ABL800 FLEX Reference Manual 1. Potentiometric measuring principles
pCO
2
electrode, Continued
Corrections -
blood samples
(continued)
ABL8XX
FLEX
Mode A
o
A
1
A
2
A
3
B
0
B
1
Eq.
05 S165 -0.003573 1.1126 0.0051 -0.0000002 A
S95 -0.003573 1.1126 0.0051 -0.0000002 1.000 -0.016 A, B
S85 -0.003573 1.1126 0.0051 -0.0000002 A
C95 -0.003573 1.1126 0.0051 -0.0000002 1.013 0.010 A, B
C55 -0.003573 1.1126 0.0051 -0.0000002 1.12 -0.28 A, B
*FM (no
message)
-0.003573 1.1126 0.0051 -0.0000002 A, B
*FM (message
874)
-0.003573 1.1126 0.0051 -0.0000002 1.013 0.010 A, B
*FM (message
873)
-0.003573 1.1126 0.0051 -0.0000002 1.013 0.010 A, B
*FM (message
872)
-0.003573 1.1126 0.0051 -0.0000002 1.0884 -0.1619 A, B
*FM (message
871)
-0.003573 1.1126 0.0051 -0.0000002 1.090 -0.150 A, B
00
*FM = FLEXMODE.
The pCO
2
measured from the sample is then corrected for systematic deviations
from the reference method using the following equation:
Corrections -
expired air
samples
)OH(A(sample)COAcorr)(sample,CO
21202
pBpp
Equation A
where:
pCO
2
(sample) = uncorrected pCO
2
value of a expired air sample
pCO
2
(sample,corr) = corrected pCO
2
value of a expired air sample
A
0
= instrument dependent correction factor
A
1
= instrument-dependent correction factor
B
= barometric pressure during the measurement
pH
2
O
= partial pressure of saturated water vapour = 6.2751 kPa
ABL8XX
FLEX
Mode A
0
A
1
Equation
All Expired air 1.0196 -0.00106 A
Continued on next page
1-19