AQ M-Tech AB Ultrasound Controller Manual 17
Very Low Sensitivity Data
This page shows data from the very low sensitivity measurement. This measurement technique is
different from the normal measurement technique and is used only for very low and very very low
sensitivity settings. The two data on each line correspond to the two perpendicular measurements.
On the first line is VLdata showing the current measured ultrasound strength.
On the second line is VLthld showing the threshold. VLthld is measured and stored during
calibration. Liquid is detected when VLdata is > VLthld. For reliable operation VLthld should be > 5.
AUXILIARY DATA
This page shows unprocessed data from the Air Sensor. It can be used for troubleshooting when
contacting AQ M-Tech AB.
HELP
Select HELP to show information about how to connect the Ultrasound Controller.
Sound velocity in the Air Sensor
With sensitivity set to low, medium or high and with two liquids having different sound velocities in
the Air Sensor and with these liquids not well mixed, there can be false indication of air. The
sound is refracted due to velocity change, as it travels from one liquid to another. Setting longer
filter times and lower sensitivity can reduce such false indications of air.
Air Sensor CQS
Air Sensor CQS has a relatively large diameter and therefore it uses four measurement zones
instead of two. This improves bubble detection. However only one Air Sensor CQS can be
connected to one D72. Settings should be set for air sensor 1 (setttings for air sensor 2 is disabled
when air sensor 1 is set to CQS).
Air Sensor TROUBLESHOOTING
Air or Liquid is indicated on the display but the relay does not change = RELAY setting is wrong.
Display shows:
Cal Calibration should be done.
CalAir Calibration Air should be done.
CalLiq Calibration Liquid should be done.
Set Settings of TYPE or DIAMETER is missing
err 1 No Air Sensor is detected. The reason for this can be wrongly connected Air Sensor, or
faulty Air Sensor.
err 2 The relative signal with Air is too strong (at low, medium or high sensitivity). err 2 is shown if
NAir is higher than 21-25%.
The reason for high NAir can be:
Calibration of AIR has been done with liquid in the Air Sensor. Or Wrong settings of Air
Sensor Type or Diameter. Or electric interference. Or a faulty Air Sensor. Or calibration of
LIQUID has been done with liquid having lots of bubbles or particles attenuating the
sound.
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