COMPASS
for molbox™ User’s Manual
Page 9
© 1998-2003
DH Instruments, Inc
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4.1
HOW DO I?
Set up and run a test?
Create a Test Definition to define the test procedure (see Section 9).
Create a DUT Definition to define a device under test (see Section 8).
Configure the test hardware to be used to run the test (see Section 10).
Run test (see Section 7.2).
Display the flow unit I want on the molbox1 or molbox RFM front panel display
during COMPASS operation?
The various COMPASS run screens, rather than the molbox display, should be used to
obtain molbox output information. COMPASS sets the molbox to fundamental mass
flow units and then performs conversions to the other units and other operating
conditions when required. Do not refer to the molbox display when you are running
COMPASS.
A list of standard mass flow units available for display on the molbox can be selected using the
[Tools], [Options, [molbox],
<Display mass flow units>
units feature (see Section 11.2).
As an alternative, press
[AVERAGE]
,
[DISPLAY]
on the molbox keypad. Select the unit of
measure that you would like displayed on the second (bottom) line of the front panel display.
(Refer to the molbox Operation and Maintenance Manual, DISPLAY Section, for details.)
Keep in mind that
COMPASS
does not transmit pressure and temperature values for
volume or actual flow units to the molbox even if
COMPASS
is making real time measurements.
Therefore, the volume flow units displayed by the molbox and by
COMPASS
will not agree.
Run a test in which the flow at each point is adjusted to a nominal flow value,
for example to the nominal point when calibrating a rotameter?
Specify “jog before dwell” in the Test Definition (see Section 9.5.6). This causes test
execution to pause at each point to allow flow adjustment (jog) prior to taking data at the
point.
Use COMPASS to run tests with a reference other than a DHI molbloc/molbox?
Though
COMPASS
only supports automated operation with
DHI
molbloc/molbox mass
flow references,
COMPASS
can be used to run manual entry tests with any flow reference.
Using the
[Setup]
,
[Hardware]
,
[Reference]
tab, set up a reference selecting
<Other>
as
the
<Manufacturer>
(see Section 10.3.3). A test can then be run in which reference flow
values are entered manually at each point. DUT readings can be automated or not as in
any other test. This feature allows
COMPASS
to be used to standardize flow calibration
procedures and data reporting even with references with which
COMPASS
cannot
interface directly. Entry of reference flow values must be in the flow units that are selected
for display on the molbox. To change these units, go to the
[Tools], [Options], [molbox]
tab and use
<Display mass flow unit>.
Summary of Contents for COMPASS FOR MOLBOX
Page 1: ...1998 2003 DH Instruments Inc COMPASS for molbox Flow Calibration Software User s Manual...
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