Optional Devices; Tri-Loop - Emerson Rosemount 3300 Series Reference Manual

Reference Manual
00809-0100-4811, Rev AB
July 2003

OPTIONAL DEVICES

Tri-Loop

Figure 3-15. Wiring diagram for
HART Tri-Loop
The Model 3300 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.
DIN Rail Mounted
HART Tri-Loop
Ch. 3
Ch. 2
Ch. 1
Intrinsically Safe Barrier
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 Model 3300). It is also
possible to enable or disable a channel from this menu. See "Special
Functions" on page 4-24 for further information on how to install a Tri-Loop.
Rosemount 3300 Series
Burst Input
to Tri-Loop
≥
250 Ω
R
L
HART Burst Command 3/
Analog Output
Each Tri-Loop
Channel
recieves power
from Control
Room
Channel 1 must
be powered for
the Tri-Loop to
operate
Device recieves
power from
Control Room
Control Room
3-21