YOKOGAWA AXFA14C User Manual

<INSTALLATION AND OPERATING PRECAUTIONS FOR TIIS FLAMEPROOF EQUIPMENT>
87
EX-B03E
6. Maintenance of Flameproof
Apparatus
Tomaintaintheameproofapparatus,dothefollowing.
(Fordetails,seeChapter10“MAINTENANCE
OF EXPLOSION-PROTECTED ELECTRICAL
INSTALLATION”intheUSER’SGUIDELINESfor
Electrical Installations for Explosive Gas Atmospheres in
General Industry.)
(1) Maintenance servicing with the power on.
Flameproof apparatus shall not be maintenance-serviced
with its power turned on. However, in cases where
maintenance servicing is to be conducted with the power
turned on, with the equipment cover removed, always
use a gas detector to check that there is no explosive
gas in that location. If it cannot be checked whether an
explosive gas is present or not, maintenance servicing
shall be limited to the following two items:
(a) Visual inspection
 Visuallyinspecttheameproofapparatus,metal
conduits, and cables for damage or corrosion, and
other mechanical and structural defects.
(b) Zero and span adjustments
These adjustments should be made only to the extent
that they can be conducted from the outside without
opening the equipment cover. In doing this, great care
must be taken not to cause mechanical sparks with
tools.
(2) Repair
Iftheameproofapparatusrequiresrepair,turnoff
the power and transport it to a safety (non-hazardous)
location. Observe the following points before attempting
to repair the apparatus.
(a) Make only such electrical and mechanical repairs
as will restore the apparatus to its original condition.
Fortheameproofapparatus,thegapsandpath
lengths of joints and mating surfaces, and mechanical
strength of enclosures are critical factors in explosion
protection. Exercise great care not to damage the
joints or shock the enclosure.
(b) If any damage occurs in threads, joints or mating
surfaces, inspection windows, connections between
the transmitter and terminal box, shrouds or clamps,
or external wiring connections which are essential
inameproofness,contactYokogawaElectric
Corporation.
CAUTION
Do not attempt to re-process threaded connections or
renishjointsormatingsurfaces.
(c) Unlessotherwisespecied,theelectricalcircuitryand
internal mechanisms may be repaired by component
replacement, as this will not directly affect the
requirementsforameproofapparatus(however,
bear in mind that the apparatus must always be
restored to its original condition). If you attempt to
repairtheameproofapparatus,company-specied
components shall be used.
(d) Before starting to service the apparatus, be sure
to check all parts necessary for retaining the
requirementsforameproofapparatus.Forthis,
check that all screws, bolts, nuts, and threaded
connections have properly been tightened.
(3) Prohibitionofspecicationchangesand
modications
Donotattempttochangespecicationsormake
modicationsinvolvingadditionoforchangesin
external wiring connections.
7. Selection of Cable Entry
Devices for Flameproof Type
CAUTION
Thecableglands(cableentrydevicesforameproof
type)conformingtoIECStandardsarecertied
incombinationwiththeameproofapparatus.
So,Yokogawa-speciedcableentrydevicesfor
ameprooftypeshallbeusedtomeetthisdemand.
References:
(1) TypeCerticateGuideforExplosion-Protected
Construction Electrical Machinery and Equipment
(relating to Technical Standards Conforming to
International Standards), issued by the Technical
InstitutionofIndustrialSafety,Japan
(2) USER’S GUIDELINES for Electrical Installations
for Explosive Gas Atmospheres in General Industry
(1994),issuedbytheJapaneseMinistryofLabour,
the Research Institute of Industrial Safet

YOKOGAWA AXFA14C Specifications

General

Brand	YOKOGAWA
Model	AXFA14C
Category	Measuring Instruments
Language	English