Yokogawa EJA438 - Manual (Page 21)

IM 1C22J1-01E 4-3
4. INSTALLATION
4.4 Affixing the Teflon Film
The FEP Teflon option includes a teflon film and
fluorinated oil.
Before mounting the diaphragm seal to the process
flange, affix the teflon film as follows :
IMPORTANT
(1) Position the diaphragm seal so that the
diaphragm is in a upward position.
(2) Pour the fluorinated oil on the diaphragm and
gasket area covering it completely and
evenly. Be careful not to scratch the dia-
phragm or change the its shape.
(3) Affix the teflon film over the diaphragm and
gasket area.
(4) Next, carefully inspect the cover and try to
identify any entrapped air between the
diaphragm and the teflon film. The air must
be removed to ensure accuracy. If air
pockets are present, use your fingers to
remove the air by starting at the center of the
diaphragm and work your way out.
(5) Place the gasket with the teflon film and affix
to the process flange.
Teflon film
Diaphragm
Fluorinated oil
[PART No.: F9145YN]
Gasket area
Diaphragm seal
PART No.
F9347XA
F9347YA
Process flange size
For 3inch (80 mm)
For 2inch (50 mm)
F0405.EPS
Figure 4.4.1 Affixing the Teflon Film
4.5 Rotating Transmitter Section
The DPharp transmitter section can be rotated in 90
°
segments.
(1) Remove the two Allen screws that fasten the
transmitter section and pressure-detector section,
using the Allen wrench supplied with the transmit-
ter.
(2) Rotate the transmitter section slowly in 90
°
segments.
(3) Tighten the two Allen screws.
IMPORTANT
Do not rotate the transmitter section more than
180
°
.
F0406.EPS
Rotate 90
°
or 180
°
segments
Rotate 90 ° or 180 °
segments
Transmitter section
Pressure-detector section
Conduit
connection
Zero-adjustment
screw
Figure 4.5.1 Rotating Transmitter Section