A-12
A.7.8 CO
2
Measurement mode Sidestream, microstream
Technique Infrared absorption
Sidestream CO
2
Module
Standard Meet standard of ISO 21647
CO
2
Measurement range 0 to 99 mmHg
Accuracy*
0 to 40 mmHg:
41 to 76 mmHg:
77 to 99 mmHg:
±2 mmHg
±5% of the reading
±10% of the reading
Accuracy drift Meet the requirement for measurement accuracy within 6 hours
Resolution 1 mmHg
Sample flowrate 70 ml/min, 100 ml/min
Sample flowrate tolerance 15% or 15 ml/min, whichever is greater.
Warm-up time
Iso accuracy mode: ≤45s
Full accuracy mode: ≤10 min,
Rise time
Measured with a watertrap and a 2.5-meter sampling line
<400 ms @ 70 ml/min
<330 ms @ 100 ml/min
<300 ms @ 120 ml/min
<240 ms @ 150 ml/min
Gas sampling delay time
Measured with a watertrap and a 2.5-meter sampling line:
<4 s @ 100 ml/min
<4.5 s @ 70 ml/min
awRR measurement range 0 to 120 rpm
awRR measurement precision ±2 rpm
Apnea time 10 s, 15 s, 20 s, 25 s, 30 s, 35 s, 40 s
Note: The response time is the sum of the rise time and the delay time.
Effect of interference gases on CO
2
measurements
Gas Concentration (%) Quantitive effect*
N
2
O ≤60
±1 mmHg
Hal ≤4
Sev ≤5
Iso ≤5
Enf ≤5
Des ≤15 ±2 mmHg
*: means an extra error should be added in case of gas interference when CO
2
measurements are performed between
0-40mmHg.
Alarm limit Range Step
EtCO
2
High (low limit + 2) to 99 mmHg
1 mmHg
EtCO
2
Low 1 to (high limit - 2) mmHg
FiCO
2
High 1 to 99 mmHg
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