Figure 7-1. Signal Line Connections, ≥ 250 Ohms Load Resistance - Emerson Rosemount Analytical Oxymitter 4000 Instruction Manual

Instruction Manual
IB-106-340C Rev. 4.1
July 2004
a. Method 1, For Load Resistance ≥ 250
Ohms
Refer to Figure 7-1 and the following steps
to connect the HART Communicator to a
signal line 250 ohms or more of load
resistance.
Explosions can result in death or seri-
ous injury. Do not make connections
to the HART Communicator's serial
port, 4-20 mV signal line, or NiCad re-
charger jack in an explosive
atmosphere.
Using the supplied lead set, connect the
HART Communicator in parallel with to the
Hazardous Area Oxymitter 4000. Use any
wiring termination points in the analog out-
put 4-20 mA signal line.
AC
AC
+
-
+
4-20
-
TERMINAL BLOCK
LOOP CONNECTORS
SERIAL PORT & BATTERY
CHARGER MUST
NOT BE USED IN
HAZARDOUS AREAS
HART COMMUNICATOR
Figure 7-1. Signal Line Connections, ≥ 250 Ohms Load Resistance
7-2 HART/AMS
L1
N
USE INTERFACE
LOOP CONNECTORS
00275 0013 ONLY
SERIAL PORT
REAR PANEL
Hazardous Area Oxymitter 4000
b. Method 2, For Load Resistance < 250
Ohms
Refer to Figure 7-2 and the following steps
to connect the HART Communicator to a
signal line with less than 250 ohms load
resistance.
Explosions can result in death or seri-
ous injury. Do not make connections
to the HART Communicator's serial
port, 4-20 mA signal line, or NiCad re-
charger jack in an explosive
atmosphere.
1. At a convenient point, break the analog
2. Plug the load resistor into the loop
4-20 mA SIGNAL LINE
HART
COMMUNICATOR
Rosemount Analytical Inc. A Division of Emerson Process Management
output 4-20 mA signal line and install
the optional 250 ohm load resistor.
connectors (located on the rear panel
of the HART Communicator).
≥ Ω
RL 250
ANALOG OUTPUT DEVICE
LEAD SET
23230001