IM 01C50B01-01E
2-8
2. NOTES ON HANDLING
2.7.3 CENELEC (KEMA) Certification
Model YTA110/KU1, YTA310/KU1 and YTA320/
KU1 temperature transmitters 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.
a) CENELEC (KEMA) Intrinsically Safe Type
Caution for CENELEC (KEMA) Intrinsically safe type
Note 1. Model YTA110/KU1, YTA310/KU1 and
YTA320/KU1 temperature transmitters for
potentially explosive atmospheres:
• Type of Protection and Marking code: EEx ia IIC
• Temperature Class: T4, T5
• Ambient Temperature: –40 to 70°C for T4, –40 to
50°C for T5
Note 2. Electrical Data
• In type of explosion protection intrinsic safety EEx
ia IIC only for connection to a certified intrinsically
safe circuit with following maximum values:
• [Supply circuit]
Ui = 30 V Ii = 165 mA
Pi = 0.9 W
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 = 3 µF
Max. allowed external inductance = 20 mH
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 Intrinsically safe Certification.
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 (KEMA) Flameproof Type
Caution for CENELEC (KEMA) Flameproof Type
Note 1. Model YTA110/KU1, YTA310/KU1 and
YTA320/KU1 temperature transmitters for
potentially explosive atmospheres:
• Type of Protection and Marking Code: EEx d IIC T6
Temperature Class: T6
• Ambient Temperature: –40 to 75°C
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: WAIT 5 MIN. AFTER POWER-
DISCONNECTION, BEFORE
OPENING THE ENCLOSURE.
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.
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