The selections and values entered in this tab affect only the language used in HW5 menus and the unit system and fixed pressure value used by the Psychrometric Conversion Tool. This tab has no effect on the instruments and devices in the tree. When HW5 displays or records data from any instrument, both the unit system and any fixed pressure value are determined by the configuration of the instrument.
HW5 Settings
Language selection
•Click on the underlined link to change the language used in the HW5 menus and forms to one of the available languages. The link opens the folder where the language files are located (these files have the extension .txt as in English.txt). To change the language, simply click on the appropriate file. The selection made here has no effect on the devices in the tree. Note: After changing the language selection, you should close and re-open HW5 to ensure a complete updating of all HW5 texts.
Unit System
•Use the underlined links to the right of the form to globally change the unit system used within the HW5 Psychrometric Conversion Tool. The English the unit system offers two choices: In Hg or PSI for pressure. Choose a unit by clicking on the arrow to the right of each text box. Relative humidity: the symbol to be used after the % symbol (RH) should be typed in the text box.
Constants
Fixed pressure value
•Enter here the default fixed pressure value that will be used within the HW5 Psychrometric Conversion Tool to compute calculated parameters such as wet-bulb temperature, mixing ratio, etc. The barometric pressure value can be temporarily changed from within the Tool but it reverts to the default value each time the Tool is opened.
The numerical value entered here should be consistent with the pressure unit that was selected under Unit System.
Activation energy
•Enter here the value to be used in the calculation of the mean kinetic temperature (MKT). The activation energy should always be entered in kJ/mole, regardless of which unit system (metric or English) is being used. Typically, a value between 60 and 100 kJ/mole may be used for liquids and solids.