7 Connection
7.4 Inputs
FLUXUS G831ST-HT
2021-06-01, UMFLUXUS_G831ST-HTV1-0EN
62
7.4
Inputs
7.4.1
Current input
For the connection of the input cable to the transmitter see section 7.2.1, Fig. 7.12 and Tab. 7.8.
Fig. 7.12: Connection of the inputs to the transmitter
Important!
Observe the correct polarity in order to avoid damaging the current source. A permanent short circuit can lead to the
destruction of the current input.
Tab. 7.8:
Connection of a passive current sink
input
transmitter
external circuit
explanation
internal circuit
connection
current input Ix, active,
intrinsically safe
U
o
= 29.2 V
I
o
= 88 mA
P
o
= 0.64 W
L
o
= 4.1 mH
C
o
= 73 nF
R
int
= 360 Ω
I
max
≤ 40 mA
I = 0...20 mA (measuring range)
U
min
= 19.6 V - (R
int
· I)
U
min
= 12.4 V
The current input is not
galvanically isolated from the
flowmeter.
AR
AV
ARS AVS
BR
BV
BRSBVS
L
(+)
N
(-)
12
11
10
9
8
7
6
5
4
3
2
1
upper housing,
back view
lower housing,
front view
6
5
4
3
2
1
V
R
int
-
+
x+
x-
