SOR Single Point Ultrasonic Level Switch - Manual

Form 841 (08.13) ©SOR Inc. 1/16
Ultrasonic Two-Wire
Point Level Control
with Tip-Type Sensor
General Instructions
Registered Quality System to ISO 9001
Design and
specifications are
subject to change
without notice.
For latest revision,
go to sorinc.com
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.
Table of Contents
Installation .......................................2
Remote Cable Connection .....................3
Electrical Connection ...........................4
Calibration and Functional Test ..............6
Delay Timer operation (DT accessory) ......6
Time Delay Switch Settings ...................7
Troubleshooting .................................8
Sensor Replacement ...........................8
Circuit Board Replacement ....................9
Cable Shielding .................................9
Dimensions .................................... 10
Control Drawings ......................... 11-14
The Ultrasonic Point Level Control produces an 8mA or l6mA current to indicate liquid
presence/absence within a sensor cavity. Two piezoelectric crystals face each other across
the sensor cavity. One crystal transmits an ultrasonic signal; the other crystal receives
the signal.
When the sensor cavity is empty, the receiver detects a weak signal because air is a poor
conductor of ultrasonic waves.
When process liquid fills the sensor cavity, the receiver detects a strong signal because
liquids are good conductors of ultrasonic waves.
The wet probe switch inside the electronics housing switches between 8mA and 16mA
output in the wet probe condition. Internal LEDs indicate the current output over the loop.
A red LED indicates 16mA current output, and a yellow LED indicates 8mA current output.
An optional timer is available to delay the current change from 0 seconds to 10 minutes.
The delay timer provides added process control, valuable for use in turbulent conditions.