Yokogawa EJA118 - Manual (Page 17)

IM 1C22H1-01E 2-9
2. HANDLING CAUTIONS
2.9.5 JIS Certification
JIS Flameproof and Intrinsically Safe Type
The model EJA Series pressure transmitters with
optional code /JF1 and /JS1, which have obtained
certification according to technical criteria for explo-
sion-protected construction of electric machinery and
equipment(Standards Notification No. 556 from the
Japanese Ministry of Labor) conforming to IEC
standards, are designed for hazardous areas where
explosive gases and/or inflammable vapors may be
present. [JIS Flameproof Type(optional code /JF1)
allows installation in Division 1 and 2 areas, and JIS
Intrinsically Safe Type(optional code /JS1) allows
installation in Division 0, 1, and 2 areas.]
To observe the safety of flameproof equipment requires
great care during mounting, wiring, and piping. Safety
requirements also place restrictions on maintenance
and repair activities. Users absolutely must read
“Installation and Operating Precautions for JIS Intrinsi-
cally Safe Equipment and Flameproof Equipment” at
the end of this manual.
CAUTION
(For JIS flameproof type without integral indicator)
When the fill fluid near the sensor part moves
from within, the instrument outputs a failure
signal either high or low of the specific signal. In
that case, generate the alarm to identify that the
failure signal is output since the event may
invalidate the flameproof approval.
If the optional integral indicator is equipped, the
indicator identifies the alarm on its display.
Therefore, no other alarm generation is neces-
sary.
Transmitter
Hazardous Location Nonhazardous Location
Power
Supply DCS
Display
4 to 20 mA DC 1 to 5 V DC
F0210.EPS
Figure 2.3 Example of using DCS (Distributed Control
System)
2.10 EMC Conformity Standards
For EMI (Emission): EN55011, AS/NZS 2064 1/2
For EMS (Immunity): EN50082–2
NOTE
YOKOGAWA recommends customer to apply
the Metal Conduit Wiring or to use the twisted
pair Shield Cable for signal wiring to conform the
requirement of EMC Regulation, when customer
installs the EJA Series Transmitters to the plant.