AQ M-Tech AB Ultrasound Controller Manual 41
Test Sensor dB shows Liquid Sensor WR signal. It can be used to test a Gel Sensor not attached to
a container. If the Gel Sensor is correctly connected a value between 0 and 30 should be shown.
Pressing on the inner side of the Gel Sensor with a thumb the value increases showing the Level
Switch is working. A bad Level Switch, wrong or not connected will show a value 60 or more.
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 type of sensor can be connected.
Select RESTORE settings and calibrations to restore all settings and calibrations to factory-settings.
Select PROFIBUS SETTINGS see page 42 (for DP72 and GP72).
HELP
Select HELP to show information about the Ultrasound Controller.
Measurement Reliability
Many factors determine the reliability (wall material, wall thickness, liquid properties, temperature
and glue). Therefore, it is always advisable to make tests under varying conditions and
temperatures.
The reliability of Liquid Sensor WR depend on the container wall. On a plastic wall 10-30mm it
works well and on GF90 it works well. On glass and steel wall it does not work well.
Gel Sensor TROUBLESHOOTING
Display shows:
-- The Gel Sensor is not connected or there is a short circuit.
cal Calibration has never been done.
set Some settings are missing.
err During calibration the echo signal was too weak: The reason can be: Calibration was done
without liquid or with gel. Or the Level Switch is not attached correctly to the container
which means a tiny air-gap between the Level Switch and the container. Or DISTANCE to
reflecting wall is set wrong. Or the echo is reflected in a direction where it does not reach
the Level Switch. Or something obstructing lies between the Level Switch and the
reflecting wall. Or the container wall does not let through enough sound using the selected
FREQUENCY. Or wrong connection or faulty Level Switch. Select Test Gel Sensor can be
used to test the Level Switch and its connection.
Electric interference can show itself in that attenuation and gel concentration are not able to
become high enough with gel. To minimize the risk of interference it is important that sources of
interference (like frequency inverters) should use shielded cables between inverter and motor.
Also any unshielded part of the cable between the Level Switch and Ultrasound Controller should
be short. If ex-barriers are used, Ex-barriershields should be used.
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