IM 01C50B01-01E
2-6
2. NOTES ON HANDLING
Note 5. Special condition for safe use
• 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 source due to impact
and friction sparks are excluded.
Transmitter
Supply
Safety Barrier
*1
Hazardous
Location
Nonhazardou
Location
+
–
+
–
[Installation Diagram]
F0208.EPS
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.
b) CENELEC ATEX (KEMA) Flameproof Type
Caution for CENELEC ATEX (KEMA) Flameproof
Type
Note 1. Model YTA110/KU2, YTA310/KU2 and
YTA320/KU2 temperature transmitters for
potentially explosive atmospheres:
• No. KEMA 02ATEX2155
• Type of Protection and Marking Code: II 2G EEx d
IIC T5, T6
• Temperature Class: T5, T6
• Ambient Temperature: –40 to 80°C for T5, –40 to
75°C for T6
• Enclosure: IP67
Note 2. Electrical Data
• Supply voltage: 42 V dc max.
• Output signal: 4 to 20 mA
Note 3. Installation
•All wiring shall comply with local installation
requirement.
•The cable entry devices shall be of a certified
flameproof type, suitable for the conditions of use.
Note 4. Operation
• Keep strictly the “WARNING” on the label on the
transmitter.
WARNING: AFTER DE-ENERGIZING, DELAY
5 MINUTES BEFORE OPENING.
WHEN THE AMBIENT TEMP. ⭌
70⬚C, USE THE HEATRESIST-
ING CABLES OF HIGHER THAN
90⬚C.
• Take care not to generate mechanical spark when
access to the instrument and peripheral devices in
hazardous location.
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
KEMA Flameproof Certification.
c) CENELEC ATEX Type of Protection “n”
WARNING
When using a power supply not having a non-
incendive circuit, please pay attention not to
ignite in the surrounding flammable atmosphere.
In such a case, we recommend using wiring
metal conduit in order to prevent the ignition.
Caution for CENELEC ATEX Type of Protection “n”
Note 1. Model YTA110/KU2, YTA310/KU2 and
YTA320/KU2 temperature transmitters for
potentially explosive atmospheres:
• Type of Protection and Marking Code: II 3G EEx
nL IIC T5, T4
• Temperature Class: T5, T4
• Ambient Temperature: –40 to 50°C for T5, –40 to
70°C for T4
• Enclosure: IP67
Note 2. Electrical Data
[Supply circuit]
Ui = 30 V
Effective internal capacitance, Ci = 20 nF
Effective internal inductance, Li = 660 µH
[Sensor circuit]
Uo= 8.6 V Io = 30 mA Po = 70 mW
Max. allowed external capacitance, Co = 3 µF
Max. allowed external capacitance, Lo = 20 mH
Note 3. Installation
•All wiring shall comply with local installation
requirements. (refer to the installation diagram)
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