RADIOMETER ABL800 FLEX - Page 50

ABL800 FLEX Reference Manual 2. Amperometric measuring principles
pO
2
electrode, Continued
Stability criteria
(continued)
The following stability criteria must be met in order to obtain a stable electrode
response during
measurement:
δ=|pO
2
(sample,upd.30) − pO
2
(sample,upd.1)|
For δ
Criterion
≤ 2.66 kPa
80.0)upd.16(sample,O(sample)O
22
≤− pp
> 2.66 kPa
6.0
upd.6)(sample,O)upd.18(sample,O
)upd.18(sample,O)upd.30(sample,O
2.0
22
22
<
−
−
≤−
pp
pp
For δ > 2.66 kPa:
if the following criteria are fulfilled then no result is reported:
0.1
upd.6)(sample,O)upd.18(sample,O
)upd.18(sample,O)upd.30(sample,O
22
22
−<
−
−
pp
pp
or
6.0
upd.6)(sample,O)upd.18(sample,O
)upd.18(sample,O)upd.30(sample,O
22
22
≥
−
−
pp
pp
Expired air samples:
Measurement on an expired air sample is accepted if the following criterion is
fulfilled:
⏐pO
2
(sample,upd.30) − pO
2
(sample,upd.24)⏐≤0.80 kPa/6.0 mmHg,
or
⏐pO
2
(sample,upd30) − pO
2
(sample,upd.24)⏐≤0.05 × pO
2
(sample,upd.30).
Error message "Measurement unstable" (= pO
2
response fault during electrode
monitoring in Expired air mode) is displayed if the stability criterion is not
fulfilled.
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