Mindray VS 8A, Operator'S Manual

Page: 138 / 278

12 - 6
■
ATPD:
■
BTPS:
Where, = partial pressure, = CO
2
concentration, = ambient pressure,
and unit is mmHg.
To set the humidity compensation, follow this procedure:
1. Select the CO
2
numeric area or waveform area to enter the CO2 menu.
2. Select Setup tab.
3. Set BTPS Compensation to On or Off .
12.7.6 Setting Gas Compensation
The presence of interfering gas affects the CO
2
measurement. To get the best possible
measuring result, it is needed to set the gas compensation. The configured
concentration of the interfering gas should be in accordance with its actual proportion.
WARNING
•
Make sure to use the appropriate compensations. Inappropriate
compensations may cause inaccurate measurement values and result in
misdiagnosis.
To set the gas compensation, follow this procedure:
1. Select the CO
2
numeric area or waveform area to enter the CO2 menu.
2. Select Setup tab.
3. Set the O
2
, N
2
O and AG compensation according to the actual amount of the
respective gas in the ventilation gas mixture.
12.7.7 Automatic Barometric Pressure
The CO
2
module has the function of automatic barometric pressure compensation.
12.7.8 Calibrating the CO
2
Module
A calibration should be performed once a year or when the readings go far beyond the
range. To calibrate the CO
2
module, contact your service personnel.
CAUTION
•
Connect the gas outlet to the scavenging system when calibrating the CO
2
module.
P
co2
mmHg
( )
CO
2
vol%
( )
P
amb
100
⁄ ×
=
P
co2
mmHg
( )
CO
2
vol%
( )
P
amb
47
–
( )
100
⁄ ×
=
2
CO
P
%
vol
amb
P