Specifications
Efficia CM Series Rack and Modules Instructions for Use 9-17
CO2 Microstream™ Specifications
Calibration Interval
• First calibration at 1,200 hours of use or after one year, whichever
comes sooner.
• After the first calibration, once a year or after 4,000 hours,
whichever comes sooner.
Auto Zero Interval Once per hour (typical)
Leak Tightness < 250 mBar/min when a 30% vacuum is invoked on the flow system.
CO
2
Accuracy 0 mmHg – 38 mmHg: ±2 mmHg
39 mmHg – 99 mmHg: ± (5% of reading + 0.08 for every 1 mmHg above 38
mmHg)
100 mmHg – 150 mmHg: ± (5% of reading + 0.08 for every 1 mmHg above 38
mmHg)
As soon as a CO
2
reading is presented, the measurement is accurate to the
above specifications.
Note:
• Accuracy applies for breath rates up to 80 bpm. For breath rates above 80
bpm, accuracy is ±4 mmHg or ±12% of reading, whichever is greater for
etCO
2
values greater than 18 mmHg. To achieve the specified accuracies for
breath rates above 60 bpm, use the FilterLine™ H set for infant/neonatal
patients.
• The accuracy specification is maintained to an additional 4% of the
expected reading in the presence of interfering gases.
Drift of Measurement
Accuracy
The periodic auto zero function compensates for drifts between components,
changes in ambient temperature, and barometric conditions. This automatic
process eliminates variances that might otherwise cause measurement drift.
Therefore, the module does not exhibit drift.
Respiration Rate Range 0 rpm to 150 rpm
Respiration Test Method Breaths are simulated for use in respiration rate measurement with a system
which uses a tank of N2 (representing no CO
2
for inhalation) and a tank of CO
2
(of the % CO
2
required for the particular test). A control board, which is triggered
by a computer, uses solenoids to switch the module input between the 2 tanks
of gas, creating a gas CO
2
square wave. This system can create simulated
breaths over the full required range of specified respiration rates.
Respiration Rate Accuracy ±1 rpm in the range of 0 rpm – 70 rpm
±2 rpm in the range of 71 rpm – 120 rpm
±3 rpm in the range of 121 rpm – 150 rpm
Automatic Barometric
Pressure
The monitor is equipped with automatic barometric pressure compensation.
Effects of Cyclical
Pressure
Will operate within specifications with over-pressure and under-pressure from a
ventilation system as follows:
• Over-pressure: +100 cmH2O
• Under-pressure: –20 cmH2O
Note: With high over pressures close to the upper limit, the module may enter
into a blockage mode in order to safeguard the module from damage.
The US Patents for the microMediCO2 module are listed at: www.covidien.com/patents
1. The time before CO2 measurements are available includes power-up time and initialization time.
2. CO
2
conforms to ISO 80601-2-55.
Parameter Specification
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