Emerson Rosemount CCO 5500, Справочное руководство

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2. Use the arrow keys to cycle through the four options and press ENTER once the
desired option is selected.
a. Temperature
b. Oxygen
c. Pressure
d. Water Vapor
Once selected, each of the above normalizing parameters have the same suboptions: Set
Standard Levels
and
Set Values
. Under
Set Values
, are three more suboptions that determine
how the instrument reads the data:
Analog Input
,
Serial Input
, and
Keypad Input
.
Set Standard Levels
Each normalizing parameter normalizes the measured gas concentration to standard
conditions of temperature, oxygen, pressure, and water vapor. Set these levels within this
option. Use the arrow keys to change each displayed normalizing standard value.
Temperature
Always use an analog input for temperature correction; this ensures that the flue gas
temperature is being measured continuously and accurately. Connect the analog output
of the temperatue transducer into the Rosemount
™
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 you use the
Keypad Input
, and the gas temperature is higher than 572 ° F (300 °C), the
compensation algorithm becomes less precise, and instrument accuracy deteriorates
accordingly. Rosemount does not recommend this.
Note
If normalization is not required, the instrument must hold the temperature of the gas in the duct
using the
Analog Input
option.
Press ENTER with the
Temperature
option selected to access
Set Standard Levels
and
Set Values
.
Use the arrow keys to toggle between these options and
Exit
.
Set Values
You can bring the normalizing data into the instrument in one of three ways:
• Analog Input
Configuration and startup
44 Rosemount CCO 5500