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8 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 IECEx FME 16.0002X

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 Æ50 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 Æ50 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.

Tank Silo

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

ABB 266CSH User Manual

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