Advertisement
Chapter 22:Technical Specifications
Degree of protection against harmful
ingress of water or particulate matter
Method of sterilization
Mode of operation
Data output
Breath detection
1
Respiration rate
2
Fi and ET
Fi and ET are displayed after one breath and have a continually updatedbreath average.
The following methods are used to calculate end-tidal (ET) values:
- CO2: The highest concentration of CO2 during one breathing cycle with a weight function applied to favor values closer to
the end ofthe cycle.
-N2O and anesthetic agents: The momentary gas concentration at the time point where ETCO2 is detected.
ET-values for anaesthetic agents and N2O (IRMA AX+) will typically decrease below nominal value when respiration rate
exceeds 80 bpm. The maximum decrease is described by the formula ET = 80*ETnom/RR.
ETCO2 will be within specification for all respiration rates up to 150 bpm (IRMA AX+ and IRMA CO2)
Automatic agent identification
Gas Analyzer
Probe
Calibration
Warm-up time
3
Rise time
(@10 l/min)
Primary agent threshold
Secondary agent threshold
Agent identification time
4
Total system response time
Accuracy - standard conditions
The following accuracy specifications are valid for dry single gases at 22 ± 5 °C and 1013 ± 40 hPa
Gas
CO2
N2O
HAL,ISO,ENF
SEV
DES
Accuracy - all condition
The following accuracy specifications are valid for all specified environmental conditions except for
interference specified in the table "Interfering gas effects" and the section "Effects from water vapor
partial pressure on gas readings" below.
Gas
CO2
1
Measured at I/E ratio 1:1 using breath simulator according to EN ISO 80601-2-55 fig. 201.101.
2
Measured at I/E ratio 1:1 using breath simulator according to EN ISO 80601-2-55 fig. 201.101.
3
Measured @ 10 l/min with gas concentration steps corresponding to 30% of total measuring range for each gas.
4
Measured according to EN ISO 80601-2-55.
(Infant Airway Adapter recommended for Tracheal Tube ID size = 4 mm)
IPX4
The IRMA system contains no sterile parts.
CONTINUOUS OPERATION
Adaptive threshold, minimum 1 vol% change in CO2 concentration.
0–150 ±1 bpm. The respiration rate is displayed after three breaths and the
average value is updated every breath.
IRMA AX+: Primary and secondary agent.
2-9 channel NDIR type gas analyzer measuring at
4-10 µm. Pressure, temperature and full spectral interference correction.
Zeroing recommended when changing Airway adapter (IRMA AX+)
No span calibration required for the IR bench.
IRMA CO2: < 10 seconds (concentrations reported and full accuracy)
IRMA AX+: < 20 seconds (concentrations reported, automatic agent
identification enabled and full accuracy)
CO2 ≤ 90 ms
N2O ≤ 300 ms
HAL, ISO, ENF, SEV, DES ≤ 300ms
0.15 vol%. When an agent is identified, concentrations will be reported
even below 0.15 vol% as long as apnea is not detected.
0.2 vol% +10% of total agent concentration
<20 seconds. (Typically < 10 seconds)
< 1 second
Range
0 to 15 vol%
0 to 100 vol%
0 to 8 vol%
0 to 10 vol%
0 to 22 vol%
Accuracy
±(0.3 kPa + 4% of reading)
Accuracy
±(0.2 vol% +2% of reading)
±(2 vol% +2% of reading)
±(0.15 vol% +5% of reading)
±(0.15 vol% +5% of reading)
±(0.15 vol% +5% of reading)
22-6
User Manual
Advertisement
Chapters
