw to achieve desired set point.
Turn adjusting screw clockwise (in) to increase set point; turn adjusting screw
counterclockwise (out) to decrease set point.
If adjusting screw is turned counterclockwise too far, it can cause the guide disc
to slide down. The unit will then be inoperable.
Use an external pressure measuring device to accurately calibrate set points.
After the set point has been calibrated, replace the weathertight sealing cap tightly to
ensure the weathertight integrity of the device.
SOR discourages eld modi cations, change-out of wetted parts or repair. It is
recommended that products be returned to SOR for inspection and necessary
repair work. Contact the factory or the SOR representative in your area for a
Returned Goods Authorization number. Any eld work should be performed by
quali ed instrument technician with formal SOR procedures.
Units in hazardous locations prior to removal from service, make sure that the
work area is declassi ed. Failure to do so could result in severe personal injury
or substantial property damage.
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 264 (08.13) ©SOR Inc.
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