Patient Monitor User Manual Product Specification
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Fi and ET
IRMA AX+: CO
2
, N
2
O, primary and secondary agents (HAL, ENF,
ISO, SEV, DES)
Fi and ET are displayed after one breath and have a continually
updated breath average.
The following method is used to calculate end-tidal (ET) values:
- CO
2
: The highest concentration of CO
2
during one breathing cycle
with a weight function applied to favor values closer to the end of
the cycle.
- N
2
O and anesthetic agents: The momentary gas concentration at
the time point where ETCO
2
is detected.
ET-values for anathesthetic agents and N
2
O (IRMA AX+) will
typically decrease below nominal value when respiration rate
exceeds 80 bpm. The maximum decrease is described by the
formula ET = 80*ET
nom
/RR.
ETCO
2
will be within specification for all respiration rates up to 150
bpm. (Measured at I/E ratio 1:1 using breath simulator according to
EN ISO 80601-2-55 fig. 201.101.)
Automatic agent
identification
Primary and secondary agents
Probe
2-9 channel NDIR type gas analyzer measuring at 4-10
μ
m. Data
acquisition rate 10 kHz (sample rate 20 Hz / channel). Pressure,
temperature and full spectral interference correction.
Calibration Zeroing
recommended
when
changing Airway adapter. No span
calibration required for the IR bench.
Warm-up Time
< 20 seconds (agent identification enabled and full accuracy)
Rise Time (@ 10 l/min) CO
2
≤
90 ms
N
2
O
≤
300 ms
HAL, ISO, ENF, SEV, DES
≤
300 ms
(Measured @ 10 l/min with gas concentration steps corresponding
to 30% of total measuring range for each gas.)
Primary Agent
Threshold
0.15 vol%. When an agent is identified, concentrations will be
reported even below 0.15 vol% as long as apnea is not detected.
Secondary Agent
Threshold
0.2 vol% + 10% of total agent concentration
Agent Identification
Time
< 20 seconds (typically < 10 seconds)
Total System Response
Time
< 1 second (Measured according to EN ISO 80601-2-55.)
