KROHNE DK37 Series, Supplementary Instructions Manual

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2
DEVICE DESCRIPTION
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DK37/M8 - H250/M8
www.krohne.com 05/2018 - 4005351602 - AD DK37/H250/M8 II2GD R02 en
2.6 Types of protection
The variable area flowmeter is designed with protection type intrinsic safety "i" according to
EN 60079-11.
The identification for equipment category II 2 G or EPL Gb is:
II 2 G Ex ia IIC T6...T3 Gb
II 2 G Ex ia IIC T6...T3 Gb II 2 G Ex ia IIC T6...T3 Gb
II 2 G Ex ia IIC T6...T3 Gb
The additional identification of the version for the equipment category II 2 D and EPL Db is:
II 2 D Ex ia IIIC T75
II 2 D Ex ia IIIC T75 II 2 D Ex ia IIIC T75 II 2 D Ex ia IIIC T75
°
C ... T200 C ... T200 C ... T200 C ... T200
°
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 Explosion protection, group II
2222 Equipment category 2
G
G G
G Gas explosion protection
Ex ia Ex ia Ex ia Ex ia Explosion protection through intrinsic safety, protection level "ia"
IIC
IIC IIC
IIC Gas group, suitable for gas groups IIC, IIB and IIA
T6...T3 T6...T3 T6...T3 T6...T3 Temperature class range, suitable for temperature classes T6...T1
Gb
Gb Gb
Gb EPL, suitable for zone 1 and zone 2
INFORMATION!
For the equipment category II 2 G and EPL Gb, connection to an intrinsically safe circuit with
protection level "ib" is required.
When connecting the variable area flowmeter to an intrinsically safe circuit with protection level
"ia", a higher protection level is given.
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 Explosion protection, group II
2222 Equipment category 2
D D D D Dust ignition protection
Ex ia
Ex ia Ex ia
Ex ia Explosion protection through intrinsic safety, protection level "ia"
IIIC IIIC IIIC IIIC Dust group, suitable for groups IIIC, IIIB and IIIA
T75
T75 T75
T75 ° C ... T200
C ... T200 C ... T200
C ... T200 ° C
C C
C Maximum surface temperature at +65 ° C / +149 ° F ambient temperature
Db Db Db Db EPL, suitable for zone 21 and zone 22
INFORMATION!
For the equipment category II 2 D and EPL Db, connection to an intrinsically safe circuit with
protection level "ib" is required.
When connecting the variable area flowmeter to an intrinsically safe circuit with protection level
"ia", a higher protection level is given.