Vega VEGABAR 44 Profibus PA Bedienungsanleitung PDF herunterladen (Seite 34)

34 VEGABAR 44 (Profibus PA)

Instrument modification

6.3 Exchange of the hygienic form

seal

The ceramic measuring cell is sealed by a

gapless, radial form seal on VEGABAR 44

process pressure transmitter with hygienic

fitting. This form seal can be exchanged by

the user without readjustment being neces-

sary. 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

as seal ring!

Note the following procedure when exchang-

ing the seal.

Removal procedure:

1 Pressure transmitter should be unpres-

surized (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 (SW 46).

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 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 Hexagon pressure screw

2 Process connection

3 Adapter

4 Housing

5 Form seal

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