Yokogawa digitalYEWFLO (DY-FF) - Manual (Page 8)

<1. INTRODUCTION>
1-2
IM 01F06F00-01EN
1.1 Using This Instrument Safety
(1) Installation
WARNING
• Installation of the vortex fl owmeter must
be performed by expert engineer or skilled
personnel. No operator shall be permitted to
perform procedures relating to installation.
• The vortex fl owmeter must be installed within
the specifi cation conditions.
• The vortex fl owmeter is a heavy instrument.
Be careful that no damage is caused to
personnel through accidentally dropping
it, or by exerting excessive force on the
vortex fl owmeter. When moving the vortex
fl owmeter, always use a trolley and have at
least two people carry it.
• When the vortex fl owmeter is processing
hot fl uids, the instrument itself may become
extremely hot. Take suffi cient care not to get
burnt.
• Where the fl uid being processed is a toxic
substance, avoid contact with the fl uid and
avoid inhaling any residual gas, even after
the instrument has been taken off the piping
line for maintenance and so forth.
• Do not open the cover in wet weather or
humid environment. When the cover is open,
stated enclosure protection is not applicable.
• Do not apply excessive weight, for example,
a person stepping on the vortex fl owmeter.
• All procedures relating to installation must
comply with the electrical code of the country
where it is used.
(2) Wiring
WARNING
• The wiring of the vortex fl owmeter must
be performed by expert engineer or skilled
personnel. No operator shall be permitted to
perform procedures relating to wiring.
• When connecting the wiring, check that the
supply voltage is within the range of the
voltage specifi ed for this instrument before
connecting the power cable. In addition,
check that no voltage is applied to the power
cable before connecting the wiring.
(3) Operation
WARNING
• Do not open the cover in wet weather or
humid environment. When the cover is open,
stated enclosure protection is not applicable.
• When opening the cover, wait for more than
3 minutes after turning off the power.
(4) Maintenance
WARNING
• Maintenance of the vortex fl owmeter should
be performed by the trained personnel
having knowledge of safety standard. No
operator shall be permitted to perform any
operations relating to maintenance.
• Do not open the cover in wet weather or
humid environment. When the cover is open,
stated enclosure protection is not applicable.
• When opening the cover, wait for more than
3 minutes after turning off the power.
• Always conform to maintenance procedures
outlined in this manual. If necessary, contact
Yokogawa.
(5) Explosion Protected Type Instrument
WARNING
• The instruments are products which have
been certifi ed as explosion proof type
instruments. Strict limitations are applied
to the structures, installation locations,
external wiring work, maintenance and
repairs, etc. of these instruments. Suffi cient
care must be taken, as any violation of the
limitations may cause dangerous situations.
Be sure to read Chapter 10 “EXPLOSION
PROTECTED TYPE INSTRUMENT”
before handling the instruments. For TIIS
fl ameproof type instruments, be sure to
read “INSTALLATION AND OPERATING
PRECAUTIONS FOR TIIS FLAMEPROOF
EQUIPMENT” at the end of manual for the
vortex fl owmeter (IM 01F06A00-01EN).
• Only trained persons use this instrument in
the industrial location.
• Take care not to generate mechanical
spark when access to the instrument and
peripheral devices in hazardous locations.