20 Ultrasound Controller Manual
ADVANCED SETTINGS
Select Set sensor MODE to set either Air Sensor mode, Level Switch mode, Level Sensor mode or Gel
Sensor mode mode. It determines which sensor can be connected.
Select SIMULATE to simulate detection of air or liquid. Press SELECT button to toggle between
simulation of Air and Liq. Press MODE button to change between Level Switch 1, 2, 3 and 4.
Select RESTORE settings and calibrations to restore all settings and calibrations to factory-settings.
HELP
Select HELP to show information about connecting the Ultrasound Controller.
Sound velocity and the Level Switch
When ECHO Technique is used and there are two liquids with significant different sound velocity in
the container and these liquids are not well mixed, then there can be a false indication of air
because the sound is refracted at the surface between the two liquids. Sound velocity of liquids
lies usually within 900-2000m/s. A sound velocity outside this range may be compensated by
increasing or decreasing DISTANCE to reflecting wall.
Measurement Reliability
Many factors determine the reliability (wall material, wall thickness, liquid properties, temperature
and glue). Therefore it is always advisable to make tests on the actual container under varying
conditions and temperatures.
Level Switch TROUBLESHOOTING
Display shows:
-- - The Level Switch is not connected or there is a short circuit.
cal - Calibration has not been done. It must be calibrated both for Air and Liquid before cal
disappears.
set - Echo technique is chosen but the DISTANCE to reflecting wall is not set.
The relay does not change but the display changes between Air and Liquid. — Wrong setting of
RELAY.
err - Measurement cannot be done. During calibration there was not enough difference between
the signal with air and with liquid: For ECHO technique, echo threshold Ethd must be < 50%
and for WR technique, WR threshold Wthd must be > 5. The reason for err can be:
Calibration was made for Air but there was Liquid in the container or calibration was made
for Liquid but there was Air in the container.
The Level Switch is not attached correctly to the container. There is a tiny air-gap between
the Level Switch and the container.
If ECHO technique is chosen and the DISTANCE to reflecting wall is wrong.
If ECHO technique is chosen and the echo is reflected in a direction so it does not bounce
back to the Level Switch.
If ECHO technique is chosen and the something is obstruckting the sound beam.
The liquid does not let through enough sound. Try using a Level Switch RS instead of a
Level Switch LS.
The container wall does not let through enough sound. Try a different FREQUENCY or set it to
Auto.
Wrong connection or faulty Level Switch. Select Test Level Switch: to test the level switch and
its connection.
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