Fluke Biomedical VT Plus HF - Manual (Page 117)

Remote Operation
Other Setup Functions
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The gas calculator allows calculation of the viscosity and molecular weight of a gas
mixture. One gas serves as a balance gas. This means that the percentage of this gas
is automatically adjusted to insure that the total percentage of gases totals 100 %.
6. Make the following changes, as necessary:
a. To change the balance gas, click the radio button to the left of the gas name.
Any of the five standard gases may be used as a balance gas.
b. Adjust the percentage of each gas in the mixture by changing the values in the
two columns to the right of the gas name. If any gas in the mixture is not one of
the five standard gases, one of the other gases may be chosen.
c. Select a gas from the list of predefined gases or, if the gas being used is not one
of the predefined gases, select the user-defined option. There are three predefined
gas options and one user-defined option.
d. Enter the molecular weight, viscosity coefficient, and viscosity intercept into the
boxes provided.
e. Click the Air button or the Respiration button to set the calculator to the
defaults for air or respiration.
f. Enter the temperature and relative humidity for both inspired and expiratory
gases in the boxes provided. Viscosity and molecular weight are calculated every
time a change is made to any of the controls.
g. When finished, click OK to accept the values and return to the Gas Settings
Data Entry dialog box. The viscosity, relative humidity, molecular weight, and
temperature populate the appropriate boxes.
7. Continue entering changes in the Gas Settings Data Entry dialog box.
8. Click OK to return to the Gas Settings dialog box.