Yokogawa PK200 - Manual (Page 23)

IM 21B03D01-01E 6-1
6. MAINTENANCE
6. MAINTENANCE
6.1 Overview
The PK200 converter components are structured as
units to allow easy maintenance.
This chapter describes cleaning of each component and
part replacement to be conducted for PK200 mainte-
nance.
This converter is a high-precision instrument and thus,
read the following description carefully before per-
forming maintenance.
For maintenance, also see the operation items in
Chapter 5.
CAUTION
Cautions for intrinsically safe apparatus
Intrinsically safe apparatus shall be repaired by
the manufacturer.
Cautions for flameproof type instruments
(a) Flameproof type instruments must be, as a
rule, removed to a non-hazardous area for
maintenance and be disassembled and
reassembled to the original state. For details,
see “Installation and Operating Precautions
for TIIS Flameproof Equipment” later in this
manual.
(b) On the flameproof type instruments the cover
is locked by a setscrew. When a setscrew is
driven clockwise by an Allen wrench, it is
going in and cover lock is released, and then
the cover can be opened. When a cover is
closed it should be locked by a setscrew
without fail.
6.2 Periodic Inspection
Periodic inspection is required for maintaining normal
plant operations. During periodic inspection, pay
special attention to the following.
(1) Is the appearance normal?
(2) Is there pressure leakage from the converter or its
peripheral piping?
(3) Is drainage present, or is there adhesion of dust or
oil, in the air supply system?
Periodically clean the restrictor and nozzle flapper,
which are easily subject to contamination. The
following describes their cleaning.
6.2.1 Cleaning the Restrictor
Remove the restrictor shown in Figure 6.1 using a
screw driver and thread a wire with 0.3mm dia. into
the restrictor for cleaning.
Figure 6.1 Restrictor Removal
Figure 6.2 Cleaning the Restrictor
6.3 Parts Replacement
6.3.1 Replacing the Screen Filter
If the mesh filter located at the rear of the supply
pressure connection and output air pressure connection
is clogged, use a sharp-edged tool such as tweezers to
remove the filter and replace it with a new one.
Screen filter
F0603.EPS
Figure 6.3 Removing the Screen Filter (OUT Side)