18 Ultrasound Controller Manual
Electric interference will show itself as Ndata being unstable with Air in the Air Sensor. To
minimize the risk of interference it is important that sources of interference like frequency
inverters should use shielded cables between inverter and motor. Also any unshielded
part of the cable between the Air Sensor 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.
err 3 There is not enough signal difference between air and liquid (at very low or very very low
sensitivity). err 3 is shown if Very Low sensitivity threshold is not high enough for reliable
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, CCS Ex and FCS Ex or lower than 18dB for PAC and 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
SetErr Air Sensor DAP, DAT and APS can not be used together with another type of Air Sensor
(this is due to an internal configuration common to both air sensors). When TYPE is set to
DAP, DAT or APS on one air sensor, the other air sensor must also be set to DAP, DAT or
APS or No Air Sensor.
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