Appendix 1
Ref: REFLEX/SCANFLEX MANUAL
EDITION 1: JULY ’97 49
POINTS TO BE AVOIDED WHEN INSTALLING TRANSDUCERS.
Figure 1.
Standpipe Installations
In many applications access to a vessel must be made via a standpipe. However, it is
necessary to observe some basic rules when fitting transducers into standpipes.
BLANKING: Parameter 6 should always be set at least 150mm longer
than the length of the standpipe.
STANDPIPE should be in accordance with the following table
DIMENSIONS:
Minimum bore Maximum length
of Standpipe of Standpipe
3" ( 75mm) 300mm
4" (100mm) 300mm
6" (150mm) 400mm
8" (200mm) 600mm
12" (300mm) 600mm
e.g. Using a 4" flanged transducer would require the standpipe length to be no more than
300mm and Pr.6 set at 450mm minimum.
The inside of the pipe and joint with vessel top must be clean and free of any
obstructions, seams or welds.
KEEP TRANSDUCER
PERPENDICULAR
TO LIQUID.
DO NOT AIM THROUGH
HOLES IN THE TANK
.
AVOID ROUGH EDGES
IN STANDPIPES
.
AVOID INFLOWS OR
OTHER OBSTRUCTIONS
.
KEEP TRANSDUCERS AND
TEMPERATURE COMPENSATION
PROBES OUT OF DIRECT
SUNLIGHT
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