YOKOGAWA DPharp EJXC40A, Руководство пользователя

Страница: 109 / 150

<8. Maintenance>
8-6
IM 01C25W05-01EN
8.4.3 Cleaning and Replacing the Capsule
Assembly
CAUTION
Precautions regarding Frameproof Type
Transmitters
Users are prohibited from modifying the
construction of a flameproof type transmitter. If
you want to replace the capsule assembly with
another with a different measurement range,
contact Yokogawa.
If you want to replace the capsule assembly with
another with the same measuring range, only do
so after checking the following items.
• Replace the capsule assembly with another
with the same specifications.
• 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 shrouding bolts that
fasten the transmitter section and pressure-
detector section together.
The procedure for cleaning or replacing the capsule
assembly is provided below.
■ Removing the Capsule Assembly
IMPORTANT
When cleaning the capsule assembly, note the
following items.
• 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 and dry completely.
1. Remove the CPU assembly according the
instructions in subsection 8.4.2.
2. Remove the two setscrews that connect the
transmitter section and pressure-detector
section, and remove the stopper set screws and
the stopper. (See Figure 8.4.)
3. Separate the transmitter section from the
pressure-detector section.
4. Clean or replace the capsule assembly.
■ Assembling the Capsule Assembly
1. Attach the transmitter section to the pressure-
detector section.
2. Fasten the stopper’s setscrews. Fasten the two
shrouding bolts. (Tighten to a torque of 1.5 N·m
{1 kgf·m}.)
3. Attach the CPU assembly according the
instructions in subsection 8.4.2.
4. After assembly, be sure to perform zero point
adjustment and check the parameters.
Transmitter section
Pressure-detector section
Setscrew
Stopper
Stopper
F0804.ai
Figure 8.4 Attaching and Removing the Pressure-
Detector Section