User's Guide

Chapter 3. Using Your APS3
3.7
Setting the Purge and Measurement Times
When you click START, the APS device measures particles for the specified measurement time,
or until you click STOP. Prior to beginning the measurement, to purge the particle sensor, the
APS wafer runs its fan for a period of time without measuring particles. You can specify the
times for both purging and measurement. Typically a purge time of 60 seconds clears the APS
device of residual particles prior to starting a new measurement.
Figure 3.4: Setting the Purge and Measurement Times
To set the purge time:
• Under Settings > Measurement Options, use the Purge for controls to choose the
time and the units (seconds or minutes).
To set the measurement time:
• Under Settings > Measurement Options, use the Measure for controls to choose the
time and the units (seconds, minutes, or hours).
Purge time
Measurement
time
Settings
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