Yokogawa EJA438 - Manual (Page 16)

IM 1C22J1-01E 2-8
2. HANDLING CAUTIONS
c. IEC (KEMA) Type of Protection “n”
Caution for IEC (KEMA) Type of Protection “n.”
Note 1. Model EJA Series pressure transmitters
with optional code /KU1 for potentially
explosive atmospheres.
• Type of Protection and Marking Code:
Ex nA IIC T4
• Temperature Class: T4
• Process Temperature: 120
°
C max.
• Ambient Temperature: –40 to 60
°
C
Note 2. Electrical Data
• Supply and output circuit
≤
30 V dc, 165 mA
(terminals + and –)
Note 3. Installation
• All wiring shall comply with local installation
requirements. (refer to the installation diagram)
Note 4. Maintenance and Repair
• The instrument modification or parts replacement
by other than authorized representative of
Yokogawa Electric Corporation is prohibited and
will void KEMA Type of Protection “n” Certifica-
tion.
Power Supply
(Zone 2 only)
Transmitter
Supply
Nonhazardous Location
[Installation Diagram]
Hazardous Location
+
–
+
–
F0209.EPS
Ratings of the Power Supply as follows;
Maximum Voltage: 30 V
Maximum Current: 165 mA
d. CENELEC (KEMA) Intrinsically Safe Type/
CENELEC (KEMA) Flameproof Type/IEC
(KEMA) Type of Protection “n”
Model EJA Series pressure transmitters with
optional code /KU1 can be selected the type of
protection (CENELEC (KEMA) Intrinsically
Safe or CENELEC (KEMA) Flameproof or IEC
(KEMA) Type of Protection “n”) for use in
hazardous locations.
Note 1. For the installation of this transmitter,
once a particular type of protection is
selected, any other type of protection
cannot be used. The installation must be
in accordance with the description about
the type of protection in this instruction
manual.
Note 2. In order to avoid confusion, unnecessary
marking is crossed out on the label other
than the selected type of protection when
the transmitter is installed.
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)