DH Instruments COMPASS FOR MOLBOX, Руководство пользователя

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COMPASS

for molbox™ User’s Manual
Page 155
© 1998-2003 DH Instruments, Inc .
Table 55. <Flow Unit Editor> Panel Fields
FEATURE DESCRIPTION
Flow Unit
(drop down list
box)
When the editor is in view mode , the list of currently supported flow units is in the drop down
list. The settings for each flow unit appear in the corresponding portions of the flow unit
editor.
When the editor is in edit mode , the field is disabled when the <User Defined Flow Unit>
option is not checked. In this case, COMPASS displays the default flow unit name based on
the current <Base Unit> . If a user defined unit is being set up, the name of the user defined
unit should be entered in this field.
No two flow units can share the same <Flow Unit> value.
User defined
flow unit
(check box)
When checked, the <Unit Multiplier> value is active and the <Flow Unit> field represents
the manually entered flow unit name. If this option is not checked, COMPASS uses the
default flow unit name based on the <Base Unit> .
Flow units can be renamed by checking this option and leaving the <Unit Multiplier> equal to 1.
This enables the <Flow Units> f ield for input.
Base Unit
(drop down list
box
A list of standard mass and volume or actual flow units are selectable in this list. All user
defined flow units are derived from these units. Volumetrically based mass flow units such
as, “
slm ” and “ sccm ”, require reference pressure and temperature entries. Actual flow units
such as “ alm ” and “ accm ” require data acquisition of pressure and temperature. The
<Pressure Measurement> and <Temperature Measurement> selections in [Setup],
[System] determine whether or not these are read automatically or entered manually in
COMPASS run modes (see Section
10.2
).
Reference
Temperature
(numeric entry
field/drop down
list box)
The reference temperature for a volumetrically based mass flow unit (do not confuse the flow
unit of measure reference temperature with the DUT’s normal operating temperature, see
Section 8.5.3). This field is enabled only when a volumetrically based mass flow units such
as ”
slm ” or “ sccm ” is selected.
When an actual flow unit such as “ alm ” or “ accm ” is selected, data acquisition of the actual
DUT gas temperature is required in COMPASS run modes.
Reference
Pressure
(numeric entry
field/drop down
list box)
The reference pressure for a volumetrically based mass flow unit (do not confuse the flow
unit of measure reference temperature with the DUT’s normal operating pressure, see
Section 8.5.3). This field is enabled only when a volumetrically based mass flow unit such as
”
slm ” and “ sccm ” is selected.
When an actual flow unit such as “ alm ” or “ accm ” is selected. Data acquisition of the actual
DUT gas pressure is required in COMPASS run modes.
Unit Multiplier
(check box)
Defines the value by which to multiply the base flow unit to obtain the user defined flow unit.
Most conversions consist of time and/or volume translations; e.g. seconds or hours and/or
cubic centimeters to cubic meters. However, any translation can be made. Use dimensional
analysis to determine the required multiplier to create the new flow unit. Make sure the unit
is appropriately named.