VEGA VEGAPULS 43 4 … 20 mA; HART compact sensor - Manual (Page 17)

VEGAPULS 43 – 4 … 20 mA 17
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Guide tube in existing surge or bypass tubes
Extended guide tube
Guide tube
To increase the min. distance, the guide tube
can project out of the surge or bypass tube.
This can be done by welding a flat welding
flange on the outside of the extended guide
tube. In both cases, an appropriate breather
hole is necessary.
Tube connection protrudes
Additional connection in the bypass tube in one plane
Use of guide tubes
In case of very rough inner surfaces in exist-
ing bypass tubes (e.g. due to corrosion),
large connecting tube openings, as well as
bypass tubes with more than 100 mm inner
diameter, the use of a guide tube inside the
existing bypass tube is recommended. This
reduces the noise level and increases meas-
urement reliability considerably. The flange of
the guide tube can be easily mounted as a
sandwich flange between vessel and sensor
flange.
Mounting and installation