Astar HT-3300 Especificaciones Pagina 66

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56
Reference Manual
00809-0100-4811, Rev DA
Section 3: Installation
January 2015
Installation
Non-intrinsically safe output
For non-intrinsically safe installations, wire the transmitter as shown in Figure 3-19.
Note
Make sure the power supply is off when connecting the transmitter.
Figure 3-19. Wiring Diagram for Non-Intrinsically Safe Installations
Note
Rosemount 3300 Series Transmitters with Flameproof/Explosion-proof HART Output have a
built-in barrier; no external barrier needed.
For HART communication, a minimum load resistance of 250 within the loop is required. For
maximum load resistance, see Figure 3-16 (Explosion-proof/Flameproof) and Figure 3-17 on
page 54 (Non-hazardous installations).
The power supply voltage ranges from V
min
Vdc to 42 Vdc, where V
min
is the minimum voltage
given by:
For Explosion-proof/Flameproof applications, the resistance between the negative terminal on
the transmitter and the power supply must not exceed 300 .
Note
EEx d version: If there is a risk for a difference in voltage potential between transmitter ground
and power supply ground, a galvanic isolator is required.
11 V Non-hazardous locations certification
16 V Explosion-proof/flameproof certification
Load resistance 250
Power supply
HART
modem
Field Communicator
PC
Rosemount 3300 Series
Transm itter
Maximum voltage: U
m
= 250 V
HART: U
n
= 42.4 V
V
min
to 42 Vdc
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