Yokogawa ADMAG AXR Bedienungsanleitung PDF herunterladen (Seite 192)

IM 01E30D01-01EN

(2) Flameproof Metal Conduit Wiring

• Fortheameproofmetalconduitwiringor

insulated wires shall be used as recommended

by the USER’S GUIDELINES for Electrical

Installations for Explosive Gas Atmospheres in

General Industry, published in 1994.

• F

or conduit pipes, heavy-gauge steel conduits

conforming to JIS C 8305 Standard shall be

used.

• Flameproofsealingttingsshallbeusedinthe

vicinity of the wiring connections, and those

ttingsshallbelledwithsealingcompoundsto

complete sealing of the apparatus. In addition,

topreventexplosivegases,moisture,orame

caused by explosion form being propagated

through the conduit, always provide sealing

ttingstocompletesealingoftheconduitinthe

following locations:

(a) In the boundaries between the hazardous

and non-hazardous locations.

(b) In the boundaries where there is a different

lassicationofhazardouslocation.

• For the connections of the apparatus with a

conduit pipe or its associated accessories,

G-type parallel pipe threads (JIS B 0202) shall

beusedtoprovideaminimumofve-thread

engagement to complete tightness. In addition,

since these parallel threads do not have sealing

property, nonhardening sealant such as liquid

gaskets shall thus be applied to those threads

for ensuring waterproofness.

• Ifmetalconduitsneedexibility,useameproof

exiblettings.

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.

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