<4. Installation>
4-6
IM 01C25W05-01EN
4.5 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
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, and
mount the transmitter onto the process
flange.
Teflon film
Part No.
F9347YA [2 inch (50 mm)]
F9347XA [3 inch (80 mm)]
Diaphragm
Fluorinated oil
Part No.: F9145YN
Gasket contact surface
F0412.ai
Diaphragm seal section
Figure 4.14 Affixing the Teflon Film
4.6 Tank Spud Mounting Method
A tank spud is used to joint a tank and an extended
diaphragm.
It is imperative for sanitary use that the contact
parts of the transmitter and the tank are securely
and tightly sealed in order to avoid the process fluid
spouting and the decomposition by stagnant fluid.
The construction of the tank spud using a O-ring
eliminates the clearance between the contact parts
and ensures the tightness.
F0417.ai
Tank spud
in Tank
(A)
Transmitter
body
O-ring
Tank spud
(Detail of A)
Tank
ISO Clamp
Transmitter
side
Welding
Figure 4.15 Details of Transmitter Mounting
Welding
When welding a tank spud to a tank, take great care
not to change its shape by heat. The deformation of
the shape eventually makes a dead space between
the transmitter and the tank spud, resulting in the
process fluid spouting and the decomposition the
coupling by stagnant fluid.
Mounting Position
Set the center of the tank spud to a level at least
50mm above the minimum liquid level (zero point).
IMPORTANT
• Clean thoroughly the tank after the welding
the tank spud to the hole on a tank.
• Be sure that the surface is finished smoothly
by using a grinder except the hole is made
by the machinery cutting.
