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<Read Me First>
IM 01W02E02-11EN
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Installation of an Explosion Protected Instrument
If a customer makes a repair or modification to an explosion protected instrument and the
instrument is not restored to its original condition, its explosion protected construction may be
compromised and the instrument may be hazardous to operate. Please contact Yokogawa
before making any repair or modification to an instrument.
CAUTION
The installation of the devices should be carried out by the engineers or other professional per-
sonnel of the related expertise. The installation should not be carried out by operators or other
unprofessional personnel.
CAUTION
This instrument has been tested and certified as being explosion protected. Please note
that severe restrictions apply to this instrument’s construction, installation, external wiring,
maintenance and repair. A failure to abide by these restrictions could make the instrument a
hazard to operate.
WARNING
• A modification of the equipment would no longer comply with the construction described in
the certificate documentation.
• To preserve the safety of Flameproof equipment requires great care during mounting,
wiring, and piping. Safety requirements also place restrictions on maintenance and repair
activities. Please read the following sections very carefully.
NOTE
• The front and rear cover are locked by an Allen head bolt (a shrouding bolt) on Flameproof
type instruments. When the shrouding bolt is driven clockwise by an Allen wrench, it is going
in and cover lock is released, and then cover can be opened by hand.
• When a cover is closed, it is the must turn the shrouding bolt counterclockwise and lock the
cover. Tighten the shrouding bolt to a torque of 0.7 N·m.
Shrouding bolt
F02.ai
