AQ M-Tech AB Ultrasound Controller Manual 39
™™™ gel sensor is not existing
cal calibration (of liquid) needs to be done
set some parameter settings are missing
err gel sensor is disconnected
Example: Gel Sensor 1 is detecting GEL, Gel Sensor 2 is
detecting AIR, Gel Sensor is out of range or close to be out of
range, Gel Sensor 4 is disconnected, Relay1 is closed.
SETTINGS
Through the SETTINGS-menu the parameters of the Gel Sensor can be set.
Select SET Type to set it according to how many sensors are connected, or set to Level Switch QS.
For GF90 set it to GS1 if one is connected and GS1,GS2 if two are connected and so on.
Select SET ECHO-DISTANCE to set the distance between the Level Switch and opposite reflecting
surface inside the container. For GF90 set it to 90mm.
Select SET GEL-TYPE to set the the amount of attenuation of the gel. It depend on gel type and
frequency. (Streamline SP: 7dB/m at 2MHz,14dB/m at 4MHz) (tungsten gel: 40dB/m at
2MHz,80dB/m at 4MHz, note that high attenuation of tungsten gel makes it difficult to measure
high gel concentrations).
Select SET GEL-THRESHOLD to set the gel concentration for detection. (note that depending on
measuring distance and gel type, high concentrations of gel can be difficult to measure)
Select SET FREQUENCY to set the measurement frequency. For GF90 it must be set to 4MHz.
For sensors placed on the container wall frequency should be tested to suit the container wall
thickness resonance. Try 2,0MHz 2,2MHz 1,3MHz 1,5MHz and 1,7MHz and check Signal dB
for each to find which frequency gives the strongest echo and choose that frequency.
Select Liquid Sensor SET WR THRESHOLD to set threshold of the Liq WR sensor. This is used to
measure the presence of air. For GF90 a suitable value is 7dB. A good setting is half the value of
Liq WR sensor dB with air (see SHOW DATA). For sensors placed on the container wall it works
only if the wall is plastic.
Select SET RELAY to set how the relays act. Each of the four relays has one contact connection
and they share a common connection (at power off the relays are open).
Relay can be closed or open with detection of gel in a sensor. (If WR THRESHOLD is set then air
can also be detected and whenever air is detected it prevents any relay-indication of gel)
Relay can be closed when air is detected. (WR THRESHOLD must then be set for this sensor)
Relay can be closed when the sensor is disconnected.
Relay can be closed when the sensor is out of range. Out of range means the echo is rather weak
and measurements is a bit unreliable. This can happen either when gel concentration is high or
when there is air.
Select SET mA output A or SET mA output B to set the 4-20mA outputs.
1,5mA/GelDetectn means each gel sensor of the level switch type that detects gel adds 1,5mA to the
combined output so 4 gel sensors indicating gel will output 10mA.
Relative attenu. 1mA=-4dB/m means the output increases 1mA for each additional 4dB/m of
attenuation.
Gelconcentration 1mA=1% means the output is proportional to gelconcentration: 0% = 4mA, 16% =
20mA. Gelconcentration will not be affected by any WR-measurements of air and therefore since
air gives high attenuation of the echo it will show as high concentration of gel.
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