Page 3-6 Lasair II Particle Counter Operations Manual
Chapter 3: Controls and Displays
NOTE:
The display is real time; it shows changing particle counts as
a sample is run. While sampling, real-time values of the following
parameters are displayed:
• Sampling time or delay time
• Flow rate
Many areas of the screen change during operation to reflect real-time status. These
changes are discussed in the sections that follow.
• Sampling Data Area: When the particle counter is first turned on, no particle
counts are shown. Once you start sampling, the particle counts are displayed.
When the sampling has completed, the final counts for that sample are shown on
the main display screen. These results will remain until the next sampling is
performed. At that time, the columns will reset to zero in preparation for the next
set of data.
• Top Reporting Banner: When the Start key is pressed, the Initial Delay
countdown will begin. An hourglass will appear to the left of the pre-sampling
countdown time.
➢When the Initial Delay time reaches 0, sampling begins. The sample time
counts down to zero from the sample time you have set. A clock symbol is
displayed to the left of the sample time.
➢If the sample is by volume, a beaker will appear in the upper left part of the
Main Display Screen and the sample countdown will be by the volume
remaining.
➢When the sample is completed, a check mark (✓) will appear to the left of the
clock or the beaker, which is to the left of the sampling time (or volume). If
the sample run was invalid, the check mark will have a red “X” over it.
• Bottom Reporting Banner: In the bottom banner, the battery status is displayed
as a percentage of a full charge. When the battery is discharging (that is, the unit
is not plugged in to an electrical outlet), the number will be negative. If the
battery is charging, the number will be positive. This information is real time.
CAUTION
If the particle counter stops because of low battery power, charge the
battery immediately. A Nickel-metal-hydride battery that remains uncharged
for several weeks will lose additional charge due to its chemistry. Allowing
the battery to fully discharge may damage it and cause it to be
unchargeable.
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