APPLICATIONS WITH STANDPIPES
In many solids and liquid applications, access to the vessel must be made via a
standpipe. In such cases, Milltronics can provide flange mounted transducers that will
readily mate to the standpipe.
The maximum standpipe length that can be used without additional near blanking
( P-5 not greater than 0.3 m ) is 200 mm ( 8" ). For greater standpipe lengths, up to
30" long, near blanking must be extended to 150 mm ( 6" ) beyond the end of the pipe.
The preferred dimension when selecting a standpipe arrangement is a 100 mm ( 4" )
diameter pipe, 300 mm ( 12" ) long. Near blanking would be set at 460 mm ( 18" ).
Standpipe Example
Referring to Volume Application \ Volume Example, if the transducer were mounted to
a 150 mm diameter flanged standpipe 0.5 m long, instead of a 1 m diameter manhole,
the following will be required :
select :
P-5 enter ".65", near blanking
0.50 m ( standpipe length )
+0.15 m ( blanking past pipe )
0.65 total blanking distance
to re-enter run mode.
RUN
CAL
■
PL-443 6 – 42
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