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266CRH / 266CRT, 266CSH / 266CST MULTIVARIABLE PRESSURE TRANSMITTER | OI/266CXX/MODBUS-EN REV. A
... 2 Use in potentially explosive atmospheres
... Ex explosion protection aspects (Europe and International)
Code E9 Ex-Marking IECEx
Ex db IIC T6 Ga/Gb
and
Ex tb IIIC T85 °C Db
FM Approvals Certificate
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 to 75 °C.
•
Ex tb: Dust protected Flame-proof enclosure
•
IIIC : Explosion Group 'dust'
•
T85 °C: Maximum surface temperature of the transmitter
housing at an ambient temperature Ta from 50 to 75 °C
for dust (not for gas) with a dust layer up to 50 mm thick
•
IP 67: 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.
IECEx FME 16.0002X
Tank
A 266 transmitter, category 1/2 G, Ex d
B 266 transmitter, category 1/2 D
1 Tank or silo for gas or dust
2 Dangerous medium (process)
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 enclosure, can only be used on zone 1 (gas) / zone 21 (dust).
Figure 1: Examples of gas and dust application zone separations
Silo
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