2PRINCIPLES OF OPERATION
The Level switches 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, either integral or remote to the sensor, generates electrical signals that are converted to bursts of ultrasonic energy at the sensor. The ultra- sonic bursts are transmitted across the liquid sensing gap of the sensor. Upon receipt of a valid signal at the receiver, the solid state electronics generate a “data enable” condition indicating liquid is present. This signal energizes a relay and\or provides3an output condition.
INSTALLATION
GENERAL
All units are easy to install. A sensor with an integral electronic control unit or a sensor with a remote control unit can be mounted in any position or orientation desired.
Make sure that all wiring, conduit and electrical fittings conform to local electrical codes for the location selected.
VISUAL INSPECTION
Unpack the control unit and sensor assemblies. Visually inspect them for any damage. Advise Cosense immediately if either assembly is damaged.
PRELIMINARY OPERATIONAL CHECK
Before installing the unit, a simple operational checkout should be performed as follows:
WARNING: In a hazardous environment never open the housing cover or con- nect the power leads without first disconnecting the electrical power at its source.
1.Fill a container with liquid.
2.Open the control unit housing cover and connect the power to the control unit (see appropriate wiring diagram for your unit).
3.Apply power from the source.
4.Place the sensor in the liquid. The relay should energize, or output will switch to 20.0±1.0mA.
5.Remove the sensor from the liquid. The relay will
6.Disconnect the power to the control unit.
7.Proceed to final installation.
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