Astar HT-3300 Especificaciones Pagina 68

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58
Reference Manual
00809-0100-4811, Rev DA
Section 3: Installation
January 2015
Installation
3.7 Optional devices
3.7.1 Tri-Loop
The Rosemount 3300 Series Transmitter outputs a HART signal with four process variables. By
using the Model 333 HART Tri-Loop up to three additional analog 4-20 mA outputs are
provided.
Figure 3-21. Wiring Diagram for HART Tri-Loop
Configure Channels 1, 2, and 3 to reflect the units as well as Upper Range Values and Lower
Range Values for your secondary, tertiary, and fourth variables (variable assignment is
configured in the Rosemount 3300 Series). It is also possible to enable or disable a channel from
this menu. See “Special functions” on page 87 for further information on how to install a
Tri-Loop.
Ch. 3
Ch. 2
Ch. 1
Each Tri-Loop
channel receives
power from
control room
Channel 1 must be
powered for the
Tri-Loop to
operate
Device receives
power from
control room
R
L
250
HART burst command 3/
analog output
Intrinsically safe barrier
DIN rail mounted
HART Tri-Loop
Control room
Burst input
to Tri-Loop
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