AQ M-Tech AB Ultrasound Controller Manual 31
It is recommended to perform a new calibration every year to compensate for possible slow
changes.
SHOW DATA
Select Measured Level Sensor: to show measured level mm, echo strength dB, the amount of
background noise dBnoise, dBWR which is the strength of very low level echo. Check that the
value of echo strength dB is high and dB noise is low.
Select Calibrated Level Sensor: to show calibrated echo strength dB and calibrated selected
frequency MHz.
Select Measured velo Sensor to show echo strength % of calibrated strength with liquid and dB and
used velocity m/s and whether there is AIR or LIQ behind sensor 2.
Select Calibrated Velo Sensor to show calibrated velocity m/s, calibrated echo strength dB,
calibrated frequency MHz and calibrated threshold for detecting liquid %.
Select Low level WR-measurements to show data from low level measurements (for troubleshooting
only)
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.
Select PROFIBUS SETTINGS see page 42 (for DP72).
HELP
Select HELP to show information about connecting the Ultrasound Controller.
Level Sensor TROUBLESHOOTING
Display shows:
set Some setting is missing
cal Calibration of air and/or liquid must to be done.
>100% Measured level is >100%. Consider changing Range.
err1 During calibration with liquid, the echo from the level sensor is missing or very weak.
err2 During calibration, the difference in strength between echo with liquid and with air is too
small.
err3 During calibration, the echo with liquid from the velocity sensor is too weak.
Container is full and the inside surface of the top of the container is shaped in such a way that
echoes are reflected in wrong direction. – Make a small portion of the inside surface flat just
above the level sensor.
Level sensor is aimed in wrong direction. – Aim the level sensor in the right direction.
The container is inclined and thereby the echo is bounced off in wrong direction. – Unincline the
container or aim the level sensor to correct it.
The echo strength dB, dBnoise and dBWR should be checked. In order for Ultrasound Controller to
measure the level it needs echoes from the surface. Due to various reasons however the echoes
can become too weak to be detected. Echo strength dB indicates how strong the echo is and
should be compared to dB noise which is the background noise. In an empty container there is no
echo. If the echo strength dB is not higher than 10dB above dBnoise there can be difficulties
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