AQ Elteknik AB Ultrasound Controller Manual 15
measurement (VLthld<6). Air Sensor with diameter less than 22mm may have difficulty
measuring at very low sensitivity. Change SENSITIVITY to low, medium or high instead.
err 4 - The absolute signal with Liquid is too weak (at low, medium or high sensitivity). err 4 is
shown if the calibrated data with Liquid, NLiq is lower than 31dB for SAC and FCS or 19dB
for SAC Ex and FCS Ex or lower than 18dB for PAC or FCP.
The reason for this can be: Calibration of LIQUID has been done with air or liquid having lots
of bubbles or particles attenuating the sound. Or wrong settings of Air Sensor Type or
Diameter. Or Air Sensor is wrongly connected. Or Air Sensor is faulty
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