Yokogawa EJX430B - Manual (Page 70)

<9. Maintenance>
9-5
IM 01C27B01-01EN
3) Align and engage the zero-adjustment screw
pin with the groove on the bracket on the CPU
assembly. Then insert the CPU assembly
straight onto the post in the amplifier case.
4) Tighten the two bosses. Mount the RF
assembly, and the integral indicator (refer to
subsections 9.4.1 and 9.4.2).
IMPORTANT
Confirm that the zero-adjustment screw pin is
placed properly in the groove on the bracket prior
to tightening the two bosses. If it is not, the zero-
adjustment mechanism will be damaged.
5) Replace the cover.
9.4.4 Cleaning and Replacing the Capsule
Assembly
CAUTION
Precautions for the intrinsic safety explosion
prevention type instrument
Modification is not permitted by the user for
intrinsic safety explosion prevention type
transmitter. Consult our company when you want
to exchange capsule assembly.
Execute it only at time when the following points
were confirmed for exchange capsule assembly
in the same range of measurement.
• Exchanged capsule assembly uses the one
of the same specification.
• Tighten Setscrew to fix the transmitter
section and the pressure detector section
surely after ending maintenance.
This subsection describes the procedures for
cleaning and replacing the capsule assembly. (See
figure 9.3.)
■ 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 with clean water after cleaning, please
dry until completely dry.
1) Remove the CPU assembly as shown in
subsection 9.4.3.
2) Remove the five setscrews, the stopper bolt,
and the stopper 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
EJX110B, EJX310B, EJX430B
Wetted parts material code
S (except for
Measurement
span code F)
H,M,T,A,D,B or
S (Measurement
span code F)
Torque(N·m)
{kgf·m}
17
{1.7}
40
{4.1}