APG Radar Level Transmitter and Submersible Pressure Transducer

(Dewi) APG Radar Level Transmitter and Submersible Pressure Transducer

Radar sensors emit low-energy, high-frequency electromagnetic impulses, generated by the sensor’s circuitry. For Guided Wave Radar sensors, these electromagnetic waves are propagated along a probe, which is semi-submerged in the substance to be measured. For Free Air Radar sensors, the waves travel through the air, focused by an antenna. When the electromagnetic waves hit the surface of the substance, part of the impulse energy is reflected back to the sensor, either up the probe or through the air. The circuitry of the sensor then calculates the level based on the time difference between the impulses sent and the impulses reflected. True Echo™ technology is not affected by pressure, vacuum, temperature, viscosity, foam, or dust. Changes in dielectric constant or material accumulation on the probe or antenna do not affect the level measurement due to the dynamic sensing technology programmed in our True Echo™ level transmitters.

Submersible pressure transducers work just like other pressure transducers, except they’re inside a water-tight housing, and they read in feet or inches of liquid (adjusted to specific gravity) rather than PSI. This is done with a simple equation. PSI is converted to feet by multiplying it by 2.31 and then dividing it by the specific gravity. There are 2.31 feet of water in a 1 inch square column of water that weighs 1 pound, hence the conversion factor. We multiply by the specific gravity (density) to get a true height of whatever liquid it is. For example, petroleum oil has a specific gravity of about 0.8. So a 1 pound, 1 square inch column of petroleum oil would be about 2.89 feet high.

Radar Level Transmitter

Submersible Pressure Transducer