ABL800 FLEX Reference Manual 1. Potentiometric measuring principles
pCO
2
electrode, Continued
Stability criteria
(continued)
Expired air samples:
Measurement on an expired air sample is accepted if the following criterion is
fulfilled:
⏐pCO
2
(sample,upd.30) − pCO
2
(sample,upd.24)⏐≤0.40 kPa (3.0 mmHg)
or
⏐pCO
2
(sample,upd.30) − pCO
2
(sample,upd.24)⏐≤0.04 × pCO
2
(sample,upd.30).
Error message "Measurement unstable" (=
pCO
2
response fault during electrode
monitoring in Expired air mode) is displayed if the stability criterion is not
fulfilled.
1-21
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