SOR Single Point Ultrasonic Level Switch - Manual (Page 2)

2/20 Form 771 (08.13) ©SOR Inc.
Installation
Notch-Type and Epoxy Sensors (Series 371-N and 371-E)
Ultrasonic Level Sensors can be mounted by inserting the sensor through a fitting in a vessel,
or over an open sump or basin. Special care must be taken when installing Teflon
® sensors.
Keep the sensor cavity out of the direct flow of liquid fill to prevent false readings.
Avoid installation of sensor in turbulent areas
such as pump discharge or suction. Air pockets
may be present in these areas which may cause
false indication.
Irreparable damage may be done to Tefl on sensors by turning metal hex
and Tefl on hex separately. Always rotate metal hex and Tefl on hex
simultaneously. Do not apply more than 10 in. lbs. of torque to either
hex during installation.
DO NOT weld any part of
this instrument
Sensor
Base Hub
No Obstructions
Apply thread sealant
Always turn Teflon hex & metal hex
together when installing
sensor into process.
Tank or Vessel
Make sure that the sensor can be fully inserted and
tightened without interference from obstructions
inside the tank or vessel. (See
)
An alignment mark X stamped on a wrench flat (or on
the dry face of a flange below the housing) shows sensor
cavity orientation. (See
)
Notch Type Sensors – Optimum drainage occurs when the
X mark is located at 3 or 9 o’clock.
The sensor must project through a tank fitting so that the
sensor cavity is at least 1” (25.4mm) beyond the inner
wall of the tank. (See
)
Notch Sensor
Alignment mark shown
at 3 o’clock
Alternate position: 9 o’clock
1
inch minimum
Apply suitable sealant to the process connection to prevent process leakage. (See )
Use an open end wrench to tighten the sensor into the process connection.
Do not use the sensor base as a handle to tighten the process connection.
Horizontal Mounting
Horizontal mounting is recommended for use in highly viscous liquids, or liquids
containing sludge and debris. When tightened securely, the sensor cavity must face
sideways for optimum drainage when process liquid level drops below the sensor cavity.