KROHNE LEVEL-SONIC BM90 Series Installation And Operating Instructions Manual page 13

D O N O T A I M T H R O U G H
H O L E S I N T H E T A N K .
K E E P T R A N S D U C E R
P E R P E N D I C U L A R
T O L I Q U I D .
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
bore of Standpipe
3 " ( 75mm)
4 " (100mm)
6 " (150mm)
8 " (200mm)
12" (300mm)
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.
I N S T A N D P I P E S .
O T H E R O B S T R U C T I O N S .
Maximum length
of Standpipe
300mm
300mm
400mm
600mm
600mm
T E M P E R A T U R E C O M P E N S A T I O N
P R O B E S O U T O F D I R E C T
S U N L I G H T
M20 X 1.5
22 (0.86")
P V C
flange
dia 95 (3.74")
Isolation kit
13