Types Of Protection - KROHNE DK37/M8 Series Supplementary Instructions Manual

DK37/M8

2.6 Types of protection

The variable area flowmeter is designed with protection type intrinsic safety "i" according to
ABNT NBR IEC 60079-11.
The identification for equipment protection level (EPL) Gb is:
Ex ia IIC T6...T3 Gb Ex ia IIC T6...T3 Gb
Ex ia IIC T6...T3 Gb Ex ia IIC T6...T3 Gb
The marking contains the following information:
Ex ia Ex ia
Ex ia Ex ia
IIC IIC IIC IIC
T6...T3 T6...T3 T6...T3 T6...T3
Gb Gb
Gb Gb
Table 2-1: Description of the marking
INFORMATION!
For the equipment protection level (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 additional identification of the version for the equipment protection level (EPL) Db is:
Ex ia IIIC T75 Ex ia IIIC T75°C...T200
Ex ia IIIC T75 Ex ia IIIC T75
The marking contains the following information:
Ex ia Ex ia Ex ia Ex ia
IIIC IIIC IIIC IIIC
T75 T75°C...T200 C...T200°C C C C
T75 T75 C...T200 C...T200
Db Db Db Db
Table 2-2: Description of the marking
INFORMATION!
For the equipment protection level (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.
03/2019 - 4007510401 - AD DK37/M8 Exi INMETRO R01 en
Explosion protection through intrinsic safety, protection level "ia"
Gas group, suitable for gas groups IIC, IIB and IIA
Temperature class range, suitable for temperature classes T6...T1
EPL, suitable for zone 1 and zone 2
C...T200°C Db C Db
C...T200 C...T200 C Db C Db
Explosion protection through intrinsic safety, protection level "ia"
Dust group, suitable for groups IIIC, IIIB and IIIA
Maximum surface temperature at +65°C / +149°F ambient temperature
EPL, suitable for zone 21 and zone 22
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DEVICE DESCRIPTION
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