DEVICE DESCRIPTION
2
7
DK46 - DK800
www.krohne.com05/2019 - 4000430905 - AD DK46-800 Exi-II2G R06 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 2G Ex ia IIC T6...T1 Gb
II 2G Ex ia IIC T6...T1 GbII 2G Ex ia IIC T6...T1 Gb
II 2G Ex ia IIC T6...T1 Gb
The marking contains the following information:
2.7 Ambient temperature / temperature classes
Due to the influence of the product temperature, variable area flowmeters with built-in electrical
equipment (electric variants) are not assigned to any fixed temperature class.
The temperature class of these devices is rather a function of the product temperature and
ambient temperature that is present and the specific device version.
The classification is outlined in the following tables.
The tables take into account the following parameters:
• Built-in equipment
• Maximum values I
i
and P
i
for K1, K2
• Ambient temperature T
amb
• Product temperature T
m
When using more than one built-in equipment, the data of the most unfavourable equipment
should be used.
II
IIII
II Explosion protection, group II
2
22
2 Equipment category 2
G
GG
G Gas explosion protection
Ex ia
Ex iaEx ia
Ex ia Explosion protection through intrinsic safety, protection level "ia"
IIC
IICIIC
IIC Gas group, suitable for gas groups IIC, IIB and IIA
T6...T1
T6...T1T6...T1
T6...T1 Temperature class range, suitable for temperature classes T6...T1
Gb
GbGb
Gb EPL, suitable for zone 1
Table 2-1: Description of the marking
INFORMATION!
For the equipment category II 2 G or EPL Gb, connection to separate intrinsically safe circuits
with protection level "ib" is required.
When connecting the variable area flowmeter to separate intrinsically safe circuits with
protection level "ia", a higher protection level is given.
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