VICI 235 Dynacalibrator - Manual (Page 22)

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Status indicator
A red indicator means Not Ready, which can reflect one or more of the following:
• Flow outside of tolerances
• Temperature outside of tolerances
• Equilibration period not satisfied
NOTE: The equilibration period does not begin until the instrument meets all
criteria for a Ready status. Therefore the Ready status (green) will not appear
until a preset time after the initial achievement of the Ready requirements. The
equilibration period for Flow is five minutes. This means that when a flow set-
ting is changed, once it stabilizes at the new setpoint (that is, once it stays within the
Flow tolerance limit), the flow equilibration period timer will start the five minute
countdown sequence leading to a green Ready status. The equilibrium period
for temperature is one hour. When an oven temperature set point is changed,
the one hour timer does not initiate the countdown until the chamber is within
the temperature tolerance limits. This time allows for down stream stabilization
and equilibrium to occur at the new concentration.
Permeation device display and selector
This is an interactive status box that displays the name of one of the loaded
calibrant tubes. To select another active tube, touch inside the white text field
to open a pull-down menu of the available tubes, and touch one to select it. The
text field will update with the new permeation tube name or chemical symbols,
and the concentration will update to show that tube’s current output level.
Concentration
This field displays the real-time calculation of the concentration of the permeant
displayed in the permeation device display. This value will update several times
per minute.
Mode
This shows the current operation mode—Manual or Auto.
Historical Display Graph
The Dynacal 235 logs up to seven days of historical data, with flow, concentra-
tion, and temperature continuously logged at one minute intervals. All critical
setpoints and calculations for all installed permeation devices are captured.
Selecting the “graph” tab presents the user interface for looking at all logged
data for the past week.
(Figure 12) Resolution down to individual point values
can be reviewed and presented in the following categories.
Conc
Selecting the Conc button will display the concentration record for the active
permeation device. The initial view is 10 hours, but by selecting the 24 hour
button on the lower left hand corner of the graph, you can see 24 hours of
data. Touching it again will display 7 days of historical data for concentration.
To review the concentration values for other installed permeation devices,
touch inside the Permeation device field in the Quick glance Status Bar and
Basic Operation