Delta Mobrey Ultrasonic Level and Flow Measurement
DMCU900&DMSP900 Series
Description
Ultrasonic transmitters send a pulse of ultrasound down to the liquid surface and detect the reflected echo. An internal microprocessor, which is preprogrammed with the speed of sound, can then translate the time taken for the pulse to be returned into the distance between the transmitter face and the liquid surface. An integral temperature sensor in the transmitter compensates for temperature change effects on the speed of sound in the ullage space.
Having established this basic distance, the transmitter calculates the depth of liquid and sends this information back to the control unit as a 4-20mA signal proportional to level. Alternatively, a ceramic cell hydrostatic pressure transmitter can be used to sense liquid level and provide the 4-20mA signal to the control unit.
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