14
ABOUT THE VSA
Figure 12 External Gas screen to turn off gas
2.4.3.18 DIAGNOSTICS
The Diagnostics screen provides you with detailed information about all the sensors in the
instrument. Refer to Section9.1 for details on what kind of values you should expect for each
sensor. Press up or down to page between the different Diagnostics screens.
Figure 13 Diagnostics screen menu
The scale icon on the bottom of the second screen allows you to zero the balance so that
you can take weight readings via the diagnostic screen. The icon labeled “Act” toggles the
actuator system on and off. With the lid open, pressing this button causes the weigh pan and
actuator cylinder to alternatively rise and fall if working properly.
On startup, the pump is turned on and flows dry air into the chamber to monitor the
desiccating capacity of the tubes. The number button on the bottom screen allows you to
switch between the two desiccant tubes. If you press the number button with the arrow
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