Fluke VT Plus HF, Руководство оператора, Страница: 124 / 134

VT Plus HF
Operators Manual
8-34
Gas Calculator
The gas calculator allows you to calculate 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%. To change
which gas is the balance gas, click the radio button to the left of the gas’s name. Any of
the five standard gases may be used as a balance gas.
You can adjust of what percentage each gas makes up of your mixture by changing the
values in the two columns to the right of the gas’s name. If you have a gas in your
mixture that is not one of the standard five, you may use one of the user gases. The user
gases have three predefined gas options and a user-defined option. Select your gas from
the list of predefined gases or if the gas you are using isn’t one of these predefined gases,
select the user-defined option. Enter the molecular weight, viscosity coefficient, and
viscosity intercept into the boxes given. Clicking the
AIR
button or the
RESPIRATION
button will set the calculator to the defaults for air or respiration.
Enter the temperature and relative humidity for both inspired and expiratory gases in the
boxes provided. Viscosity and molecular weight are calculated every time you make a
change to any of the controls. When you are done, click the OK button to accept these
values. The viscosity, relative humidity, molecular weight, and temperature will be put
into the appropriate boxes on the
GAS SETTINGS
dialog box.
Figure 8-23: Gas Calculator Dialog Box