Appendix E Hazardous area ratings and considerations
266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB | 99
Code E9 Rating: IECEx Ex d IIC T6 and IECEx Ex tD A21 IP67 T85 °C, Ta = -50 °C to +75 °C
FM Approvals Certificate: IECEx FME 09.0002X, The meaning of the IECEx rating code is as follows:
— Ex d: Flame-proof enclosure
— IIC: Explosion group gases
— T6: Temperature class of the transmitter (corresponds to 85 °C maximum) with an ambient temperature from -50 °C to 75 °C.
— Ex tD: Dust protected Flame-proof enclosure
— A21: Dust Intended Zone of Installation
— T85 °C: Maximum surface temperature of the transmitter housing at an ambient temperature Ta from -50 °C to +75 °C for dust
(not for gas) with a dust layer up to 50 mm thick
— IP67: For protection type, the first characteristic numeral indicates the protection of the integrated electronics against ingress of
solid foreign objects including dusts. The assigned “6” means a dust-tight enclosure (no ingress of dust). The second
characteristic numeral indicates the protection of the integrated electronics against ingress of water. The assigned “7” means a
water-protected enclosure against a temporary immersion in water under standardized conditions of pressure and time.
1
2
3B
Zone 20 Zone 21
1
2
3A
Zone 0 Zone 1
Figure legend:
1) Container
2) Dangerous medium (process)
3A) 266 transmitter, category 1/2 G, Ex d
3B) 266 transmitter, category 1/2 D, Ex tD
Figure note: Only the "process measuring part" of this transmitter can be connected to Zone 0 (gas)-zone 20 (dust); the remaining parts of the
transmitter, for example, it's housing, can only be used on Zone 1 (gas)-zone 21 (dust).
Figure 58: Examples of gas and dust application zone separations
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