ABL800 FLEX Reference Manual 2. Amperometric measuring principles
Metabolite electrodes, Continued
Corrections
(continued)
ABL8XX
FLEX
Mode A
0
A
1
Equation
05 S165 0.97 -0.04 A
S95 1.03 0.03 A, B
C95 1.03 0.18 A, B
C35 1.13 0.05 A, B
*FM (no message) 0.97 -0.04 A
*FM (message 874) 1.03 0.18 A, B
*FM (message 873) 1.03 0.18 A, B
*FLEXMODE = adaptive measuring mode.
Stability criteria
The following stability criteria must be met to obtain a stable electrode response
during calibration:
I(Cal 1,upd.30) − I(Cal 1, upd.21) − 9 × I
slope
≤ 0
S
d,zero
< S
d,max
50
upd.21)1,I(Calupd.11)1,I(Cal
upd.11)1,I(Calupd.1)1,I(Cal
log
5.9
≤
−
−
−
=
τ
All of the three criteria must be fulfilled for a calibration using Cal 1 solution
where:
I(Cal 1,upd.30)
I(Cal 1,upd.21)
I(Cal 1,upd.11)
I(Cal 1,upd.1)
= Electrode current at the 30
th
/21
st
/11
th
/1
st
updating during
measurement on Cal 1 solution, respectively.
S
d,zero
= Spreading of the zero point current updatings around the
regression line.
S
d,max
=
If Sens > 400 pA/mM, then
= 0.025 × Sens,
otherwise
= 10.0.
maxd,
S
maxd,
S
Continued on next page
2-19
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