Specifications
296 Instructions for Use Apollo SW 4.5n
Part Number: 9053586, 3rd edition
Gas measurement
Sidestream gas measurement
The gas sampled via the water trap is returned to the breathing system and included in measurement and delivery
calculations. The inlet of the gas measurement system contains a filter in the water trap and there is a filter in the outlet of the
sample gas return. All values are measured under ATPS conditions. The sample flow is standardized to STPD conditions.
The measurement is corrected for ambient pressure.
Due to the T
10...90 time and the sampling rate, the accuracies of the measured values for O2, N2O, and anesthetic agent may
deviate at respiratory rates of 75 bpm and an I:E ratio of 1:2. The influence of respiratory rate and I:E ratio on accuracy has
been verified in a simulated breathing system using a rectangular waveform for the gas concentration.
Endtidal measured values are calculated for each breath from the local maxima and minima of the realtime measurements
during expiration. If CO
2 respiratory phases are detected, the sample flow is compensated during ventilation and flow
measurement.
Time after switch-on until the specified accuracy
is attained
Less than 500 s
Sensor sampling rate <50 ms
Time until CO
2 measured values are displayed 95 s
Maximum time until emptying of the water trap is
necessary
41 h (sample gas under BTPS
conditions, ambient air 23 °C
(73.4 °F))
Sampling rate
1)
150 mL/min ±20 mL/min 200 mL/min ±20 mL/min
Delay for sampling (typical value, depends on
sample line)
less than 4 seconds less than 4 seconds
Response time t
10..90 O2
gas measurement module with consumption-free
O
2 measuring
not applicable less than 500 ms
Response time t
10..90 CO2 less than 500 ms less than 350 ms
Response time t
10..90 anesthetic agents less than 500 ms less than 500 ms
Response time t10..90 N2O less than 500 ms less than 500 ms
Total system response time
(acc. to ISO 80601-2-55)
approx. 4.5 s approx. 4.5 s
1) The respective value depends on the patient-gas measurement module (PGM) used which is displayed on the System Information page.
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