YOKOGAWA DP harp EJ 110 Series, Руководство пользователя

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<8. Maintenance>
8-5
IM 01C25B01-01E
8.4.3 Cleaning and Replacing the Capsule
Assembly
This subsection describes the procedures for
cleaning and replacing the capsule assembly. (See
figure 8.4.)
CAUTION
Cautions for Flameproof Type Transmitters
Users are prohibited by law from modifying the
construction of a flameproof type transmitter. If
you wish to replace the capsule assembly with
one of a different measurement range, contact
Yokogawa.
The user is permitted, however, to replace a
capsule assembly with another of the same
measurement range. When doing so, be sure to
observe the following.
• The replacement capsule assembly must
have the same part number as the one being
replaced.
• The section connecting the transmitter and
capsule assembly is a critical element in
preservation of flameproof performance, and
must be checked to verify that it is free of
dents, scratches, and other defects.
• After completing maintenance, be sure to
securely tighten the setscrews that fasten
the transmitter section and pressure-detector
section together.
■ 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
cleaning.
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
EJ

110

, EJ

310

, EJ

430

EJ

120

Wetted parts material code
S, L H,M,T,A,D,B,W
Torque(N·m)
{kgf·m}
17*
{1.7}
40
{4.1}
40
{4.1}
*: 40 for measurement span code F, option code /HD or /HD2.
Model
EJ

130

EJ

440

Bolts & nuts material code
G, C J G, C J
Torque(N·m)
{kgf·m}
90
{9.2}
110
{11.2}
70
{7.1}
100
{10.2}
3) After the pressure-detector section has been
reassembled, 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.
7) After completing reassembly, adjust the zero
point and recheck the parameters.