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SYSTEM DESCRIPTIONS
4
For Ultrasonic Point Level Switches
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GENERAL DESCRIPTION
These series of Liquid Level Detection systems are ideal, low cost ultrasonic liq-
uid level detection systems for many applications. They operate in a broad spec-
trum of viscous to light liquids.
The LL-10 Series operates using ultrasonic sound wave propagation. Ultrasonic
sound waves are greatly attenuated when transmitted through air. Conversely,
when liquid is present, transmission of the sound waves is greatly enhanced. The
electronic control unit generates electrical signals that are converted to bursts of
ultrasonic energy at the sensor. The ultrasonic bursts are transmitted across the liq-
uid sensing gap. Upon receipt of a valid signal, the solid state electronics gener-
ate a “data enable” condition indicating liquid is present. This signal energizes a
relay and/or provides an output condition.
NOTES:
1. Standard Sensor Material: 316 Stainless Steel. Solid one piece molded body
Tefzel is also available.
2. 3/4” NPT mounting is standard, different NPT and flanges are optional.
3. Standard length of the sensor is 2.50” with activation point 1/4” from the bot-
tom of the sensor. Extension up to 100” is available.
PRINCIPLES OF OPERATION
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