Welch Allyn Duet CO2 Module - User Manual - Manual (Page 11)

Duet CO
2
Module OEM Implementation Manual
Welch Allyn OEM Technologies Confidential Page 11
Gas Mixing
A small amount of gas “mixing” occurs as the CO
2
sample travels through the tubing to the sample
chamber. Gas mixing compensation accounts for the effect of low level gas mixing on the baseline
during inspiration in sidestream mode operation.
The gas mixing, or baseline, compensation is ON by default and cannot be disabled by the host
system.
O
2
/N
2
O/desflurane
O
2
/N
2
O/desflurane compensations account for effect of these gases on the IR absorption
characteristics of CO
2
molecules. Refer to page 67 for a description of this effect and a
recommendation for enabling these compensations.
The O
2
/N
2
O/desflurane compensation is OFF by default and may be enabled or disabled via a host
system command.
BTPS
Often the clinician’s intent is to determine the CO
2
levels within the patient’s lungs where gas exchange
is taking place. BTPS compensation corrects for the environmental differences between the
measurement site (i.e. the bench) and “deep lung” CO
2
.
The BTPS compensation is ON by default and may be enabled or disabled via a host system
command.