Welch Allyn Duet CO2 Module - User Manual - Manual (Page 67)

Duet CO
2
Module OEM Implementation Manual
Welch Allyn OEM Technologies Confidential Page 67
O
2
/N
2
O/Desflurane Compensation
The presence of oxygen (O
2
), nitrous oxide (N
2
O), and desflurane at elevated concentrations affects
the measurement of CO
2
concentration. O
2
, N
2
O and desflurane compensations correct the ETCO
2
value during the presence of these interfering agents at high levels
The Duet module provides mathematical compensations that utilize midpoint correction factors for
interfering agents such as Oxygen (O
2
), Nitrous Oxide (N
2
O) and desflurane. The compensations may
be manually enabled by the user to compensate the ETCO
2
value during the presence of these
interfering agents at high levels. As the concentrations of interfering agents move away from the
midpoint values, the correction error becomes greater.
The variables and correction equations are summarized in this table.
O
2
Correction N
2
O/Desflurane Correction Operating Conditions
OFF OFF O
2
≤ 50%, no N
2
O
ON OFF O
2
> 50%, no N
2
O
OFF ON O
2
≤ 50% and N
2
O or desflurane
≥ 12%
ON ON O
2
> 50% and N
2
O or desflurane ≥ 12%
The O
2
/N
2
O/desflurane compensations are enabled/disabled by the following Function Enable/Disable
commands.
Compensation Function Enable Command
O
2
compensation OFF
O
2
compensation ON
N
2
O compensation OFF
N
2
O compensation ON
Desflurane compensation OFF
Desflurane compensation ON