10 Troubleshooting
Sensor not responding to RS-485 interface
䊳
Sensor correctly connected to a data logger with SDI-12-input (master)?
➝
Correct terminal assignment.
䊳
Supply voltage polarity reversed?
➝
Correct terminal assignment.
䊳
Supply voltage < 9 V or > 27 V?
➝
Correct supply voltage level (check length and cross section of
connecting cable).
䊳
Can the supply voltage used deliver1 A output current?
➝
Use a suitable supply voltage.
䊳
Is the supply voltage a DC voltage?
➝
Only operate the sensor with DC voltage.
Measured values are incorrect or missing
䊳
Sensor (front panel, Radom) soiled?
➝
Carefully clean sensor; see Chapter 7,
Performing maintenance work
.
䊳
Obstructions inside or in the immediate vicinity of the radar sensor footprint?
➝
Remove obstructions.
䊳
Sensor tilt angle in permitted range (20° … 60°)?
➝
Correct tilt angle.
䊳
Distance to measuring point in permitted range (1 … 50 m)?
➝
Optimise installation location.
䊳
Alignment of sensor not parallel to flow direction?
➝
Optimise alignment.
䊳
Installation point of sensor not stable (e.g. continuous significant
fluctuations of bridge)?
➝
Optimise installation location.
䊳
Large metallic surfaces close to the radar sensor footprint (e.g. sheet piling)?
➝
Optimise installation point.
䊳
Measuring point is not suitable for measurement of the surface flow velocity;
see Chapter 5.1?
➝
Change measuring point.
䊳
Measured values are explicitly incorrect during precipitation events, with "away
from sensor" alignment?
➝
Change alignment to "towards sensor".
䊳
In addition for all potential faults:
➝
Check "Signal quality index" and "Vibration index".
24
Summary of Contents for SVR 100
Page 1: ...English Operating Instructions Surface Velocity Radar OTT SVR 100...
Page 2: ...We reserve the right to make technical improvements...
Page 34: ......
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