VEGA VEGABAR 44 HART - Инструкция (Страница 40)

4 0 VEGABAR 44 (HART®)
6.3 Exchange of the hygienic form
seal on VEGABAR 44
The ceramic measuring cell is sealed by a
gapless, radial form seal on VEGABAR 44
process pressure transmitter with hygienic
fitting LA or LB. This form seal (material
EPDM-FDA
1) approved) can be exchanged
by the user without readjustment being nec-
essary. The criteria and time periods for such
an exchange are defined by process condi-
tions and hygienic requirements.
Important:
Only use the original VEGA replacement part,
article no. 2.17 775 as seal ring!
Note the following procedure when exchang-
ing the seal.
Removal procedure:
1 Pressure transmitter should be unpressu-
rized (switch off process pressure or
empty vessel).
2 Loosen the hexagon head screw (46 mm
across flats) (1) by turning counter-
clockwise
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 wrench (36 mm across
flats).
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 re-
moved from the process connection.
Installation procedure:
6 Pull a new form seal (5) over the measur-
ing cell (the conical end should point to-
wards the process connection!).
7 Insert the pressure transmitter carefully
into the process connection by turning
clockwise.
8 Tighten hexagon head screw (46 mm) (1)
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
Модификации прибора