VEGA VEGASON 71 - D - Manual (Page 10)

VEGASON 71 - D 10
2.6 Installation fault
2 Technical Information
Fault: Min. distance from sensor to h
max
not
maintained.
Problem: The upper range cannot be measured.
Solution: Correct min. distance of the sensor to 0,3 m.
Fault: Sensor is not directed vertically to the surface.
Problem: Sensor receives weak echoes.
Solution: Mount sensor vertically.
Fault: Strong heat fluctuations, e.g. sun.
Problem: The measuring accuracy is not constant.
Solution: Install a sun shield in the respective position.
Fault: Surface has foaming problem.
Problem: The surface of the foam is detected as level.
The measured value is wrong.
Solution: The used measuring principle is not suitable
and must be replaced e.g. by a hydrostatic
system (pressure transmitter).
Fault: Distance from sensor to h
max
too large.
Problem: Unreliable results due to very weak echoes.
Solution: Correct min. distance of the sensor to 0,3 m.
Fault: Sensor too close to the flume wall, i.e. not
mounted in the centre.
Problem: Build-up and rough flume walls cause
measuring problems.
Solution: Mount sensor in the centre of the flume.
> 300 mm
h max
< 300 mm
h max