[labnetwork] VESDA Testing in Cleanrooms

[Morrison, Richard H., Jr]

Hi,

When we do that kind of testing at Draper we use DI water vapor very clean and no chance of contamination. I purchased my system from a company called

Applied Physics, Inc.
Bill To: PO Box 549, Niwot, CO 80544 USA
Ship To: 3800 Pike Road, Unit 16-204, Longmont, CO 80503  USA
www.AppliedPhysicsUSA.com<http://www.appliedphysicsusa.com/>
Tel: 303-651-0395


It is very effective and easy to use. Data sheet is attached

Rick


Richard Morrison
PMTS
Draper Laboratory
555 Technology Square
Cambridge Ma  02139
Office: 617-258-3420
Cell: 508-930-3461


From: labnetwork-bounces at mtl.mit.edu <labnetwork-bounces at mtl.mit.edu> On Behalf Of Matthew Moneck
Sent: Monday, March 8, 2021 5:16 PM
To: labnetwork at mtl.mit.edu
Subject: [labnetwork] VESDA Testing in Cleanrooms

Hi All,

I was hoping this community might be able to provide some insights on testing of VESDA systems in cleanrooms.  In particular, I am interested in how those of you with VESDA units handle the "smoke" test.  It is my understanding that "smoke" testing typically involves the spraying of an aerosol containing hydrocarbons, such as propane, butane, ethanol, etc. at the end of the detector piping or through a test port.  If your test ports are located within the confines of the clean space, how do you handle this aspect of the testing?  Do you allow the use of these hydrocarbon based materials, or is there an acceptable alternative?

In our particular case, the VESDA units are mounted at the intake to our recirculating air handlers, so there is concern that any overspray not pulled into the VESDA piping would end up going into the recirc unit.  Given the limited frequency of the testing, the limited quantity of spray required, and the amount of air flow in the lab, perhaps we are overthinking this and dilution is the solution.  Any feedback would be much appreciated.

Best Regards,

Matt

--
Matthew T. Moneck, Ph.D
Executive Manager, Claire & John Bertucci Nanotechnology Laboratory
Electrical & Computer Engineering | Carnegie Mellon University
5000 Forbes Avenue, Pittsburgh, PA 15213-3890
Phone:  412-268-5430
ece.cmu.edu<http://www.ece.cmu.edu>
nanofab.ece.cmu.edu<http://www.nanofab.ece.cmu.edu>

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