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<Read Me First>
IM 01W02E01-11EN
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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 instru
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ment is not restored to its original condition, its explosion protected construction may be com-
promised and the instrument may be hazardous to operate. Please contact Yokogawa before
making any repair or modification to an instrument.
CAUTION
This instrument has been tested and certified as being explosion protected. Please note that se
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vere 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.
CAUTION
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.
CAUTION
• 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
