Philips M3015A - Page 66

Sidestream CO
2
Measurement
50
Introduction to the Instrument
N
2
O correction is required only on M3015A Measurement Server Extensions with CO
2
Data
Acquisition hardware revision A.01.09 or lower.
• N
2
O Correction—This can be turned on or off. If N
2
O correction is off, only oxygen cor-
rection to CO
2
is made. In this case, it is assumed that the gas mixture consists mainly of O
2
and N
2
(respiratory intensive care unit conditions).
If N
2
O correction is on, oxygen and N
2
O correction to the CO
2
value is made. In this case,
it is assumed that the gas mixture consists mainly of O
2
and N
2
O (operating room condi-
tions).
• O
2
Correction— There is a fixed correction of 45% O
2
.
• Humidity Correction—This correction is selectable between Body Temperature Pressure
Saturated (BTPS) and Standard Pressure Temperature Dry (STPD). The Extension meas-
ures STPD and uses this correction formula:
BTPS = 0.94 x STPD
• Max Hold—There are three possible selections:
• Off—The ETCO
2
and IMCO2 numerics display the breath-to-breath value.
• 10 seconds—The ETCO
2
and IMCO
2
numerics display the highest/lowest value within a
moving window over a 10-second period.
• 20 seconds—The ETCO
2
and IMCO
2
numerics display the highest/lowest value within a
moving window over a 20-second period.