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Instruction Manual
IM-106-880C, OI
September 2009
1-5
Hazardous Area OCX 8800
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. Refer to
Section 3, Configuration and Startup for specific instructions upon initial
power up.
System Features
1. The O
2
cell output voltage and sensitivity increase as the oxygen
concentration decreases.
2. HART or FOUNDATION fieldbus communication is standard. To use this
capability, you must have either:
a. Model 375 Field Communicator.
b. 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
Hazardous Area OCX 8800 in one of two ways:
a. LOI. The LOI is mounted to the end of the electronics module and
allows local communications with the electronics. Refer to Section 4,
Using the LOI, for more information.
b. HART or FOUNDATION fieldbus interface. The Hazardous Area
OCX 8800's output line transmits a digital signal with the detected
oxygen or combustible levels encoded in a digital format. This
information can be accessed through the following:
• Model 375 Field Communicator - The handheld field
communicator requires Device Description (DD) software specific
to the Hazardous Area OCX 8800. The DD software will be
supplied with many Model 375 units, but can also be
programmed into existing units at most Emerson Process
Management service offices. Refer to Section 6, Field
Communicator, for additional information.
• Personal Computer (PC) - The use of a personal computer
requires AMS software available from Emerson Process
Management.
• Selected Distributed Control Systems - The use of distributed
control systems requires input/output (I/O) hardware and AMS
software which permit HART or FOUNDATION fieldbus
communications.
6. When the transmitter is configured without the LOI an operator must
calibrate and diagnostically troubleshoot the Hazardous Area OCX 8800
using the HART or FOUNDATION fieldbus Interface.
7. Optional Blowback System. The blowback system periodically blows
instrument air back through the sample line filter and out the sample
tube. This clears out particulate and keeps the sample line filter from
clogging.