Manual
<2. Notes on Handling>
2-11
IM 01C50B01-01E
2.7.4 TIISCertication
a) TIIS Flameproof Type
The model YTA /JF3 temperature transmitter, which
has obtained certication according to technical
criteria for explosion-protected construction of
electric machinery and equipment (Standards
Notication No.556 from the Japanese Ministry of
Labor) conforming to IEC standards, is designed
for hazardous areas where explosive gases and/or
inammable vapors may be present. (This allows
installation in Division 1 and 2 areas) To preserve
the safety of ameproof 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 TIIS Flameproof Equipment” at the end of this
manual.
WARNING
The terminal cover should not be opened at least
for three minutes after the power is turned off.
The terminal section of the ameproof YTA
series is made of resin-lled, explosion-
protected construction. The technical standards
for this ameproof construction require that
the possibility of explosion resulting from a
prospective short-circuit current*
1
of up to 4000
A be prevented even for cases when external
power supply circuits are short-circuited
accidentally.
Install a fuse or a circuit breaker having a
breaking capacity of at least 4000 A in the higher-
order power line connected to the YTA series.
The breaking capacity refers to the upper limit
of current that can be cut off. Normally, a fuse
or a circuit breaker having a breaking capacity
of greater than 5000 A is used in power supply
circuits. Conrm that this is true with your factory.
No extra measures need be taken after the
conrmation.
Note that the rated current of the YTA series in
terms of explosion protection is 4 to 20 mA; keep
the input current of the YTA series within the
appropriate range.
*1: Refers to a current that ows when a fuse in a circuit is
substituted with a connecting metal piece having virtually
no impedance and the circuit is then shorted. For AC
circuits, this current is represented by a root-mean-square
value (JIS C6575).
2.7.5 IECExCertication
a) IECEx Intrinsic safety “ia”
Caution for IECEx Intrinsic safety “ia”.
Note 1. Model YTA110/SU2, YTA310/SU2, and
YTA320/SU2 temperature transmitters are
applicable for use in hazardous locations:
• No
. Certicate: IECEx KEM 09.0032X
• Applicable standard: IEC60079-11:2011,
IEC60079-0:2011, IEC60079-26:2006
• Type of Protection and Marking Code:
Ex ia IIC T4...T5 Ga
• Ambient Temperature:
-40 to 70°C for T4, -40 to 50°C for T5
• Enclosure: IP67
Note 2. Electrical Data
• [Supply circuit (Terminals: + and –)]
Ui = 30 V, Ii = 165 mA, Pi = 900 mW
Effective internal capacitance, Ci = 20 nF
Effective internal inductance, Li = 730 μH
• [Sensor circuit (Terminals: 1 to 5)]
Uo = 9 V Io = 40 mA Po = 90 mW
Max. allowed external capacitance, Co = 0.7 μF
Max. allowed external inductance, Lo = 10 mH
Note 3. Installation
• All wiring shall comply with local installation
requirements. (Refer to the installation diagram)
Note 4. Operation
• Keep strictly the “WARNING” on the label on
the transmitter.
WARNING: POTENTIAL ELECTROSTATIC
CHARGING HAZARD. SEE
USER’S MANUAL BEFORE USE.
Note 5. Maintenance and Repair
• The instrument modication or parts
replacement by other than authorized
representative of Yokogawa Electric
Corporation is prohibited and will void IECEx
Certication.
Note 6. Conditions of Certication
• Because the enclosure of the Temperature
Transmitter is made of aluminium, if it is mounted
in zone 0, it must be installed such, that, even in
the event of rare incidents, ignition sources due
to impact and friction sparks are excluded.
• Avoid any actions that cause the generation of
electrostatic charge on the non-metallic parts,
such as rubbing with a dry cloth on coating face
of product.