KROHNE BM 90 EN - Manual (Page 13)

13
KEEP TRANSDUCER
PERPENDICULAR
TO LIQUID.
KEEP TRANSDUCERS AND
TEMPERATURE COMPENSATION
PROBES OUT OF DIRECT
SUNLIGHT
DO NOT AIM THROUGH
HOLES IN THE TANK
.
AVOID ROUGH EDGES
IN STANDPIPES
.
AVOID INFLOWS OR
OTHER OBSTRUCTIONS
.
CAUTION: AVOID THE FOLLOWING TRANSDUCER INSTALLATION FAULTS
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 stand-
pipes.
BLANKING: Parameter 5 should always be set at
least 150 mm longer than the length of
the standpipe.
STANDPIPE should be in accordance with the follo-
wing table
DIMENSIONS:
Flange size and minimum Maximum length
bore of Standpipe of Standpipe
3" ( 75mm) 3 0 0 m m
4" (100mm) 3 0 0 m m
6" (150mm) 4 0 0 m m
8" (200mm) 6 0 0 m m
12" (300mm) 6 0 0 m m
e.g. : Using a 4" flanged transducer would require the
standpipe length to be no more than 300mm and Pr.5 set
at 450 mm minimum.
The inside of the pipe and joint with vessel top must
be clean and free of any obstructions, seams or
welds.
Isolation kit
dia 95 (3.74")
M20 X 1.5
22 (0.86")
155 (6.10")
P V C
flange