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Instruction Manual
IM-106-880, Rev 1.0
January 2007
OCX 8800
4-2
Figure 4-1. Signal Line Connections,
≥ 250 Ohms Load Resistance
Method 1, for Load Resistance
≥ 250 Ohms
Refer to Figure 4-1 and the following steps to connect the HART
communicator to a signal line 250 ohms or more of load resistance.
Using the supplied lead set, connect the HART communicator in parallel to
the OCX 8800. Use any wiring termination points in the oxygen analog output
4-20 mA signal line.
Loop
Connectors
O 4-20 mA Signal Line
2
HART
Communicator
Model 275/375
RL 250Ω
Analog Output Device
HART Communicator
Rear Panel
Lead Set
37390023
4-20 mA Terminal Block in
Electronics Housing
≥
A OUT 1 -
A OUT 1 +
1
Do not make connections to the HART communicator's serial port, 4-20 mA signal lines, or
NiCad recharger jack in an explosive atmosphere. Explosions can result in death or serious
injury.