Gas transfer equipment specification by sampling method
| System type | Required specification | |
| Rapid gas analyser systems | Discrete sample systems | |
| Analyser specification 0%–90% response time | 150 ms | N/A |
| Maximum non-linearity | ±1% of full scale | ±1% of full scale |
| Accuracy | Within ±1% of full scale | Within ±1% of full scale |
| Interference from 5% CO2 or water vapour | <10 ppm error in CO | <10 ppm error in CO |
| Drift for carbon monoxide | <10 ppm over 30 s | <10 ppm over 30 s |
| Drift for tracer gas | <0.5% of full scale over 30 s | <0.5% of full scale over 30 s |
| Flow accuracy | ±2% over the flow range −10 to 10 L/s | ±2% over the flow range −10 to 10 L/s |
| Volume accuracy (3 L syringe) | Within ±75 mL | Within ±75 mL |
| Barometric pressure sensor accuracy | Within ±2.5% | N/A |
| Ability to perform a QA check | Calculate (Alveolar Volume) VA of 3±0.3 L and TLco of <0.166 mmol/min/kPa | Calculate VA of 3±0.3 L and TLco of <0.166 mmol/min/kPa |
| Circuit resistance | <1.5 cmH2O/L/s | <1.5 cmH2O/L/s |
| Equipment dead space | Known and <200 mL | Known and <200 mL |
| Leak | No leak | No leak |
Adapted from Graham et al.7
CO2, carbon dioxide; CO, carbon monoxide; N/A, not available; ppm, parts per million; QA, quality assurance; TLco, carbon monoxide transfer factor; VA, Alveolar Volume.