Replacing The Process Connector Gaskets - YOKOGAWA DpharpEJX vigilantplant EJX110 User Manual

Removing the Capsule Assembly
IMPORTANT
Exercise care as follows when cleaning the
capsule assembly.
• Handle the capsule assembly with care, and be
especially careful not to damage or distort the
diaphragms that contact the process fluid.
• Do not use a chlorinated or acidic solution for
cleaning.
• Rinse thoroughly with clean water after clean-
ing.
1) Remove the CPU assembly as shown in subsection
8.4.2.
2) Remove the two setscrews that connect the
transmitter section and pressure-detector section.
3) Remove the hexagon-head screw and the stopper.
4) Separate the transmitter section and pressure-
detector section.
5) Remove the nuts from the four flange bolts.
6) While supporting the capsule assembly with one
hand, remove the cover flange.
7) Remove the capsule assembly.
8) Clean the capsule assembly or replace with a new
one.
Reassembling the Capsule Assembly
1) Insert the capsule assembly between the flange
bolts, paying close attention to the relative positions
of the H (high pressure side) and L (low pressure
side) marks on the capsule assembly.
Replace the two capsule gaskets with new gaskets.
2) Install the cover flange on the high pressure side,
and use a torque wrench to tighten the four nuts
uniformly to a torque shown below.
Model EJX110A,
EJX310A,
EJX430A
Torque(N·m) 17 {1.7}
{kgf·m}
3) After the pressure-detector section has been reas-
sembled, a leak test must be performed to verify
that there are no pressure leaks.
4) Reattach the transmitter section to the pressure-
detector section.
Reattach the stopper with the hexagon-head screw.
5) Tighten the two setscrews. (Tighten the screws to a
torque of 1.5 N·m)
6) Install the CPU assembly according to subsection
8.4.2.
EJX130A, EJX440A
Bolts and nuts material code
G, C J
70 {69} 100 {98}
T0803.EPS
7) After completing reassembly, adjust the zero point
and recheck the parameters.
Transmitter section
Capsule gasket
Flange bolt
Cover flange
Figure 8.4 Removing and Mounting the Pressure-
detector Section
IMPORTANT
If you remove the drain/vent plugs when disas-
sembling EJX130A and EJX440A transmitters,
install the plugs again before reassembling the
cover flanges with the capsule assmbly.
8.4.4 Replacing the Process Connector
Gaskets
This subsection describes process connector gasket
replacement. (See figure 8.5.)
(a) Loosen the two bolts, and remove the process
connectors.
(b) Replace the process connector gaskets.
(c) Remount the process connectors. Tighten the bolts
securely and uniformly to a torque shown below,
and verify that there are no pressure leaks.
EJX110A, EJX130A,
Model
EJX310A, EJX430A
Torque(N·m)
{kgf·m}
8-5
8. MAINTENANCE
Setscrew
Nut
Pressure-detector section
EJX440A
C capsule D capsule
39 to 49 {4 to 5}
IM 01C25B01-01E
F0804.EPS
49 to 59
{5 to 6}
T0805.EPS