YOKOGAWA DP harp EJX Series - Disassembly and Reassembly; Replacing the Integral Indicator

<8. Maintenance>
8-3
IM 01C25B01-01E
8.4 Disassembly and
Reassembly
This section describes procedures for disassembly
and reassembly for maintenance and component
replacement.
AlwaysturnOFFpowerandshuto󰀨andrelease
pressures before disassembly. Use proper tools for
all operations. Table 8.2 shows the tools required.
Table 8.2 Tools for Disassembly and Reassembly
Tool Quantity Remarks
Phillips
screwdriver
1 JIS B4633, No. 2
Slotted
screwdriver
1
Allen wrenches 3 JIS B4648
One each, nominal 3, 4 and
2.5 mm Allen wrenches
Wrench 1 Widthacrossats,17mm
Torque wrench 1
Adjustable
wrench
1
Socket wrench 1 Widthacrossats,16mm
Socket driver 1 Widthacrossats,5.5mm
Tweezers 1
CAUTION
Precautions for ATEX Flameproof Type
Transmitters
• Flameproof type transmitters must be, as
a rule, removed to a non-hazardous area
for maintenance and be disassembled and
reassembled to the original state.
• Ontheameprooftypetransmittersthetwo
covers are locked, each by an Allen head
bolt (shrouding bolt). When a shrouding bolt
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 shrouding bolt without fail. Tighten the
shrouding bolt to a torque of 0.7 N·m.
Shrouding Bolt
Shrouding Bolt
F0802.ai
Figure 8.2 Shrouding Bolts
8.4.1 Replacing the Integral Indicator
CAUTION
Cautions for Explosion-proof/Flameproof
Type Transmitters
Users are prohibited by law from modifying the
constructionofaexplosion-proof/ameprooftype
transmitter. This would invalidate the agency
approval for the use of the transmitter in a rated
area.
It follows that the user is prohibited from using
aexplosion-proof/ameprooftypetransmitter
with its integral indicator removed, or from
adding an integral indicator to a transmitter. If
suchmodicationisabsolutelyrequired,contact
Yokogawa.
This subsection describes the procedure for
replacinganintegralindicator.(Seegure8.3)