KROHNE H250 M40 ATEX II2D Ex t-II2G Ex d EN - Manual (Page 7)

DEVICE DESCRIPTION
2
7
H250 M40
www.krohne.com 07/2012 - 4002069601 - MA H250/M40-Ex-II2GD-AD R01
2.6 Protection types
The variable area flowmeter is designed using equipment protection by flameproof enclosures,
protection level "Gb" in accordance with EN 60079-1 and equipment dust ignition protection by
enclosure, protection level "Db" according to EN 60079-31.
The marking is:
II 2G Ex d IIC T6 ... T1 Gb or II 2G Ex d IIB T6 ... T1 Gb or II 2D Ex t IIIC T70
II 2G Ex d IIC T6 ... T1 Gb or II 2G Ex d IIB T6 ... T1 Gb or II 2D Ex t IIIC T70 II 2G Ex d IIC T6 ... T1 Gb or II 2G Ex d IIB T6 ... T1 Gb or II 2D Ex t IIIC T70 II 2G Ex d IIC T6 ... T1 Gb or II 2G Ex d IIB T6 ... T1 Gb or II 2D Ex t IIIC T70 °C Db C Db C Db C Db
The marking contains the following information: The marking contains the following information: The marking contains the following information: The marking contains the following information:
II IIII II Group II explosion protection
2222 Equipment category 2
G G G G Gas explosion protection
D D D D Dust explosion protection
Ex d Ex d Ex d Ex d Electronics compartment - protection type flameproof enclosure
Ex t Ex t Ex t Ex t Protection type equipment - dust ignition protection through housing
IIC IIC IIC IIC Gas group, Suitable for gas groups IIC, IIB and IIA
IIB IIB IIB IIB Gas group, Suitable for gas groups IIB and IIA
IIIC IIIC IIIC IIIC Dust areas, suitable for Group IIIC, IIIB and IIIA
T6 ... T1 T6 ... T1 T6 ... T1 T6 ... T1 Temperature class, suitable for temperature classes T6 ... T1
T70 T70 T70 T70 °C C C C Maximum surface temperature of the converter housing without dust coating at
ambient temperature 65°C / 149°F and product temperature 65°C / 149°F
Gb Gb Gb Gb EPL, suitable for zone 1
Db Db Db Db EPL, suitable for zone 21
AD_H250_M40_II2GD_R01_en_4002069601_PRT.book Page 7 Friday, July 27, 2012 8:17 AM