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 Ultrasonic
pulses transmitted from the transmitters face are reflected from
the surface of the liquid and are received back by the same transmitter.
Measurement of the time delay between the transmit and receive
signals enables the microprocessor controlled electronics to
calculate distance to the liquid level.
Once the transmitter is programmed with bottom reference of
the application - usually the bottom of the tank - the liquid
depth is calculated. The microprocessor controls the loop current
to give a 4-20mA output signal proportional to the level, with
the liquid level reading also available on LCD display inside
the enclosure. All transmitters have integral temperature compensation
to maintain accuracy across the operating temperature range.
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