Yokogawa AXFA14G/C - Manual (Page 6)

IM 01E20C02-01E 1-2
1. INTRODUCTION
IMPORTANT
An IMPORTANT sign denotes that attention is
required to avoid damage to the instrument or
system failure.
NOTE
A NOTE sign denotes information necessary for
essential understanding of operation and fea-
tures.
Protective grounding terminal
Functional grounding terminal
(This terminal should not be used as a protective
grounding terminal.)
Alternating current
Direct current
1.1 Using the Magnetic
Flowmeter Safely
WARNING
(1) Installation
• Installation of the magnetic flowmeter must be
performed by expert engineer or skilled person-
nel. No operator shall be permitted to perform
procedures relating to installation.
• The magnetic flowmeter is a heavy instrument.
Be careful that no damage is caused to person-
nel through accidentally dropping it, or by
exerting excessive force on the magnetic
flowmeter. When moving the magnetic flowme-
ter, always use a trolley and have at least two
people carry it.
• When the magnetic flowmeter is processing hot
fluids, the instrument itself may become ex-
tremely hot. Take sufficient care not to get
burnt.
• Where the fluid being processed is a toxic
substance, avoid contact with the fluid and
avoid inhaling any residual gas, even after the
instrument has been taken off the piping line for
maintenance and so forth.
• Do not apply excessive weight, for example, a
person stepping on the magnetic flowmeter.
• All procedures relating to installation must
comply with the electrical code of the country
where it is used.
(2) Wiring
• The wiring of the magnetic flowmeter must be
performed by expert engineer or skilled person-
nel. 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
specified 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
• 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.
• Be sure to set parameters as “Protect” on the
write protect function after finish of parameter
setting work.
Under extremely rare case, the infra-red
switches may respond unexpectedly in such
conditions as sticking ball of water or extrane-
ous 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 flowmeter installa-
tion place.
Either to illuminate or stop illuminating the infra-
red switches by the flashlight may cause the
mis-reaction.
Refer to Chapter 6 “Menu P: Parameter Protec-
tion Items” and section “10.2.2” how to use the
write protect function in detail.
(4) Maintenance
• Maintenance of the magnetic flowmeter 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.
• Always conform to maintenance procedures
outlined in this manual. If necessary, contact
Yokogawa.