Super Systems MGA6010 - Manual (Page 29)

MGA 6010 Operations Manual
Super Systems Inc. Page 29 of 54
In this menu, there are two factors that will influence the calculation of carbon: IR Shim Factor and CH
4
Factor. Each of these factors is incorporated in the equation used to calculate %C; they are described in
further detail below. The calculation factors should be changed only after determining that additional
adjustments are required based on the specific conditions and equipment at each facility. Neither of them
should be modified without significant testing or consultation from Super Systems, Inc.
IR Factor
This setting determines which of two parameters is incorporated in the %C calculation: CO Factor or
Process Factor (PF).
IR Shim Factor
Changing the IR Shim Factor is a way of modifying the computed percent carbon. The nominal value is
180. There is an inverse relationship between the IR Shim Factor and computed percent carbon. To
increase the computed percent carbon, this number should be lowered, and to decrease the computed
percent carbon it should be increased.
CH
4
Factor
This factor increases or decreases the significance of CH
4
in the calculation of carbon. CH
4
does not have
a significant impact on the computed percent carbon, so it has a minor role in the equation. If the
measured gas has over 5% CH
4
, its role in the equation may become greater than it should be. In these
cases the CH
4
factor should be reduced. In cases where the CH
4
is present in excess of 7 or 8%, this
factor can be reduced to zero.
Current Working IR Factor
This field shows the current IR Shim Factor adjustment value. It is not directly modifiable.
Three Methods of %Carbon Calculation
The MGA 6010 is able to calculate %Carbon using one of three methods: Default Settings, IRF Matrix, or
Equipment-Specific IRF Matrices.
1. Default Settings. This is the method used when Use IRF Matrix is set to False (off). The sample
gas composition (%CO, %CO
2
, %CH
4
) and temperature, along with the programmed IR Shim
Factor and CH
4
Factor, are used to arrive at a calculation of atmospheric %Carbon.
2. IRF Matrix. When Use IRF Matrix is set to True (on), the MGA 6010 will use values configured in
the IRF Adjustment Matrix to set the current IR Shim Factor. Configuring the adjustment matrix
is described in more detail in the IRF Adjustment Matrix section below.
3. Equipment Specific IRF Matrices. This method allows you to configure an IRF Matrix specific to a
configured piece of equipment and change the calculation method based on the equipment whose
gas composition is being analyzed. This method is described in more detail in the Equipment
Specific IRF Matrices section below.
IRF Adjustment Matrix
The IRF Adjustment Matrix, sometimes referred to simply as the IRF Matrix, is used to set conditions
under which the IR Shim Factor will be changed. Using the IRF Matrix, a total of 16 different IR Shim
Factors can be configured if both temperature and atmosphere are considered; a total of 4 different IR
Shim Factors can be configured if only temperature is considered. NOTE: Use IRF Matrix must be set to
“True” for this function to be used.