2. Amperometric measuring principles ABL800 FLEX Reference Manual
Metabolite electrodes, Continued
where:
Sensitivity
(continued)
cX(Cal 1) = Actual concentration of glucose/lactate in the Cal 1
solution.
I
0
(final) = Extrapolated final zero current value of the metabolite
electrode at the time of the last updating.
TI(Cal 1)
= electrode current due to presence of glucose/lactate.
The sensitivity limits of the metabolite electrodes are as follows:
Electrode Sensitivity Limits
Glucose 100 - 1800 pA/mM
Lactate 150 - 2000 pA/mM
Drift
The drift in the sensitivity of the metabolite electrodes is calculated from the
following equations:
1)X(Cal
Sens
(final)Ifinal)1,I(Cal
Drift
0
c−
=
where:
I(Cal 1,final) = Current at the final measurement on Cal 1 solution.
Sens = Sensitivity of the glucose/lactate electrode from the previous
calibration.
cX(Cal 1) = Actual concentration of glucose/lactate in the Cal 1 solution.
I
0
(final) = Extrapolated final zero current value of the metabolite
electrode measured at the time of the last updating.
The default drift tolerances set by Radiometer for the metabolite electrodes are:
± 0.5 mM for the glucose electrode
± 0.2 mM for the lactate electrode.
Continued on next page
2-16
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