22 Ultrasound Controller Manual
6. Level Sensor Mode
In Level Sensor mode a level sensor is attached at the bottom of the container and measures the
continuous liquid level. The level sensor is attached outside the container and senses through the
bottom (no hole is needed).
A velocity sensor can also be attached, measuring sound velocity.
Two levels sensors and two velocity sensors can be connected to one Ultrasound Controller.
Quick start guide
Install sensors according to instructions on page 23 and instructions in the Level Switch
Manual.
Connect cables, see page 6 or 7 and 22
Switch on external power supply.
Read about navigating the menu system, page 8
Display show: SET sensor MODE. Press MENU button to scroll to Press SELECT for
LevelSensormode. Confirm by pressing SELECT button.
Go to SETTINGS to set parameters, page 24.
Calibrate level sensor 1: Fill container to at least 70%. Select Calibrate LIQUID Level Sensor 1
and Press SELECT button one second.
Empty container. Select Calibrate AIR Level Sensor 1 and Press SELECT button one second.
Do the calibration for level sensor 2 also. The calibration order air/liquid can be mixed.
Go to SHOW DATA to check calibrated values, page 25.
Ready.
Functional Description
The level sensor is attached under the container. It sends ultrasound through the bottom and
through the liquid, towards the surface where the sound bounces back to the level sensor.
Ultrasound Controller measures the time for the echo and calculates the level.
Measurement accuracy is dependent on liquid sound velocity which can vary with liquid and
temperature. A velocity sensor can be attached on the containers vertical wall sending ultrasound
through the wall and through the liquid. Ultrasound Controller measures the echo that bounces on
the opposite container wall (or other reflecting surface inside the container). The velocity sensor
can also make level measurement. It can tell whether there is liquid or air behind the wall and this
can be used for increased reliability, see SETTINGS.
In order to measure properly the echo should be as loud as possible. The echo is attenuated by
travelling through the bottom and travelling through the liquid. Small bubbles and particles in the
liquid causes further attenuation. The echo can disappear completely if it does not bounce back to
the level sensor. Unmixed liquids having different sound velocities can cause refraction of the
sound beam so it does not bounce back to the level sensor. How quiet the echo has become can
be checked in SHOW DATA.
Either Level Switch KS or Level Switch LS can be used as level sensor and velocity sensor. Level
Switch RS cannot be used for Level Sensor.
Connecting the level sensor
The cable from the level sensor and velocity sensor should connect directly to the Ultrasound
Controller. (Yellow and green cable are not used.) The cable screen must always be connected to
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