DEVICE DESCRIPTION
2
9
OPTISWIRL 4200
www.krohne.com
08/2016 - 4005002601- AD OPTISWIRL4200 Ex-II2GD R01
2.7 Ambient temperature / temperature classes
Because of the influence of the temperature of the product, no fixed temperature class is
assigned to vortex flowmeters. 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:
•
Ambient temperature T
amb
•
Product temperature T
m
•
Nominal size DN
•
Heat resistance of the connecting cable
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
D
D
D
D
Dust ignition protection
Ex db
Ex db
Ex db
Ex db
Protection type "Flameproof enclosure"
Ex eb
Ex eb
Ex eb
Ex eb
Protection type "Increased safety"
Ex tb
Ex tb
Ex tb
Ex tb
Protection type "Equipment - dust ignition protection through enclosure"
Ex ia
Ex ia
Ex ia
Ex ia
Protection type "Intrinsic safety", protection level "ia" (flow sensor circuit, compact device)
Ex [ia]
Ex [ia]
Ex [ia]
Ex [ia]
Protection type "Intrinsic safety", protection level "ia" (flow sensor circuit, remote version)
IIC
IIC
IIC
IIC
Gas group, suitable for gas groups IIC, IIB and IIA
IIIC
IIIC
IIIC
IIIC
Dust areas, suitable for groups IIIC, IIIB and IIIA
T6...T2
T6...T2
T6...T2
T6...T2
Temperature class range
T70
T70
T70
T70
°
C
C
C
C
Maximum surface temperature of the signal converter housing without dust coating at
ambient temperature 65
°
C / 149
°
F and product temperature 65
°
C / 149
°
F
T70
T70
T70
T70
°
C...
C...
C...
C...
T240
T240
T240
T240
°
C
C
C
C
Maximum surface temperature of the flow sensor housing without dust coating at ambient
temperature 65
°
C / 149
°
F (is determined by the product temperature)
Gb
Gb
Gb
Gb
EPL, suitable for zone 1
Db
Db
Db
Db
EPL, suitable for zone 21
INFORMATION!
In principle, operation is possible in all ranges of the temperature classes T1...T6.