BD Alaris - Page 321

General Information
BD Alaris
TM
System with Guardrails
TM
Suite MX User Manual 307
All Microstream disposables contain an inline hydrophobic filter to extract condensate and/or patient
secretions while maintaining measurement and waveform integrity. For humid conditions within the
operating parameters of the EtCO
2
module and Microstream disposables, humidity has no quantitative
effect on the CO
2
concentration, given the small 50 mL/min sample size rate. In high humidity
environments or extended monitoring periods (24 - 72 hours), only Microstream disposables designed for
those instances should be used. In the event of humidity or condensate outside the EtCO
2
module’s
operating specifications, the EtCO
2
module presents a “Remove Blocked Disposable” message.
Due to the relatively small sampling size needed for EtCO
2
readings, partial pressure does not affect the
ability of the EtCO
2
module to measure EtCO
2
, as long as the 50 mL/min rate can be achieved.
Microstream disposables are single-use, disposables which must
be changed with each use. The
manufacturer’s sample flow, 50 mL/min, does not affect the disposa
bles life; however, humidity and
specific patient conditions can shorten the effective life of the disposables. Microstream disposables are
rated for up to 24 hours and 72 hours use, depending on the specific Microstream disposable.
The EtCO
2
module provides readings in compliance with BTPS (body temperature, pressure, saturation)
standards.

There is no effect on accuracy due to cyclic pressure up to 10 kPa.
NOTE:
 BTPS (body temperature, pressure, saturation assumed 37°C, 47 mmHg) calculations are made
according to:
PCO
2
= FCO
2
x (Pb - 47)
Where:
FCO
2
is fractional concentration of CO
2
in dry gas and
FCO
2
= % CO
2
/100.
Pb is ambient pressure.
PCO
2
is partial pressure of CO
2
at BTPS.