7-6
7.2.2.3 Set BTPS Compensation
The CO
2
module is configured to compensate CO
2
readings for either Body Temperature and
Pressure, Saturated Gas (BTPS), to account for humidity in the patient’s breath, or Ambient
Temperature and Pressure, Dry Gas (ATPD).
1. ATPD:
100/%)()(
22 ambco
PvolCOmmHgP
2. BTPS:
100/)47(%)()(
22
ambCO
PvolCOmmHgP
where,
2CO
P
= partial pressure,
%vol
= CO
2
concentration,
amb
P
= ambient pressure, and
unit is mmHg.
For CO
2
module, BTPS compensation is switched on or off based on the actual situations.
1. Select the [Setup] key→[Sensor]→[CO2 Module].
2. Set [BTPS Comp] to [ON] or [OFF] in either BTPS or ATPD.
7.2.2.4 Set Unit
1. Select the [Setup] key→[Maintain]→[User]→enter the required password→[Setting]
→[Unit].
2. Set [CO
2
Unit] to [mmHg], [kPa] or [%].
7.2.2.5 Set CO
2
Waveform
Refer to 5.1.1 to set CO
2
waveform.
7.2.3 Measurement Limitations
Measurement accuracy may be compromised due to:
Leakage or internal leakage of the sample gas
Mechanical shock
Cyclic pressure which is greater than 10 kPa (100 cmH
2
O)
Other interference source (if available)
Measurement accuracy may be affected by the breath rate and I/E ratio as follow:
EtCO
2
is within specification for breath rate ≤60 bpm and I/E ratio ≤1:1;
EtCO
2
is within specification for breath rate ≤30 bpm and I/E ratio ≤2:1.
Measurement accuracy is unspecified for breath rate larger than 60 bpm.
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