COMPASS
for molbox™ User’s Manual
Page 35
© 1998-2003
DH Instruments, Inc
.
Table 4.
<Tare molbox>
Panel Fields
LABEL
DESCRIPTION
Red/Green
Circular Ready
Indicator
This indicator is green only when the pressure rate of change is within the
molbox’s internal tare rate criterion. In this state, the
<Tare>
button is enabled.
When the indicator is red, the
<Tare>
button is disabled.
Pressure Rate
(Pa/s)
Current differential pressure rate of change.
Differential
Pressure (Pa)
Non-tare corrected differential pressure. After taring, this pressure value
should be equivalent to the
<Previous Tare>
display.
Previous Tare
(Pa)
Value of the old tare. This value is updated each time the tare button is pressed.
Microrange
Pressure (Pa)
Current molbox RFM microrange option pressure. If the microrange is not
supported by the molbox, this field displays as N/A. After taring, this pressure
value should be equivalent to the
<Previous Microrange Tare>
display.
Previous
Microrange Tare
(Pa)
Value of the old microrange tare.
Downstream
Pressure
Instantaneous downstream pressure. This value is corrected by ½ of the
current tare value.
Upstream
Pressure
Instantaneous upstream pressure. This value is corrected by ½ of the current
tare value.
6.6.3 PURGE
FUNCTION
The molbox purge function is represented by the toolbar icon:
See the molbox Operation and Maintenance Manual, Purge Section, for a complete description
and recommendations concerning use of the molbox purge function.
Use this function to purge the molbox of residual gases when flowing a new gas. Before activating
this function make sure a flow has been set. When activated, a prompt allows the entry of
the desired purging time, typically 30s should is sufficient. However, the actual purging time
is dependent on the calibration gas and the volume of the system.
6.6.4 LEAK
TEST
The molbox leak test function is represented by the toolbar icon:
See the molbox Operation and Maintenance Manual, Leak Test Section, for a complete
description of the molbox leak check functions and instructions on their use.
COMPASS
uses the molbox System Leak Test. The leak test takes 60s. During this time
the molbox embedded software monitors the pressure changes. It then outputs a leak status
based on the results.
Summary of Contents for COMPASS FOR MOLBOX
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