Affixing The Teflon Film - YOKOGAWA DPharp EJXC80A User Manual

IMPORTANT
• Confirm that there is no gap between the ring and the process-detector section after they are mounted
on the process flange. A gap can lead to a sudden, explosive release of process fluids.
• When mounting or removing the ring, take care not to tilt the pressure detector downward as the ring
can slip off and cause injury.
• When re-mounting the ring, use the new spiral gasket as shown in below table.
Table 4.3 Spiral Gasket for Pressure Detector Section Side*
Gasket size
100 120 t4.5 For 3-inch
ø ×ø ×
100 120 t4.5 For 3-inch
ø ×ø ×
100 120 t4.5 For 3-inch
ø ×ø ×
70 90 t4.5 For 2-inch
ø ×ø ×
70 90 t4.5 For 2-inch
ø ×ø ×
70 90 t4.5 For 2-inch
ø ×ø ×
60 75 t4.5 For 1 1/2-inch
ø ×ø ×
60 75 t4.5 For 1 1/2-inch
ø ×ø ×
60 75 t4.5 For 1 1/2-inch
ø ×ø ×
*: Filler materials
General use, oil-prohibited use : PTFE
High temperature use : inorganic paper
**: For oil-prohibited use (Option code: /K31, /K35)
4.11 Affixing the Teflon Film
The FEP Teflon option includes a teflon film and
fluorinated oil. Before mounting the transmitter to
the process flange, affix the teflon film as follows:
IMPORTANT
1) Position the diaphragm 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
diaphragm 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 optimum
performance. 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. However, do not lay too much
stress on the diaphragm, as it may cause a
deform of the diaphragm.
5) Position the gasket on the Teflon film.
6) Mount the transmitter onto the process
flange.
Specifications
General use
High temperature use
Oil-prohibited use**
General use
High temperature use
Oil-prohibited use**
General use
High temperature use
Oil-prohibited use**
<4. Installation>
Hoop material/Parts No.
SUS316 SUS316L
F9350SV F9350SW
F9990BK F9990BN
F9970XF F9970XG
F9350ST F9350SU
F9990BJ F9990BM
F9970XD F9970XE
F9346ZH F9970XA
F9990BH F9990BL
F9970XB F9970XC
Fluorinated oil
[PART No. : F9145YN]
PART No.
F9347XA
F9347YA *1
*1: F9347YD when Diaphragm Material code is
"H" and Sealing Face Material code is "S."
Figure 4.20 Affixing the Teflon Film
4-12
Hastelloy C-276
F9990BR
--------
--------
F9990BQ
--------
--------
F9990BP
--------
--------
Teflon film
Diaphragm
Gasket area
Prosess Flange size
3 inch (80mm)
2 inch (50mm)
F0420.ai
IM 01C25W01-01EN