V Series Operating Instructions 29 - 43
Product Specifications Carbon Dioxide (CO2) Performance
System Response Time
Initialization Time
Before the module begins to measure CO
2
, it completes self-test and initialization procedures
required for proper operation.
CO
2
Reporting Resolution
The CO
2
reporting resolution is 0.1 mmHg.
Self-Maintenance (SFM) Interval
3. Maximum emptying interval during normal use (sample gas 37 °C, 100% RH)
Invalid Data: Invalid data displayed as (--).
CO
2
Calibration Interval: No routine calibration is required.
The module should initially be calibrated after 1200 operating hours,
then once a year or after 4,000 operating hours, whichever comes first.
System Response Time: The system response time (with a standard-length FilterLine) which
includes the delay time and rise time (10% to 90%) in response to a step
change in the CO
2
concentration is 2.9 seconds typical. Rise Time Adult
and Neonatal: 190 mSec max.
Delay Time: 4.9 seconds typical
Self-M aintenan ce I nter va l (SFM): Se lf-M aintenance (SFM ) is per fo rme d only du ring m easurement
mode. The module performs one or more of the following:
Ambient pressure measurement
Auto zero (AZ)
Flow test
SFM is triggered:
• During the first hour after entering measurement mode,
periodically for durations of typically 10 seconds at a rate which
limits the total time consumed by SFMs to less than 2% of the time
in which active measurements are taken. Following the first hour
after entering measurement mode, periodically for durations of
typically 10 seconds at a rate of at most once per hour.
• If a change of 8 °C from the last AZ is detected.
• If pressure change of 20 mmHg relative to the last ambient
pressure measurement (less than the purge threshold) for a period
of 30 seconds is detected. The module will be able to detect a real
change in the ambient pressure and a pressure change due to
partial blockage of the FilterLine.
• The module prevents the triggering of an SFM in the following
situations:
• In case of purging until the end of this state.
• During a breath absence period which follows a valid breath.While
waiting a minimum of 20 seconds for host SFM enable command.
(After the 20-second opportunity given to the host to schedule the
SFM passes, the module schedules the SFM according to a priority
determined by current conditions).