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5. HART communication
Danger of death from explosion
The intrinsically safe circuit for connecting a
-
HART communications interface (HART
DANGER
communicator or HART modem) may be
broken only if there is no risk of an explosion.
An additional signal complying with the HART
logue output signal. Configuration of the device can be carried out with the aid of a
®
HART
communication device. We would recommend our CIS 150 programming kit
(available as an accessory) for this purpose.
In order to ensure trouble-free operation, the following specifications should be taken into
account:
Maximum length of cable between measuring instrument and supply unit:
⋅
⋅
6
65
10
40
10
=
−
L
⋅
max
R
C
C
V
V
V
where L
: maximum length of the cable in [m]
max
R
: resistance of the cable together with
V
the load resistance in [Ω]
C
: capacitance of the cable in [pF/m]
V
Resistance R:
−
U
12
=
Ω
R
, 0
024
where U:
supply in [V
The resistance must be at least 250 Ω.
3
]
DC
®
specification is superposed on the ana-
EN
43
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