VEGA VEGABAR 24 - Manual (Page 24)

24 VEGABAR 24
Instrument modification
6.2 Exchange of the hygienic form
seal on VEGABAR 24
The ceramic measuring cell is sealed radially
gapfree by a form seal on VEGABAR 24
process pressure transmitter with hygienic
fitting LA or LB. This form seal (material
EPDM-FDA
1) approved) can be exchanged
by the user without re-adjustment being
necessary. The criteria and time periods for
such an exchange are defined by process
conditions and hygienic requirements.
Important:
Only use the original VEGA replacement part,
article no. 2.17 775 as seal ring!
Note the below procedure when exchanging
the seal.
Exchange procedure:
1 Pressure transmitter should be unpres-
surized (switch off process pressure or
empty vessel).
2 Loosen the hexagonal screw (1) with
SW 46 by turning anticlockwise
Note!
The process connection (2) (i.e. compression
nut) must not be loosened!
3 Completely loosen pressure screw and
remove the pressure transmitter from the
process connection
Note:
Should the pressure transmitter turn by loos-
ening the pressure screw, it can be held by
the adapter (3) with a screw driver (SW 36).
4 Slightly lift the form seal (5) (with a knife
or something similar) and loosen it from
the ceramic measuring cell
5 If the form seal (5) does not cover the
measuring cell, it should be carefully
removed from the process connection.
Installation procedure:
6 Pull a new form seal (5) over the measur-
ing cell (the conical end should point
towards the process connection!).
7 Insert the pressure transmitter carefully
into the process connection by turning
clockwise.
8 Tighten hexagonal screw (1) with SW 46
to its fixed position (45 Nm).
9 Return the housing (4) of the pressure
transmitter to its original position
Exchange of the form seal is now finished,
ensure appropriate disposal of the removed
seal.
1) Food and Drugs Administration
1 Hexagon pressure screw
2 Process connection
3 Adapter
4 Housing
5 Form seal