Filter
Top Products
Instruction Manual
IM-106-5500, Original Issue
August 2005
CCO 5500
3-14
b. Set Values
The normalizing data can be brought into the instrument in one of 3
ways:
1
By entering a fixed value via the
keypad. This is suitable where the
value is stable to about ±5%.
2
If an INPUT UNIT is being used, all
normalizing data can be
transmitted via the serial data line.
3
Using the 4-20 mA inputs within the
processor to receive a
measurement transducer data. The
values at 4 mA and at 20 mA will
be requested should this option be selected.
With an integrated system the lead analyzer should have its
normalizing parameters set to the 4-20 mA inputs. All the other
analyzers must then be set to serial and the normalization
parameters will be transmitted down the serial data highway.
c. Temperature
An analog input should always be used for temperature correction -
this ensures that the flue gas temperature is being measured
continuously and accurately. Connect the analog output of the
temperature transducer into the Rosemount Analytical analyzer, and
select the analog input option. This value is used to normalize the
gas concentration measurement, and to correct for the effects of
temperature on the IR absorption spectrum.
If a fixed value input is used, then at flue gas temperature higher than
572
o
F (300
o
C) the compensation algorithm will become less precise
and instrument accuracy will deteriorate accordingly. This is not
recommended.
NOTE
If normalization is not required, the instrument must hold the temperature of
the gas in the duct - analog input.
d. Oxygen
To correct the data to standard levels of oxygen, an estimate of the
oxygen at the point of measurement is required. If the oxygen level is
being continuously measured, connect the analog output of the
oxygen analyzer into the CCO 5500 analyzer, and select the analog
input in the normalization menu. This input must be defined as either
WET or DRY, depending on how the measurement is made. After the
wet or dry has been defined the analog input values need defining,
set the 4 mA and 20 mA values. If the oxygen level is relatively
constant through all firing conditions, then a fixed (keypad) input may
be used.
5 TEMP DegF
Keypad Input
5 TEMP DegF
Serial Input
5 TEMP DegF
Analog Input