Measurement Preparation; Indoor Air Quality (Iaq) Considerations; System Settings And Test Setup; Zero Count Filter - Extech Instruments VPC260 User Manual

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Operation

4.3 Measurement Preparation

4.3.1 Indoor Air Quality (IAQ) Considerations

Particle pollution is a mixture of various components including smoke, dust,
chemicals, mold, and gases.
Evaluating IAQ by determining the concentration and size of these particles
can help to determine if a problem exists. Locating the source of these par-
ticles can help to determine effective methods of reducing these and improv-
ing IAQ.
Air temperature, relative humidity, and CO levels are also important consider-
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ations for IAQ, as high humidity and lower temperatures can bring about mold
creation.

4.3.2 System Settings and Test Setup

Before testing, configure the System settings and Test settings. The System
settings menu offers global options such as date/time, language, and LCD
brightness. The Test settings menu allows you to set the test length, number
of tests to run consecutively, interval between tests, test modes, and more.
See Section 5, Test Settings Menu, and Section 6, System Settings Menu, for
complete instructions.
Press F2 from the opening screen to open the System settings menu. Press
F2 from the measurement screen to open the Test settings menu.

4.3.3 Zero Count Filter

Particles must be purged before and after each use, especially in a high par-
ticle count environment. To start, unscrew and remove the Isokinetic particle
count probe and attach the supplied zero count filter. Switch the meter on,
and follow the steps below for the Test Settings Menu items (Section 5).
1. Set the Sample Mode to Cumulative.
2. Select all available channels in the Channel Display menu.
3. Set the Sample Time to 60 seconds.
4. Set the Sample Cycle to 10 test cycles.
Now, press RUN to start the test. When the test cycles have completed check
that all channels read zero particles. You may need to run the test cycles sev-
eral times to ensure that all channels are purged.
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