dust measurement

TrinhTT,

There are many, many instruments that you can choose from...

A few questions to qualify your needs:

When you say you have a "clean room", how "Clean" is it?

What classification system do you follow (US FS209D/E, ISO 14644-1, BS 5295)?

Do you need to perform spot measurements (i.e., with a battery-powered, handheld device), or do you want a fixed (line-powered) instrument for continuous, remote monitoring?

A good starting point for you might be to check out the following link:

http://www.particlecounters.org/

They have information on, and review of many of the particle counters on the market...

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Just my $0.02...

thanks for your answer I didn't now of all this fact that I should check.

o.k. here the situation:

am searching for a instrument that would be fixed in a room that will a continuous reading and if the dust in the air it,s too high it will start a alarm.

alarm will be actved by a relay or a output digital signal.

The question <When you say you have a "clean room", how "Clean" is it?> requires a quantitative answer before proceeding.