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Appendix E Hazardous area ratings and considerations
102 |
266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB
E.2.2
Type of protection: "Non-Incendive" Certification (Code EC)
Code EC ratings:
The 266 transmitters have FM certification for the following hazardous location protections:
— Non-Incendive (US and Canada): Class I, Division 2, Groups ABCD, T* in accordance with Non-Incendive field wiring
requirements for hazardous (classified) locations per Control Drawing DH3173
— Non Sparking (US and Canada): Class I, Zone 2, (A)Ex nA IIC T* in accordance with Non-Incendive field wiring requirements
for hazardous (classified) locations per Control Drawing DH3173
— T*: Temperature class is dependent on the maximum input current and the maximum ambient temperature per Table 22
Table 22: Temperature class definitions
T Class
Minimum ambient
°C
Maximum ambient
°C
Imax
mA
Power
W
T4
-50 °C
+85 °C
100
0.75
T4
-50 °C
+70 °C
160
1
T5
-50 °C
+40 °C
100
1.75
T6
-50 °C
+40 °C
50
0.4
— Type 4X applications Indoors/Outdoors
— "Dual Seal" per ANSI/ISA 12.27.01 as indicated
WARNING
–
When installed, power must be supplied to this transmitter by a voltage limiting device which will
prevent the rated voltage of 30 Vdc being exceeded.
The temperature sensor circuit (Pt100) must be connected in accordance with the requirements of the FM
certificate.
For correct field installation of the 266 pressure transmitters, please see the related control drawing.
E.2.3
Type of protection: “Explosion-proof” combined with “Non-Incendive” Certification (Code ET) )))
Code ET ratings:
This code provides a nameplate that has all the ratings of the Explosion-proof (Code EB) described in section
E.2.1 and all the ratings of the Non-Incendive (Code EC) described in section E.2.2. The ratings are listed on the nameplate with
one mark showing the instrument can be installed as either Explosion-proof or as Non-Incendive.
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