INFICON 2020ppbPRO Portable Photoionization Detector - Manual (Page 51)

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Figure 11. Interval Mode Display
Tube Life Time Display
Also, when the instrument is turned on the Tube Life Time status will be displayed in
the lower right portion of the display screen. If the time status is greater than zero,
the instrument is ready for use. If the time status is equal to zero, a prompt will be
displayed requesting the user to replace the expired sample intake conditioner tube
with a fresh tube (F1760162) and select the operating range for the instrument (e.g.,
High, Medium, or Low depending on ambient humidity).
NOTE: Following the selection of the operating range, the instrument will monitor the
amount of time the instrument has been in use and will prompt the user to replace
the tube when the time limit has been reached..
Numeric Value, Duration, Time and Date Entry
In cases where the system requires the user to enter a number, duration, time, or
date, the following mechanism is used. The number of digits to be entered depends
on the type of value being entered. Upon entering a value entry screen, a bar icon
below the left most digit highlights it as the active digit. The up (middle soft button)
and down (left soft button) arrows are used to increase/ decrease the digit. The bar
icon is moved to the next digit to the right using the right soft button. Once the user
has finished entering the value they use the right soft button to move the bar icon to
the far right to highlight the check mark. When the bar is under the check mark, the
left soft button chang
es to ‘done’. The user is then able to input the value. Pressing
the right soft button while the check mark is highlighted will return the bar icon to the
left most digit.
In some cases, units may be specified (e.g., ppm or hh:mm); in others there may be
no units.
No cancel option is available to the user. A value must be input.