SOR Single Point Ultrasonic Level Switch - Manual

Form 771 (08.13) ©SOR Inc. 1/20
The Ultrasonic Point Level Control indicates 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. The yellow LED is lit, indicating 8 mA current output.
When process liquid fills the sensor cavity, the receiver detects a strong signal because
liquids are good conductors of ultrasonic waves. The red LED is lit, indicating 16 mA
current output.
The Ultrasonic Point Level Control constantly monitors sensor integrity and changes the
current output in the unlikely event of a sensor failure. The Failure Mode Switch located
inside the control housing can be field selected to either 5 mA or 19 mA to indicate
sensor failure.
Remote Self-Test is provided with non-intrinsically safe units only. Units equipped with
two terminal blocks feature the remote self-test. A dry contact may be used up to 50
feet/15 meters from the control to simulate a sensor failure.
Standard 316SS and Tefl on Notch-Type sensors, epoxy tip-sensitive, and 316SS viscous
sensors are available for use with the point level control. Extreme care must be taken when
installing units with Teflon
® sensors. See installation instructions beginning on page 2.
Ultrasonic Two-Wire
Point Level Control
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 .......................................3
Remote Cable Connection .....................4
Remote Electrical Connection ................4
Electrical Connection ...........................5
Calibration and Function Test .................8
Sensor Replacement ...........................9
Circuit Board Replacement ....................9
CE Marked Units .............................. 10
Control Drawings ............................. 11
Troubleshooting ............................... 16
Dimensions ................................ 17-19