VEGA D84 Hydrostatic pressure transmitter - Manual (Page 41)

Pressure transmitter D84 41
Instrument modification
7 Instrument modification
7.1 Retrofitting the adjustment insert
Such a retrofitting can be necessary, e.g.
when a pressure transmitter with factory
settings must be adapted to changed meas-
urement conditions.
Note the following retrofit procedure:
• remove the outdated terminal insert
• mount new adjustment insert
• set up pressure transmitter acc. to chapter
"5 Setup"
Remove the outdated terminal insert
1 Separate pressure transmitter from
power supply.
2 Unscrew cover of the connection housing
or loosen the screws on the cover of the
external housing.
3 Remove cover.
4 Loosen connection cables on the terminal
insert.
5 Loosen the three screws of the terminal
insert.
6 Remove terminal insert and pull out plug
connection (to do this, bend locking nose
carefully towards housing centre).
Mount new adjustment insert
7 Plug the connection into the adjustment
insert (must snap in).
8 Place adjustment insert in the housing
and fasten with three screws.
9 Connect the connection cables to the
terminals.
10 Fasten the cover.
11 Reconnect the pressure transmitter to
power supply.
Setup of pressure transmitter
see chapter "5 Setup".
7.2 Exchange of hygienic form seal
on D84
On the hygienic connections AA, CA, LA, LB,
RA, RB, TA of pressure transmitter D84, the
ceramic measuring cell is radially, gaplessly
sealed with a form seal. This form seal (mate-
rial EPDM-FDA) can be exchanged by the
user without the need of a fresh adjustment.
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!
Please note the following exchange proce-
dure.
Removal procedure:
• Pressure transmitter should be unpressu-
rized (switch off process pressure or
empty vessel).
• 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!
• Turn the adapter (3) below the pressure
transmitter housing with a wrench (with
across flats, 36 mm) briefly to the left (to
loosen the seal).
• Pull the complete pressure transmitter on
the housing (1) out of the process connec-
tion by carefully turning to the left.
• Slightly lift the form seal (5) and loosen
from the ceramic measuring cell.
• If the form seal (5) does not completely
encircle the measuring cell, it must be
carefully removed from the process
connection.