Dräger Primus SW 4.5n Instructions For Use Manual page 251

Frequency measurement
Frequency (Freq.)
Measuring range
Resolution of the displayed value
Accuracy
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 sam-
ple flow is standardized to STPD conditions.
The measurement is corrected for ambient pressure.
Due to the T time and the sampling rate, the accuracies of the measured values for O
10...90
anesthetic agent may deviate at respiratory rates of 75 /min and an I:E ratio of 1:2. The influence of res-
piratory rate and I:E ratio on accuracy has been verified in a simulated breathing system using a rectan-
gular waveform for the gas concentration.
Endtidal measured values are calculated for each breath from the local maxima and minima of the real-
time measurements during expiration. If CO
pensated during ventilation and flow measurement.
Time after switch-on until the specified ac-
curacy is attained
Sensor sampling rate
Time until CO measured values are dis-
2
played
Maximum time until emptying of the water
trap is necessary
1)
Sample rate
Delay for sampling (typical value;
depends on sample line used)
1) The respective value depends on the PGM used which is displayed on System Information page.
Instructions for use Primus SW 4.5n
1 to 100 per minute
1 per minute
±10 % or ±1 per minute,
the lower value applies (6 to 100 per minute)
±0.3 per minute (<6 per minute)
respiratory phases are detected, the sample flow is com-
2
Less than 500 ms
<50 ms
95 s
41 h (sample gas under BTPS conditions, ambient air 23 °C)
150 mL per minute
±20 mL per minute
Less than 4 seconds
Technical Data
, N
2 2
200 mL per minute
±20 mL per minute
Less than 4 seconds
O, and
251