Emerson IM-106-5500 Manual Do Utilizador

IM-106-5500, Original Issue
August 2005

3-11

CCO 5500

The transmissivity of a sample of any 
gas depends both on the 
concentration and on the path length 
through which the radiation is 
transmitted. Similarly, the output of the CCO 5500 monitor also 
depends on the path length of the flue gas through which the 
radiation is transmitted. 

Refer to “Points to Consider” on page 2-4.

The Rosemount Analytical analyzers are sensitive to the product of 
concentration x path length, and in order to obtain a true value of 
concentration of gas, it is necessary to input the correct path length 
into the processor. This value is then used to produce a final value of 
gas concentration. 

NOTE
The path length entered must represent the length of the actual gas pass, not 
the flange-to-flange dimension between the transmitter and receiver.

d. Alarm 

A contact output is available to warn of 
a high gas concentration. This contact 
output may be triggered from any of 
the four averaging stacks. Select its 
source with the ARROW key and enter it with the ENTER key. 

Select the units for the alarm - these 
may be different to the units selected 
for the analog output. 

After the source has been selected, 
the instrument requires a level at 
which the output will be triggered. Set 
the desired level with the ARROW 
keys. 

e. Cal Factor 

NOTE
Do not enter this mode without recording the original cal factor as displayed in 
mode 4. The Cal factor will be lost when this menu option is entered. 

During the calibration routine, the 
instrument calculates a 'Cal Factor' 
which sets the basic calibration of the 
instrument. This value may be 
changed from this mode.