Diaphragm Seals Installation Consideration - YOKOGAWA EJX Series User Manual

3.2.1 EJ210
The transmitter is mounted on a process using its
high pressure side flange as shown in Figure 3.5. The
customer should prepare the mating flange, gasket, stud
bolts and nuts.
Gasket
Stud bolt
Nut
Figure 3.5 EJ210 Mounting
3.2.2 EJ118 and EJ438
Mount the diaphragm seals using the flanges as shown in
Figure 3.6. The mating flange, gasket, bolts and nuts are
to be procured by the customer.
Diaphragm
Bolt
The product is
Correctly install the diaphragm
shipped with these
seals on the high and low pressure
parts assembled.
sides of the process (The label on
each diaphragm seal is marked
HIGH or LOW).
Figure 3.6 Mounting the Diaphragm Seals
F0305.ai
Flange
Nut
ød
Gasket
F0306.ai
<3. Installation>
3.3 Diaphragm Seals Installation
Consideration
IMPORTANT
• When measuring the liquid level of the tank, the
minimum liquid level (zero point) must be set to a
level at least 50 mm above the center of the high
pressure side diaphragm seal (see Figure 3.7).
• Correctly install the diaphragm seals on the high
and low pressure sides of the process, checking
the label on each seal.
• To avoid measuring error duets temperature
difference between the two diaphragm seals,
capillary tube must be bound together. The
capillary tube must be securely fixed to the tank
wall to prevent movement by wind or vibration.
If the capillary tube is too long, loosely coil the
extra tube portion (coil diameter of 300 mm or
more) and secure the coiled tube with a clamp.
IMPORTANT
Install the sealed diaphragm
so that the shank positions
downward.
Figure 3.7 Installing the Diaphragm Seals to a
Tank
19
Low
pressure
side
Minimum
liquid level
High
pressure
side
50 mm minimum
The transmitter should
be installed as low as
possible below the
position where the high
pressure side
diaphragm seal is
installed.
F0307.ai
IM 01C25A01-01E
3