24 Ultrasound Controller Manual
1 105 mm Level
2 cal 1234
strength is shown in dB. Small adjustments can be made of the angle of the level sensor and the
thickness of the silicone layer in order to achieve maximum echo strength. Calibrate liquid once
more. Then keep the level sensor in place until the silicone cures.
Mounting the velocity sensor
A velocity sensor (= Level Switch) must be mounted so it can measure the echo bouncing at the
opposite container wall. Preferably it is mounted quite low on the container since it needs liquid to
measure the velocity. How well sound passes through the wall depend on the material and
thickness, see above. The velocity sensor can also be used as a Level Switch, detecting low level.
See Level Switch manual how to glue the velocity sensor.
Container top
If the container is full with liquid all the way up to the top the ultrasound will bounce off the top
instead of the liquid surface. If the inside of the top is not horizontal, the echo may not bounce
back to the level sensor.
Level Sensor start-screen
When power is applied, the Level Sensor start-screen is displayed showing LevlSens on first
line to the right signifying this is Level Sensor start-screen. On the second line to the right is
written 1234 which shows the state of each of the four relays. A light digit on dark signifies a
closed relay.
To the left, the digit 1 signifies Level Sensor 1, followed by the measured level in %. If no
measurement can be done there is text with information instead. On the second line, the digit 2
signifies Level Sensor 2.
cal calibration needs to be done of air or liquid
set parameters need to be set
--- not active
err error – see troubleshooting
> xx level is over xx mm (over 100%)
< xx level is below xx mm
Example: Level Sensor 1 105mm
Level Sensor 2 need to be calibrated
SETTINGS
Through the SETTINGS-menu the parameters of the Level Sensor can be set.
Select SET 100% Level to set the level which correspond to 100% level. A level over 170% will not
be measured at all.
Select SET 0% Level to set the level xx which correspond to 0% level. Any level below 0% will be
shown as <xx.
Select SET Liquid Sound Velocity This parameter is used if sound velocity measurement cannot be
done because of lack of velocity sensor. It should be set to the correct velocity for the liquid.
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