Xylem WL900 RADAR LEVEL TRANSMITTERS - Manual (Page 7)

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Figure 2
VI. Operation
a. The microwave 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 same antenna. The
electrical signal from the antenna is amplified and processed. The distance
to an object is calculated and then converted to 4-20 mA. Optionally, level
information is also sent to a PC via RS232 or RS485 for diagnostic data
logging and programmable set-up.
b. Turning the low dielectric materials operation mode ON or OFF:
The ON mode is recommended to eliminate multiple reflections in tanks
and for materials with a dielectric constant lower than 4. To turn the low
dielectric materials mode ON, push the calibration button and hold until the
LED light flashes yellow, then red, and then turns off. Release the button.
The blinking green LED light indicates that the low dielectric materials
mode is ON. To turn the low dielectric materials mode OFF, push the
calibration button and hold until the LED light flashes yellow, then red, then
turns off. Release the button. The constant green LED light indicates that
the low dielectric materials mode is OFF. The low dielectric materials
operation can also be turned ON or OFF with the Radar Level Transmitter
software during PC communications, which is recommended.