Bedienungsanleitung Yokogawa DYA Vortex Flow Converter (Seite 169 von 174) (Englisch)

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(5) Gaps between joint surfaces

The physical distance between two mating

surfaces, or differences in diameters if the mating

surfaces are cylindrical.

Note: The permissible sizes of gaps between joint surfaces,

the path length of a joint surface and the number of joint

threads are determined by such factors as the enclosure’s

internal volume, joint and mating surface construction,

and the explosion classiﬁ cation of the speciﬁ ed gases and

vapours.

4. Installation of Flameproof Apparatus

(1) Installation Area

Flameproof apparatus may be installed, in

accordance with applicable gases, in a hazardous

area in Zone 1 or 2, where the speciﬁ ed gases are

present. Those apparatus shall not be installed in a

hazardous area in Zone 0.

Note: Hazardous areas are classiﬁ ed in zones based upon

the frequency of the appearance and the duration of an

explosive gas atmosphere as follows:

Zone 0: An area in which an explosive gas atmosphere

is present continuously or is present for long

periods.

Zone 1: An area in which an explosive gas atmosphere is

likely to occur in normal operation.

Zone 2: An area in which an explosive gas atmosphere

is not likely to occur in normal operation and if it

does occur it will exist for a short period only.

(2) Environmental Conditions

The standard environmental condition for the

installation of ﬂ ameproof apparatus is limited to

an ambient temperature range from –20°C to

+40°C (for products certiﬁ ed under Technical

Criteria). However, some ﬁ eld-mounted

instruments may be certiﬁ ed at an ambient

temperature up to +60°C as indicated on the

instrument name plates. If the ﬂ ameproof apparatus

are exposed to direct sunshine or radiant heat

from plant facilities, appropriate thermal protection

measures shall be taken.

5. External Wiring for Flameproof

Apparatus

Flameproof apparatus require cable wiring for

their electrical connections. For cable wiring, cable

glands (cable entry devices for ﬂ ameproof type) to

wiring connections shall be attached. All non-live

metal parts such as the enclosure shall be securely

grounded. For details, refer to the “USER’S

GUIDELINES for Electrical Installations for

Explosive Gas Atmospheres in General Industry,”

published in 1994.

(1) Cable Wiring

• For cable wiring, cable glands (cable entry

devices for ﬂ ameproof type) speciﬁ ed or

supplied with the apparatus shall be directly

attached to the wiring connections to complete

sealing of the apparatus.

• Screws that connect cable glands to the

apparatus are those for G-type parallel pipe

threads (JIS B 0202) with no sealing property.

To protect the apparatus from corrosive gases

or moisture, apply nonhardening sealant

such as liquid gaskets to those threads for

waterprooﬁ ng.

• Speciﬁ c cables shall be used as recommended

by the “USER’S GUIDELINES for Electrical

Installations for Explosive Gas Atmospheres in

General Industry,” published in 1994.

• In necessary, appropriate protective pipes

(conduit or ﬂ exible pipes), ducts or trays shall

be used for preventing the cable run (outside

the cable glands) from damage.

• To prevent explosive atmosphere from being

propagated form Zone 1 or 2 hazardous

location to any different location or non-

hazardous location through the protective pipe

or duct, apply sealing of the protective pipes in

the vicinity of individual boundaries, or ﬁ ll the

ducts with sand appropriately.

• When branch connections of cables is made,

a ﬂ ameproof or increased-safety connection

box shall be used. In this case, ﬂ ameproof or

increased-safety cable glands meeting the

type of connection box must be used for cable

connections to the box.

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