1. Individual 4-20 mA isolated outputs that are proportional to the measured
oxygen and combustibles concentrations. The oxygen output also contains
HART
®
communication.
2. Single FOUNDATION
™
Fieldbus output.
The electronics control both sensor temperatures and provide individual 4-20 mA
isolated outputs that are proportional to the measured oxygen and combustibles
concentrations. The power supply can accept voltages of 100 to 240 Vac and 50 to
60 Hz. The electronics accepts millivolt signals generated by the sensors and
produces the outputs to be used by remotely connected devices. The outputs are
isolated 4-20 mA linearized currents. Refer to Configuration and start-up for
specific instructions upon initial power up.
1.2.4 System features
1. The O
2
cell output voltage and sensitivity increase as the oxygen
concentration decreases.
2. HART
®
communication is standard. To use this capability, you must have
either:
a. Field Communicator
b. Asset Management Solutions (AMS) software for the PC
3. Oxygen cell and heater/thermocouple assembly are field replaceable.
4. Electronics are automatically configured for line voltages from 100 to 240
Vac.
5. An operator can calibrate and diagnostically troubleshoot the transmitter in
one of two ways:
a. Local operator interface (LOI): The LOI is mounted to the end of the
electronics module and allows local communications with the
electronics. Refer to Using the local operator interface (LOI) for more
information.
b. Optional HART interface. Each of the transmitter's 4-20 mA output
lines transmits an analog signal proportional to oxygen or
combustible levels detected. The HART output is superimposed on the
oxygen 4-20 mA output line only. This information can be accessed
through the following:
• Field Communicator: The handheld Field Communicator requires
Device Description (DD) software specific to the Rosemount
OCX8800. The DD software is supplied with many Field
Communicators, but can also be programmed into existing Field
Communicators at most Emerson service offices. Refer to Using
HART
®
communications for additional information.
• Personal computer (PC): The use of a personal computer requires
AMS software available from Emerson.
Manual Description and specifications
00809-0500-4880 December 2022
Rosemount OCX8800A 13
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