IM 01C50B01-01E
2-6
2. NOTES ON HANDLING
Note 5. Special condition for safe use
• Because the enclosure of the Temperature Transmit-
ter 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
Nonhazardous
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
and Dust Ignition Proof Type
Caution for CENELEC ATEX (KEMA) Flameproof
Type and Dust Ignition Proof Type
Note 1. Model YTA110/KU2, YTA310/KU2 and
YTA320/KU2 temperature transmitters
are applicable for use in hazardous
locations:
• No. KEMA 07ATEX0130
• Applicable Standard: EN 60079-0, IEC 60079-1,
EN 61241-0, EN 61241-1
• Type of Protection and Marking Code: II 2G Ex d
IIC T6/T5, II 2D Ex tD A21 IP67 T70
°
C, T90
°
C
• Ambient Temperature for Gas Atmospheres:
–40 to 75
°
C (T6), –40 to 80
°
C (T5)
• Ambient Temperature for Dust Atmospheres:
–40 to 65
°
C (T70
°
C), –40 to 80
°
C (T90
°
C)
• 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 HEATRESISTING
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:
• Applicable standard: EN60079-15:2005
• Referential standard: IEC60079-0:2004,
IEC60079-11:1999
EN60529:1991
• Type of Protection and Marking Code: II 3G Ex 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
µ
H
[Sensor circuit]
Uo= 8.6 V Io = 30 mA Po = 70 mW
Max. allowed external capacitance, Co = 3
µ
F
Max. allowed external inductance, Lo = 20 mH
Note 3. Installation
• All wiring shall comply with local installation
requirements. (refer to the installation diagram)
