Yokogawa EJX115A - Manual (Page 23)

<3. Installation>
21
IM 01C25A01-01E
3.4.2 Mounting to Process Flange
Tighten the bolts to completely close the gap between the
ring and the pressure detector section.
The mating flange, gasket, stud bolts and nuts are to
procured by the customer.
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Ring
Diaphragm
Pressure-detector
section
Gasket
Mating flange
Spiral gasket
Figure 3.10 Mounting to Process Flange
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 3.1 Spiral Gasket for Pressure Detector
Section Side*
Part number Size Description
F9350SV ш100Чш120Чt4.5 For 3-inch flange
F9970XF ш100Чш120Чt4.5 For 3-inch flange**
F9350ST ш70Чш90Чt4.5 For 2-inch flange
F9970XD ш70Чш90Чt4.5 For 2-inch flange**
F9346ZH ш60Чш75Чt4.5 For 1 1/2-inch flange
F9970XB ш60Чш75Чt4.5 For 1 1/2-inch flange**
*: Material; 316SST (Hoop), PTFE Teflon (Filler)
**: For oil-prohibited use (Option code: / K1, /K2, /K5, /K6)
3.5 Affixing the Teflon Film
IMPORTANT
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:
1) Position the diaphragm seal so that the diaphragm
is in an 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.
5) Position the gasket on the Teflon film.
6) Mount the transmitter onto the process flange.
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EJ210 F9347YD
EJ118
EJ438
F9347YA
2B
(50A)
F9347XA 3B(80A)
Teflon film
PART No.
Diaphragm
Fluorinated oil
[PART No. : F9145YN]
Gasket area
Figure 3.11 Affixing the Teflon Film
In
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