Ex "Ib" / Ex "N" Design For Vt41/St41 And Vr41/Sr41 (4 ... 20 Ma / Hart) - ABB FV4000 Operating Instruction

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11.2 Ex "ib" / Ex "n" design for VT41/ST41 and
VR41/SR41 (4 ... 20 mA / HART)
Important
The devices may only be operated in explosive areas if the
housing covers have been fully closed.
EC type-examination certificate TÜV 08 ATEX 554808 X
Designation:
II 2G Ex ib IIC T4
II 2D Ex tD A21 T85°C...T medium IP67
Declaration of conformity TÜV 08 ATEX 554833 X
Designation:
II 3G Ex nA [nL] IIC T4
II 3D Ex tD A22 T85°C...T medium IP67
Certificate of conformity IECEx TUN 07.0014 X
Designation:
Ex ib IIC T4...T1
Ex nA [nL] IIC T4...T1
Ex tD A21 IP6X TX°C
Ex ib
Ex nA [nL]
87 86 86 85 84 83 82
PA
Ex ib
Ex nA [nL]
31 32 41 42
PA
Fig. 50: Electrical connection for VT41 / ST41 and VR41 / SR41
1 Flowmeter sensor
2 Transmitter
Flowmeter sensor wire colors
Terminal
81
82
83
84
85
86
86
87
D184B097U02
VR41 / SR41
1
81
2 3
Ex ib
Ex nA [nL]
31 32 41 42
PA
VT41 / ST41
G00668
3 Flowmeter
Wire color
Red
Blue
Pink
Gray
Yellow
Green
Brown
White
1) Supply power terminals 31 / 32
a) Ex ib:
b) Ex nA [nL]
2) Switching output, terminals 41/ 42
The switching output (passive) optocoupler is designed as a
NAMUR contact (to DIN 19234).
When the contact is closed, the internal resistance is approx.
1,000 Ω . When the contact is open, it is > 10 K Ω . The switching
output can be changed over to "optocoupler" if required.
a) NAMUR with switching amplifier
b) Switching output (optocoupler)
- Ex ib:
- Ex nA [nL]:
Important
The installation instructions in accordance with EN 60079-14
must be complied with.
When commissioning the flowmeter, refer to EN 50281-1-2
regarding use in areas with combustible dust. After switching
off the supply power, wait t > 2 minutes before opening the
transmitter housing.
11.2.1 Supply power or supply current
1,8
1,6
1,4
1,2
1
0,8
0,6
0,4
0,2
0
10
Fig. 51
The minimum voltage U S of 14 V is based on a load of 0 Ω .
U S = supply voltage
R B = Maximum permissible load in power supply circuit, e.g.,
indicator, recorder or power resistor
FV4000 / FS4000
Ex relevant specifications
U i = 28 V DC
U B = 14 ... 46 V DC
U i = 15 V
U B = 16 ... 30 V
I B = 2 ... 15 mA
14 20 28 30
Ex ib
Ex nA [nL]
40 48 50
U S [V]
G00670
99