KROHNE H250 M9S ATEX II3D Ex t-II3G Ex nA EN - Manual (Page 7)

DEVICE DESCRIPTION
2
7
H250 M9
www.krohne.com 10/2012 - 4000646002 MA H250/M9-Ex-II3GD-AD-R06-en
2.6 Types of protection
2.6.1 Type of protection for gas hazard areas
The variable area flowmeter is designed with protection type "non-sparking" 'nA' in accordance
with EN 60079-15. Protection against explosion is ensured in that no sparking contacts or hot
surfaces lead to ignition under normal operating conditions.
The marking is:
II 3G Ex nA IIC T6 Gc
II 3G Ex nA IIC T6 Gc II 3G Ex nA IIC T6 Gc II 3G Ex nA IIC T6 Gc
2.6.2 Type of protection for dust hazard areas
The variable area flowmeter is designed with protection type "protection by enclosure in
accordance with EN 60079-31. Dust protection is guaranteed by the use of a housing which
provides appropriate protection against penetration by dust.
The marking is:
II 3D Ex t IIIC T65
II 3D Ex t IIIC T65 II 3D Ex t IIIC T65 II 3D Ex t IIIC T65°C Dc C Dc C Dc C Dc
IP65 IP65 IP65 IP65
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
3333 Equipment category 3
G G G G Gas explosion protection
Ex nA Ex nA Ex nA Ex nA Protection type non-sparking
IIC IIC IIC IIC Gas group, suitable for gas groups IIA, IIB, IIC
T6 T6 T6 T6 Temperature class, suitable for T6 ... T1
Gc Gc Gc Gc EPL, suitable for zone 2
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
3333 Equipment category 3
D D D D Dust explosion protection
Ex t Ex t Ex t Ex t Protection type equipment 'dust ignition protection through housing'
IIIC IIIC IIIC IIIC Dust group, suitable for dust groups IIIA, IIIB and IIIC
T65 T65 T65 T65°C C C C Maximum surface temperature without dust coating at ambient temperature 60°C / 140°F
and product temperature 60°C / 140°F
Dc Dc Dc Dc EPL, suitable for zone 22
IP65 IP65 IP65 IP65 Foreign bodies and water pollution control
AD_H250_M9_II3GD_R06_en_646002_PRT.book Page 7 Wednesday, October 17, 2012 8:03 AM