31 Installation and Specifications Measurement Specifications
318
Microstream CO
2
Humidity Correction Factor
Either BTPS or ATPD can be selected as the humidity correction factor for the Microstream CO
2
readings. The formula for the correction calculation is:
P
BTPS
= (P
ATPD
.
0.94)
Microstream CO
2
Performance Specifications
CO
2
Range 0 to 150 mmHg (0 to 20 kPa), or 20 % CO
2
, whichever is lower
Accuracy Up to 5 minutes during warmup: ±4 mmHg or 12 %, whichever is greater
After 5 minutes warmup:
0 to 40 mmHg (0 to 5.3 kPa):±2.2 mmHg (±0.3 kPa)
Above 40 mmHg (5.3 kPa):±(5.5 % + (0.08 %/mmHg above 40 mmHg)) of
reading
These specifications are valid for 21 % O
2
and N
2
balance, up to 35C
ambient temperature, up to 60 rpm in adult mode and 100 rpm in neonatal
mode.
Outside of these conditions the accuracy reaches at a minimum
±4 mmHg or ±12 % of the reading, whichever is greater.
Resolution Numeric: 1.0 mmHg (0.1 kPa)
Wave: 0.1 mmHg (0.01 kPa)
Stability Included in Accuracy specifications
awRR Range 0 to 150 rpm
Accuracy 0 to 40 rpm: ±1 rpm
41 to 70 rpm: ±2 rpm
71 to 100 rpm: ±3 rpm
>100 rpm: ±5 % of reading
Warm-up Time 5 minutes for full accuracy specification
Rise Time 190 ms for neonatal mode
(measured with FilterLine H for neonatal)
240 ms for adult mode
(measured with FilterLine H for adult)
Sample Flow Rate 50 + 15/-7.5 ml/minute
Gas Sampling Delay Time Typical:2.3 seconds
Maximum:3 seconds
Sound Pressure Acoustic noise: <45 dBA
Total System Response Time The total system response time is the sum of the delay time and the rise time.
Mainstream CO
2
Performance Specifications
CO
2
Range 0 to 150 mmHg (0 to 20.0 kPa)
Accuracy
after 2 minutes warmup:
For values between 0 and 40 mmHg:±2.0 mmHg (±0.29 kPa)
For values from 41 to 70 mmHg: ±5 % of reading
For values from 71 to 100 mmHg: ±8 % of reading
The specifications are valid for standard gas mixtures, balance air, fully
hydrated at 35°C, P
abs
= 760 mmHg, flow rate = 2 l/min.
Resolution
Numeric: 1.0 mmHg (0.1 kPa)
Wave: 0.1 mmHg (0.01 kPa)
Stability:
Short term drift
Long term drift
±0.8 mmHg over four hours
Accuracy specification will be maintained over a 120 hour period