10 Product Specifications
10-2. Principle of this product
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i
i
Sonic
'
x
k
Q
Q
(2)
where
x
i
represents the volume fraction of interference gas component i, and
k
i
and
k'
i
represent the error
coefficients caused by interference gas component i.
The error coefficients
k
i
and
k'
i
represent the "distances" in a vertical axis direction from the component i to
the straight lines drawn by the functions
Q
Sonic
and
Q
Opt
in the graphs shown in Figures 1 and 2.
RIKEN KEIKI has discovered a correlation in which the ratio of
k
i
to
k'
i
is approximately constant,
regardless of the types of interference gases.
i
i
'
k
k
(3)
Using the relational formula (3), the formula (2) can be written as follows:
i
i
Sonic
x
k
Q
Q
(4)
The
formulas (1) and (4) can be used to derive the relational formula of the Opt-Sonic calculation for
obtaining calorific value.
1
Sonic
Opt
Opt
Q
Q
Q
Q
(5)
Figure 3 shows the correlation between the Opt-Sonic calculation and calorific value.
Not only the paraffinic hydrocarbon gases but also the components N2, O2, CO2, and CO are on one
straight line, demonstrating that the influences of interference gases have been effectively removed.
Figure 3: Correlation between Opt-Sonic calculation and calorific value
Содержание OHC-800
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