15-16
Other Setup
Selecting the OTHER SETUP option opens the following menu.
Figure 15-9 CO
2
Other Setup Menu
You can perform the following settings in this menu.
îš„ MAX HOLD
If Max Hold is configured to 10 sec or 20 sec, the etCO2
numeric shows the highest CO2 value measured within the
previous 10 or 20 seconds. If set to Off the etCO2 numeric
shows breath-to-breath value.
îš„ BTPS
Body temperature and pressure, Saturated
Options: ON and OFF.
When BTPS is turned ON, the system performs BTPS compensation automatically; when BTPS
is turned OFF, the BTPS compensation is disabled.
When measuring the CO
2
content inside the patient’s lung, turn ON BTPS. Normally, the lung
temperature of the patient is 37℃ and the water vapor is sufficient or regarded as saturated. But
the temperature and water vapor content of the sampling line are different from the patient’s
exhalation. Thus, when the patient’s exhalation passes the sampling line, the accuracy of the CO
2
concentration measured by the sensor will be adversely affected. To ensure an accurate
measurement, you should turn ON the BTPS. In this mode, the system adjusts the calculation
coefficient automatically, so that the measured value is just the actual CO
2
content in the patient’s
lung.
When measuring the CO
2
content of the environment or a certain vessel, turn OFF BTPS. In the
standard ambient pressure and dry gas, the accuracy of the sensor measurement is not affected.
NOTE
z When measuring a moist gas of saturated water vapor at the body temperature
and the ambient pressure, turn ON BTPS; when measuring a dry gas at the
ambient temperature and pressure, turn OFF BTPS.
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