SOR Thermal Differential Flow Switch - Manual (Page 2)

2/12 Form 1024 (08.13) ©SOR Inc.
The T21 has a 3/4-inch MNPT mount (standard), designed for easy installation
through a threaded port.
 Conduit is recommended for all wiring to the switch.
 Due to the pipe thread mounting, it may be necessary to make a trial fit, add
or remove teflon tape or other pipe thread sealant and reinstall to achieve a
satisfactory seal with the sensor properly oriented.
 Proper orientation is marked on the switch body for reference.
 It is generally recommended that the sensor tips be located at 1/4 of the pipe’s
inside diameter (I.D.) assuming pipe is full. (See )
Level Application
 The switch body MUST be oriented with the two sensor tips aligned paralled to the
level being detected. (Disregard for top mount installation.)
Flow Application
 The swtich body MUST be oriented with the two sensor tips aligned perpendicular
to the flow being detected.
Mechanical Installation
Use a 1-1/8”, open-end wrench to tighten at the HEX fl ats of the MNPT of
a standard switch. Do not use the instrument head to tighten the switch
to the mounting port. Rotation of the instrument head with respect to the
sensor body may cause internal wiring damage.
For level and fl ow applications the material you are monitoring MUST contact the
two sensor tips at the same time .
Incorrect
Sensor
T
ips
Material
Direction
Sensor
Tips
Sensor
T
ips
Material
Direction
Incorrect Sensor
Tips
Material Direction
Sensor
T
ips
Sensor
Tips