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A
pulse is emitted from the non-contact
level sensor's transmitter. The pulse travels to the surface being
monitored
and is reflected off the surface, back to the sensor.
The time of flight is divided by 2 and converted
to an output signal directly proportional to the
material level. In the case of the ultrasonic
sensor,
temperature is measured to compensate for the speed
variation of the ultrasonic pulse |
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