OTT SVR 100, Руководство по эксплуатации

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10 Troubleshooting
Sensor not responding to RS-485 interface
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Sensor correctly connected to a data logger with SDI-12-input (master)?
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Correct terminal assignment.
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Supply voltage polarity reversed?
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Correct terminal assignment.
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Supply voltage < 9 V or > 27 V?
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Correct supply voltage level (check length and cross section of
connecting cable).
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Can the supply voltage used deliver1 A output current?
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Use a suitable supply voltage.
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Is the supply voltage a DC voltage?
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Only operate the sensor with DC voltage.
Measured values are incorrect or missing
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Sensor (front panel, Radom) soiled?
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Carefully clean sensor; see Chapter 7, Performing maintenance work .
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Obstructions inside or in the immediate vicinity of the radar sensor footprint?
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Remove obstructions.
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Sensor tilt angle in permitted range (20° … 60°)?
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Correct tilt angle.
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Distance to measuring point in permitted range (1 … 50 m)?
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Optimise installation location.
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Alignment of sensor not parallel to flow direction?
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Optimise alignment.
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Installation point of sensor not stable (e.g. continuous significant
fluctuations of bridge)?
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Optimise installation location.
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Large metallic surfaces close to the radar sensor footprint (e.g. sheet piling)?
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Optimise installation point.
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Measuring point is not suitable for measurement of the surface flow velocity;
see Chapter 5.1?
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Change measuring point.
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Measured values are explicitly incorrect during precipitation events, with "away
from sensor" alignment?
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Change alignment to "towards sensor".
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In addition for all potential faults:
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Check "Signal quality index" and "Vibration index".
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