Emerson IM-106-5500 Manual Do Utilizador

IM-106-5500, Original Issue
August 2005

4-19

CCO 5500

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 measurement has been defined as wet or 
dry, 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. 

NOTE
If normalization is not required, the instrument must have the normalizing 
parameters for oxygen set to 0% (standard level and keypad input). 

With an integrated system the oxygen data can be taken to the CCO 5500 via 
the serial data line. 

To correct the data to a standard pressure - normally 14.65 psi (101 kPa), the 
pressure at the point of measurement needs to be determined. If the flue 
pressure is relatively constant through all firing conditions, then a fixed input 
may be used. If the pressure is not constant, it should be measured and 
brought into the CCO 5500 via the 4-20 mA input within the processor. 

NOTE
If normalization is not required, the CCO 5500 must have the normalizing 
parameters for pressure set to 101 kPa (standard level and keypad input). 

With an integrated system the pressure data can be taken to the CCO 5500 
via the serial data line. 

An 'across the duct' monitor measures the gas concentration under wet 
conditions, that is, unlike a sampling system, the gas has not been 
preconditioned in any way before the measurement is made. 

To normalize it to dry conditions, when the water vapor present is of a known 
and relatively fixed level, set the standard level to DRY and use a fixed value 
in the keypad option representing the expected water vapor produced for the 
fuel type. If the measurement is not to be normalized for water vapor, set the 
standard level to WET. 

With an integrated system the water vapor data can be taken to the CCO 
5500 via the serial data line. 

NOTE
The rolling average data will be cleared from memory - consider carefully 
before using this option. 

The average values that are currently held in 
the four averaging stacks can be reset using 
this option; this will erase the current average 
that is held in all of the averaging stacks. Select 
this option by pressing the ENTER key and using the ARROW keys. 
Confirmation is requested before the averages are reset.