AQ Elteknik AB Ultrasound Controller Manual 33
cal - Calibration has not been done. Calibration must be done with Liquid.
set - Some settings are missing.
If the relay does not change but the display changes between Liquid, Air and Gel — Wrong
setting of RELAY.
err - During calibration the echo signal was weak: The reason can be: Calibration was done
without liquid or with gel. Or the Level Switch is not attached correctly to the container. There
is a tiny air-gap between the Level Switch and the container. Or DISTANCE to reflecting wall is
set wrong. Or the echo is reflected in a direction where it does not reach the Level Switch. Or
something obstructing lies between the Level Switch and the reflecting wall. Or the container
wall does not let through enough sound. Try a different FREQUENCY. Or wrong connection or
faulty Level Switch. Select Test Gel Sensor then test the Level Switch and its connection.
Electric interference can show itself as the attenuation and gel concentration not being able to get
high enough with gel. To minimize the risk of interference it is important that sources of
interference (like frequency inverters) should use screened cables between inverter and motor.
Also any unscreened part of the cable between the Level Switch and Ultrasound Controller should
be short. If ex-barriers are used, Ex-barriershields must be used especially if there is more than
one Ultrasound Controller.
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