<2. Notes on Handling>
2-6
IM 01C50B01-01E
(1) Technical Data
a) ATEX Intrinsically Safe “ia”
Caution for ATEX Intrinsically safe “ia”
Note 1. Model YTA110/KU2, YTA310/KU2 and
YTA320/KU2 temperature transmitters for
potentially explosive atmospheres:
• No. KEMA 02ATEX1026 X
• Applicable Standard: EN 60079-0:2012,
EN 60079-11:2012, EN 60079-26:2007
• Type of Protection and Marking code: II 1 G Ex
ia IIC T4...T5 Ga
• Temperature Class: T5, T4
• Ambient Temperature: –40 to 70°C for T4,
–40 to 50°C for T5
• Enclosure: IP66/IP67 in accordance with
EN 60529
Note 2. Electrical Data
• In type of explosion protection intrinsic safety II
1 G Ex ia IIC only for connection to a certified
intrinsically safe circuit with following maximum
values:
• [Supply circuit]
Ui = 30 V
Ii = 165 mA
Pi = 900 mW
Effective internal capacitance, Ci = 20 nF
Effective internal inductance, Li = 730 μH
• [Sensor circuit]
Uo = 9 V
Io = 40 mA
Po = 90 mW
Max. allowed external capacitance, Co = 0.7μF
Max. allowed external inductance, Lo = 10 mH
• The above parameters apply when one of the
two conditions below is given:
- the total Li of the external circuit (excluding
the cable) is < 1% of the Lo value or
- the total Ci of the external circuit (excluding
the cable) is < 1% of the Co value.
• The above parameters are reduced to 50%
when both of the two conditions below are
given:
- the total Li of the external circuit (excluding
the cable) is ≥ 1% of the Lo value and
- the total Ci of the external circuit (excluding
the cable) is ≥ 1% of the Co value.
• The reduced capacitance of the external circuit
(including cable) shall not be greater than 1μF
for Group IIB and 600nF for Group IIC.
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
Note 5. Maintenance and Repair
• The instrument modification or parts
replacement by other than authorized
representative of Yokogawa Electric
Corporation is prohibited and will void ATEX
Intrinsically safe “ia” Certification.
Note 6. Special Conditions for Safe Use
WARNING
• Because the enclosure of the Temperature
Transmitter is made of aluminium, if it
is mounted in an area where the use of
category 1G apparatus is required, it must be
installed such, that, even in the event of rare
incidents, ignition sources due to impact and
friction sparks are excluded.
• Electrostatic charge may cause an explosion
hazard. Avoid any actions that cause the
generation of electrostatic charge, such as
rubbing with a dry cloth on coating face of
the product.
• If the equipment is affected by external
sources of heating or cooling from plant
facilities, make sure that the parts in contact
with the equipment or in the near vicinity of
the equipment do not exceed the ambient
temperature range of the equipment.
Transmitter
Supply
Safety Barrier *1
Hazardous Location
Nonhazardous Location
+
–
+
–
[Installation Diagram]
F0205.ai
Sensor
1
2
3
4
5
*1: In any safety barriers used the output current must be
limited by a resistor “R” such that Imaxout-Uz/R.
