Emerson OCX 8800 instruction manual Signal Line Connections ≥ 250 Ohms Load Resistance

OCX 8800

Figure 5-1. Signal Line Connections,

≥250 Ohms Load Resistance

4-20 mA Terminal Block in

Electronics Housing

1

O2 4-20 mA Signal Line

A OUT 1 +

A OUT 1 -

Loop

Connectors

HART

Communicator

Model 275/375

HART Communicator

Rear Panel

Instruction Manual

IM-106-880, Rev 1.0

January 2007

RL ≥ 250Ω

Analog Output Device

Lead Set 37390023

Method 1, for Load Resistance ≥ 250 Ohms

Refer to Figure 5-1 and the following steps to connect the HART communicator to a signal line 250 ohms or more of load resistance.

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.

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.

5-2