VEGA D98 Pressure transmitter - Manual (Page 11)

Pressure transmitter D98 11
1 Pressure transmitter
2 Headless screw (avoids overwinding and must not be
removed)
3 Adapter
4 Hexagon screw
5 Form seal
6 Process connection
Instrument modification
6 Instrument modification
6.1 Exchange of hygienic form seal
In the hygienic connections of pressure
transmitter D98, the ceramic measuring cell is
gaplessly sealed with a radial, form seal.
This form seal (material EPDM-FDA) can be
exchanged by the user without a fresh ad-
justment being necessary. The criteria and
the time intervals for such an exchange of the
seal are generally defined by the process
and hygienic requirements.
Important:
Use only original replacement seals from
VEGA, article no. 2.17 775!
Please note the following exchange proce-
dure.
Removal procedure:
1 Pressure transmitter should be
unpressurized (switch off process pres-
sure or empty vessel)
2 Loosen the hexagon pressure screw (4)
(width across flats, 46 mm) by turning to
the left.
Note!
The process connection (6) (e.g. compres-
sion nut) must not be loosened!
3 Turn the adapter (3) below the pressure
transmitter housing with a spanner (with
across flats, 36 mm) slightly to the left
(loosen the seal).
4 Hold onto the housing (1), pull the entire
pressure transmitter out of the process
connection by carefully turning to the left.
5 Slightly lift the form seal (5) and loosen it
from the ceramic measuring cell.
6 If the form seal (5) does not completely
encircle the measuring cell, the remaining
part must be carefully removed from the
process connection.
Installation procedure:
1 Place the new form seal (5) over the meas-
uring cell (the conical side must mate with
the process connection).
2 Turning it lightly clockwise, insert the pres-
sure transmitter carefully into the process
connection.
3 Tighten hexagon pressure screw (4) (width
across flats, 46 mm) (45 Nm).
4 Turn the housing (1) of the pressure trans-
mitter to the original position.
The exchange of the form seal is now fin-
ished; the removed seal must be properly
disposed of.
1
4
2
3
5
6