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Radar Level Sensor Features
The WL900 Radar Level Sensors are highly accurate, noiseless and self-adjusting pulse radar level sensors for distances up to 100 ft.  The radar level sensors adjust their microwave pulse amplitude and width to a target distance and target reflection properties.  The radar level sensor's receivers change their sensitivity with the amplitude of received echoes.  In addition, the radar level sensors analyze the shapes of the received echoes and eliminate the ones coming from tank walls, standpipes and other obstructions.  These features allow the radar level sensors to track any wanted target from the tips of their rod antennas to the bottom of the tank, regardless of the tank shape or environmental conditions.  For very low dielectric constant materials (≈ 2), the radar level sensor needs at least 2 ft from the antenna tip to detect the material.  Any buildup on the rod antennas does not deteriorate the performance of the radar level sensors.  The radar level sensors do not have any mismatch between resonator and transceiver.  This eliminates problems when a target is close to the antenna and gives optimal performance of the radar level sensor's very high efficiency.  The radar level sensors also feature a low dielectric mode.  In this mode, the radar level sensors will ignore echoes from tank bottoms with material present, and they will increase their transmit energy and the sensitivity of their receivers until they detect echoes from the surfaces of the low dielectric materials.  This mode will work with dielectrics around 2 and higher.

Architecture of a Radar Level Sensor
Radar Level Sensor Architecture

Operation Principle of a Radar Level Sensor
Radar Level Sensor Operation Principle
The WL900 radar level sensor's rod antenna is stimulated by an electromagnetic pulse transmitter and sends very short pulses to a target.  The pulses reflect from the target and then they are received back by the radar level sensor's antenna.  The electrical signal from the radar level sensor's antenna is amplified and processed.  The distance to an object is calculated and then converted by the radar level sensor to 4-20 mA signal.  Optionally, level information is also sent from the radar level sensor to a PC via RS232 or RS485 for diagnostic data logging and programmable set-up.

Radar Level Sensor Still-Pipe Mounting Considerations

No end cut is required for the following:

Pipe ID Max.
2.0 inches 2.5 inches
3.0 inches 3.5 inches
4.0 and 5.0 inches 6.0 inches
6 inches 10.5 inches
  Radar Level Sensor Mounting Consideration
End cut of 45° is required for pipes longer than 10.5 inches; the ID of the pipe must be greater than 6 inches.

Radar Level Sensor FCC Information
Radar level sensors have been tested and found to comply with the limits for Class A digital device, pursuant to Part 15 of the FCC rules.  These limits are designed to provide reasonable protection against harmful interference when the radar level sensor is operating in a commercial environment.  These radar level sensors generate, use, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause interference with radio communications.  Operation of radar level sensors in a residential area is likely to cause interference that the user will be required to correct.
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