AQ M-Tech AB Ultrasound Controller Manual 33
9. Gel Distance Mode
In Gel Distance mode, a Gel Distance Sensor measures the distance to the gelbed.
Ultrasound Controller GS72 must be used for this mode. One sensor can be attached.
Quick start guide
• Connect the gel distance sensor cable to GS72 terminal: Red to 8 white to 9 and shield to
11. Connect power supply to GS72 terminal: Plus 24V to 1 and minus to 2.
• Switch on external power supply.
• Read about navigating the menu system, page 9
• If display show: SET sensor MODE. Choose Press SELECT for GelDistance mode by scrolling with
MENU button and selecting with SELECT button.
• Go to SETTINGS see page 34 and set the parameter that need to be set.
• Calibrate with liquid: Fill container and make sure the distance to the gelbed is > 40mm and
there are no bubbles under the sensor. Select CALIBRATION with Liquid, and Press SELECT
button one second.
Functional Description
A Gel Distance Sensor sends ultrasound through the liquid, which then bounces back at the
gelbed surface. GS72 measures the echo and calculates the distance. The distance and echo
strength is shown on the display.
When gelbed is expanded the gelbed surface becomes diffuse and the measured distance will be
approximate. Also, the echo becomes weaker. When echo is weaker than 15dB the measurement
can be unreliable. Small bubbles and particles in the liquid also causes echoes. The sensor need
to be fairly horizontal (parallel to the gelbed surface) in order for the echo to bounce back
properly. Unmixed liquids having different sound velocities can cause refraction of the sound so it
does not bounce back to the sensor.
Measuring short distance (<20mm) can be difficult due to remaining vibrations inside the sensor.
The measurement technique is dependent on sound velocity which can vary with liquid and
temperature.
The mA output can be set to output distance (0% Level = 4mA, 100% Level = 20mA) or Signal
strength (0dB = 4mA, 85dB = 20mA). It is adviseable to check the signal strength also during
testing.
To Next Page
Loading...
Need help?
General