Instruction Manual
Form 416 (01.13) ©SOR Inc. 
1/8
These instructions provide information for installation and 
field calibration of B Temperature Switches.
Process temperature changes cause proportional 
vapor pressure changes in the temperature sensing 
bulb that acts on a diaphragm/piston assembly to 
actuate and deactuate a snap-action electrical switching 
element at discrete process temperatures. The instrument’s 
behavior is determined by vapor pressure (105 range model 
fill media is inert gas). For best results with the SOR
®
thermal activated temperature switch, the entire probe 
must experience the media being monitored. If a 
thermowell is being used, a thermal paste is recommended 
to ensure the transfer of heat through the well to the probe.
B Temperature Switches
General Instructions
Registered Quality System to ISO 9001
Design and 
specifications are 
subject to change 
without notice. 
For latest revision, go to 
www.sorinc.com
Table of Contents
Installation ....................................... 2
SIL Installation ..................................2
Electrical Connection ...........................3
Calibration .......................................3
Dimensions ......................................4
Operation.........................................6
ATEX Marking Information .....................7
Declaration of Conformity .....................8
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 model 
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ended 
probe
.
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.








