32 Ultrasound Controller Manual
SHOW DATA
Select Measured data to show measured data. All four Gel Sensors are shown together. Pressing
MENU button scrolls through: Gelconc. %, Relativ Signal %, RelativAtt. dB/m, Signal dB and Liq WR
sensor dB.
Gelconc. %, is the measured gel concentration.
Reltiv Signal %, is measured echo signal strength in percent of calibrated echo signal strength.
RelativAtt. dB/m, is the measured sound attenuation per meter. It is set to zero at calibration and it
is independent of echo-distance.
Signal dB is the measured echo signal strength (dB) where 85dB is maximum and 0dB is
minimum. When signal is below 20dB, then echo is so weak that there is risk that the measured
gel-concentration is lower than actual gel-concentration.
Liq WR sensor dB is the signal from the WR-measurement and it is relative to signal at calibration
(dB). It is near 0dB with liquid and depending on the container wall around 3dB with air.
Select Calibrated Data to show calibrated data. All four Gel Sensors are shown together. Pressing
MENU button scrolls through: Cal Liq dB, Freq and Test Sensor dB
Cal Liq dB is the measured echo signal strength during calibration with liquid (dB). The higher the
better. Lower than 35dB is considered to be too weak signal.
Freq is the chosen frequency: 1=1,3MHz, 2=1,5MHz, 3=1,7MHz, 4=2MHz, 5=2,2MHz or 6=4MHz.
Use as high as possible (except only GSF90 uses 4MHz). Steel or glass wall thickness may make
it necessary to change to a lower frequency in order to get high echo strength.
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 sensor can be connected.
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.
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. On GSF90 it works well. On a glass wall and polypropylene wall it has temperature
dependence and should not be used if there is more than +- 7°C variation during measurement.
On steel wall it is not recommended.
Gel Sensor TROUBLESHOOTING
Display shows:
-- - The Gel Sensor is not connected or there is a short circuit.
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