YOKOGAWA AXFA14G - Page 4

<1. Introduction>
3
IM 01E20A01-01EN
(2) Wiring
WARNING
• Thewiringofthemagnetic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speci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.
• The protective grounding must be connected
securely at the terminal with the
mark to avoid
danger to personnel.
(3) Operation
WARNING
• When opening the cover, wait for more than 10
minutes after turning off the power. Only expert
engineer or skilled personnel are permitted to
open the cover.
• Do not open the cover in wet weather or humid
environment. When the cover is open, stated
enclosure protection is not applicable.
• Besuretosetparametersas“Protect”onthewrite
protectfunctionafternishofparametersetting
work.
Under extremely rare case, the infra-red switches
may respond unexpectedly in such conditions as
sticking ball of water or extraneous substances on
the surface of display panel glass according to the
principle of infra-red switch operation.
Its probability rises in such cases as sticking
rain water by storm or other similar situation and
washingupworknearowmeterinstallationplace.
Either to illuminate or stop illuminating the infrared
switchesbytheashlightmaycausethemis-
reaction.
Refer to Section 6.3 how to use the write protect
function in detail.
(4) Maintenance
WARNING
• Maintenanceofthemagnetic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.
• When opening the cover, wait for more than 10
minutes after turning off the power.
• Do not open the cover in wet weather or humid
environment. When the cover is open, stated
enclosure protection is not applicable.
• When maintaining the instrument, refer to user's
manual as listed in Table 1.1. Do not perform the
maintenance that is not described in the manual. If
necessary, contact Yokogawa.
• Care should be taken to prevent the build up of
dirt, dust or other substances on the display panel
glass or name plate. If these surfaces do get dirty,
wipe them clean with a soft dry cloth.
(5) Explosion Protected Type Instrument
WARNING
• Magneticowmeterswiththemodelname
AXFC and AXFA14C are products which
havebeencerti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.Sufcientcaremustbetaken,asany
violation of the limitations may cause dangerous
situations.
Be sure to read Chapter 10 before handling the
instruments. The description in Chapter 10 is prior
to the other description in this user’s manual.
For ATEX or IECEx explosion proof type, be sure
to read IM 01E20A01-11EN.
For TIIS explosion proof type, be sure to
read“INSTALLATIONANDOPERATING
PRECAUTIONS FOR TIIS FLAMEPROOF
EQUIPMENT”attheendofthismanual.
• Only trained persons use this instrument in the
industrial location.
• The protective grounding
must be connected to
a suitable IS grounding system.
• Take care not to generate mechanical spark when
access to the instrument and peripheral devices in
hazardous locations.
1
Introduction