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6 Electrical connection
6.1 Power supply voltage
- The transmitter type TR must be supplied with 24 V DC, 2-wire technique.
- Terminal voltage 14 to 30 V DC (terminals 1 and 2)
- Recommendation: 2-wire cables, twisted and shielded
(cable diameter 6-12 mm)
- Ground cable shield according to section 16.1 Wiring diagram.
- In order to ensure safe HART
minimum load with R
- For the maximum amount of line and load resistance, see diagram below.
The maximum load depends on the supply voltage.
1000
800
600
400
200
0
14
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communication, the limits for the
≥ 250 Ω must be observed.
L
Maximum load
16
18
20
<
For
U
15
2 .
V
:
B
≥
For
U
15
2 .
V
:
B
22
24
Supply voltage [V]
−
(
U
14
V
)
=
R
B
. 0
004
A
−
(
U
8
5 .
V
)
=
R
B
. 0
022
A
26
28
30
12
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