14
4 Mounting
VEGAFLEX 82 • 4 … 20 mA/HART - two-wire
44222-EN-170220
You can find detailed information on the process conditions in chapter
"
Technical data
" as well as on the type label.
4.2 Mounting instructions
Mount VEGAFLEX 82 in such a way that the distance to vessel instal-
lations or to the vessel wall is at least 300 mm (12 in). In non-metallic
vessels, the distance to the vessel wall should be at least 500 mm
(19.7 in).
During operation, the probe must not touch any installations or the
vessel wall. If necessary, fasten the probe end.
In vessels with conical bottom it can be advantageous to mount the
sensor in the center of the vessel, as measurement is then possible
nearly down to the lowest point of the bottom. Keep in mind that
measurement all the way down to the tip of the probe may not be pos-
sible. The exact value of the min. distance (lower dead band) is stated
in chapter "
Technical data
".
Fig. 2: Vessel with conical bottom
Plastic vessel/Glass vessel
The guided microwave principle requires a metallic surface on the
process fitting. Therefore, in plastic vessels, etc., use an instru-
ment version with flange (from DN 50) or place a metal sheet
(ø > 200 mm/8 in) beneath the process fitting when screwing it in.
Make sure that the plate has direct contact with the process fitting.
When using the probes without metal vessel wall, e.g. in plastic
vessels, the measured value can be influenced by strong electromag-
netic fields (emitted interference according to EN 61326: class A).
Use a probe in coax version for applications in liquids.
Installation position
Type of vessel