Instruction manual

7ML19981AK01 XPS/XCT Transducers– INSTRUCTION MANUAL Page 13
Liquid Applications - Standpipes
In many applications access must be made via a standpipe. In such cases, Milltronics
can provide factory bonded flanged transducers or split flange kit that will readily mate to
the flanged standpipe. Another option is to hang the transducer from a blind flange.
The standpipe length should be as short and the diameter as large as possible. As a rule
of thumb, the –3 dB cone of the sound beam should not intersect the standpipe wall in
applications opening into a vessel or larger area. Otherwise, additional blanking will be
required to compensate for the interference zone created by the opening.
Note: When using a stilling well, make sure there is no build-up, welds, couplings, or
other debris on the inside of the well wall. This can affect reliability of level
measurement
.
flanged
transducer
no
intersection
vessel
no additional blanking required
no additional blanking required
no additional blanking required
no vessel
nipple welded into
blind flange
transducer
sound beam
intersects
vessel
reflection at
interference zone
created by opening
near blanking extension of
150 mm (6") past end of
standpipe may be required.
nipple welded into
blind flange
transducer
transducer
can read
level inside
or below
standpipe
standpipe
end cut on a
45º angle
typically