32 Ultrasound Controller Manual
measuring the level. Make sure the echo is reflected properly back to the level sensor and that the
Level Switch is horizontal. The bottom thickness and material also influences the echo strength,
see Mounting the Level Sensor. If bottom thickness is such that resonance is not at 2MHz the
echo is weaker. Bubbles or particles scatter the echo.
dBWR shows the strength of low level echoes (0-20mm) using the WR-technique. Low level
echoes dBWR are compared with the WR threshold and if dBWR is above this threshold, and the
velocity sensor detects low level, then the WR-technique measurement takes over and forces the
level to be whatever it measures. If WR threshold is lower it becomes more sensitive but risk
increases of wrong detection due to temperature changes. Empty container gives rather weak low
level dBWR indication. In an empty container there is no echo from a surface and the WR-
technique is then comparing the echoes within the bottom with calibrated echoes within the
bottom as measured with liquid. With higher WR threshold the WR-technique becomes less
sensitive and may miss detecting empty container. Set to disabled, WR-technique is disabled.
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