Emerson Rosemount CCO 5500, Reference Manual

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This uses the 4-20 mA inputs within the processor to receive the measured
transducer data. The values at 4 mA and 20 mA will be requested should this option
be selected.
• Serial Input
If you use an input unit, all normalizing data can be transmitted via the serial data
line.
• You can enter a fixed value via the keypad. This is suitable where the value is stable
to about ±5%.
With an integrated system, set the lead analyzer's normalizing parameters to the 4-20 mA
inputs. Then set all the other analyzers to serial, and the normalization parameters are
transmitted down the serial data highway.
Oxygen
To correct the data to standard levels of oxygen, you must enter an estimate of the oxygen
at the point of measurement. If the oxygen level is being continuously measured, connect
the analog output of the oxygen analyzer into the Rosemount
™
CCO 5500 Analyzer and
select Analog Input . You must define this input as either WET or DRY depending on how the
measurement is made. After you define the wet or dry, you need to define the Analog Input
values; set the 4 mA and 20 mA values. If the oxgyen level is relatively constant through all
firing conditions, you may use a fixed keypad input.
With an integrated system, you can take the oxygen data to the instrument via the serial
data line.
Note
If normalization is not required, you must set the normalizing parameters for oxygen in the
instrument.
Pressure
To correct the data to a standard pressure, normally 14.7 psi (101 kPa), you must
determine the pressure at the point of measurement. If the flue pressure is relatively
constant through all firing conditions, then you may use a fixed keypad input. If the
pressure, is not constant, measure it and bring it into the instrument via the 4-20 mA
analog input within the processor.
Configuration and startup
Reference Manual 45