Emerson IM-106-5500 Manual Do Utilizador

IM-106-5500, Original Issue

August 2005

CCO 5500

4-18

After selecting the parameter to be set up, the ARROW keys will select 
between entering the standard levels and how the normalization data is to be 
brought into the instrument. 

Each normalizing parameter normalizes the 
measured gas concentration to standard 
conditions of temperature, oxygen, pressure 
and water vapor. These levels are set from 
within this option. Use the ARROW keys to change each displayed 
normalizing standard value. 

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. Use 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 4-20 mA inputs. Select the above analog screen and enter 
the values required for the 4 mA and 20 mA inputs. For the oxygen input the 
value must be selected as a wet or dry gas measurement. This is explained in 
more detail below. All the other analyzers in an integrated system must be set 
to the serial inputs and the normalization parameters will be transmitted down 
the serial data highway. 

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 
CCO 5500 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 temperatures 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.