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We have <a title="https://www.adafruit.com/product/4632" href="https://www.adafruit.com/product/4632">
very cheap particle sensors</a> to monitor unusual high particle values via NEMO. They are good enough at detecting malfunctioning ACH or deteriorated filters at a fraction of the cost of other particle monitors. I wouldn't use them to know if the spaces meet
certification or to know actual particle counts, but they are good to detect anomalies quickly.</div>
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Regards,</div>
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Sergi</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> labnetwork <labnetwork-bounces@mtl.mit.edu> on behalf of Nicholas Menounos <menounos@mit.edu><br>
<b>Sent:</b> Tuesday, March 24, 2026 5:50 PM<br>
<b>To:</b> Carroll, David <carroldl@wfu.edu>; Nathan Aultman <naultman@creol.ucf.edu><br>
<b>Cc:</b> Network Fab <labnetwork@mtl.mit.edu><br>
<b>Subject:</b> Re: [labnetwork] Cleanroom Particle Monitors</font>
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<p class="x_MsoNormal"><a name="x_x__MailAutoSig"><span style="font-size:11.0pt">With all the positive experiences, I am starting to feel some FOMO.</span></a></p>
<p class="x_MsoNormal"><span style=""><span style="font-size:11.0pt"> </span></span></p>
<p class="x_MsoNormal"><span style=""><span style="font-size:11.0pt">At nano we have not found them to be particularly useful and a maintenance headache (we have 2 per bay, ~30 total, one is always broken). Moving them during tool installs is a chore (vac tubing/new
cables runs/fussy connectors) and the vac pumps consume non-trivial energy.</span></span></p>
<p class="x_MsoNormal"><span style=""><span style="font-size:11.0pt"> </span></span></p>
<p class="x_MsoNormal"><span style=""><span style="font-size:11.0pt">We use the MET One 6015 (0.5 micron). In our Class 100/ISO5 laminar flow areas, they very rarely read above zero unless we lose space pressurization, which is already caught by our DP sensors
anyway. Because the capture window against the wall and below the HEPA is quite small, they just don't pick up much, though we do occasionally get readings in the Class 10k/ISO7 spaces.</span></span></p>
<p class="x_MsoNormal"><span style=""><span style="font-size:11.0pt"> </span></span></p>
<p class="x_MsoNormal"><span style=""><span style="font-size:11.0pt">Our original Basis of Design called for particle-counter-driven ACH, but we quickly replaced that with occupancy sensors. They are highly reliable at detecting the actual source of particles
(people), act proactively, and have a much wider field of view.</span></span></p>
<p class="x_MsoNormal"><span style=""><span style="font-size:11.0pt"> </span></span></p>
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<p class="x_MsoNormal" style="background:white"><span style=""><b><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:black">Nick Menounos, </span></b></span><span style=""></span><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:black">PE</span></p>
<p class="x_MsoNormal" style="background:white"><span style="font-size:9.0pt; font-family:"Arial",sans-serif; color:black">MIT.nano - Associate Director of Infrastructure</span></p>
<p class="x_MsoNormal" style="background:white"><span style="font-size:9.0pt; font-family:"Arial",sans-serif; color:black">Cell: </span><span style="color:black"><a href="tel:+15089320938"><span style="font-size:9.0pt; font-family:"Arial",sans-serif">(508)
932-0938</span></a></span></p>
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<p class="x_MsoNormal"><span style="font-family:"Calibri",sans-serif"> </span><span style="font-size:11.0pt"></span></p>
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<p class="x_MsoNormal"><b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> labnetwork <labnetwork-bounces@mtl.mit.edu>
<b>On Behalf Of </b>Carroll, David<br>
<b>Sent:</b> Tuesday, March 24, 2026 12:13 PM<br>
<b>To:</b> Nathan Aultman <naultman@creol.ucf.edu><br>
<b>Cc:</b> Network Fab <labnetwork@mtl.mit.edu><br>
<b>Subject:</b> Re: [labnetwork] Cleanroom Particle Monitors</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Georgia",serif">Hi Dr. Dixon,</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Georgia",serif">We too use the MetOne GT system and it has been a excellent device for us.</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Georgia",serif">Dave</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Georgia",serif">Wake Forest University</span></p>
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<p class="x_MsoNormal">On Tue, Mar 24, 2026 at 12:09<span style="font-family:"Arial",sans-serif"> </span>PM Nathan Aultman <<a href="mailto:naultman@creol.ucf.edu">naultman@creol.ucf.edu</a>> wrote:</p>
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<p class="x_MsoNormal" style=""><span style="font-size:11.0pt">Dr. Dixon,</span></p>
<p class="x_MsoNormal" style=""><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal" style=""><span style="font-size:11.0pt">We use a MetOne GT-321. It is one of their older models.
</span><a href="https://metone.com/product-categories/controlled-environments-clean-rooms/" originalsrc="https://metone.com/product-categories/controlled-environments-clean-rooms/" target="_blank"><span style="font-size:11.0pt">https://metone.com/product-categories/controlled-environments-clean-rooms/</span></a></p>
<p class="x_MsoNormal" style=""><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Times New Roman",serif">Nathan C. Aultman</span></p>
<p class="x_MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Times New Roman",serif">University of Central Florida</span></p>
<p class="x_MsoNormal" style=""><span style="font-size:11.0pt; font-family:"Times New Roman",serif">407-823-6852</span></p>
<p class="x_MsoNormal" style=""><a href="mailto:naultman@creol.ucf.edu" target="_blank"><span style="font-size:11.0pt; font-family:"Times New Roman",serif; color:#0563C1">naultman@creol.ucf.edu</span></a></p>
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<p class="x_MsoNormal" style=""><span style="font-size:11.0pt"> </span></p>
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<p class="x_MsoNormal" style=""><b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> labnetwork <</span><a href="mailto:labnetwork-bounces@mtl.mit.edu" target="_blank"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">labnetwork-bounces@mtl.mit.edu</span></a><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">>
<b>On Behalf Of </b>Alex Dixon<br>
<b>Sent:</b> Monday, March 23, 2026 4:22 PM<br>
<b>To:</b> Network Fab <</span><a href="mailto:labnetwork@mtl.mit.edu" target="_blank"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">labnetwork@mtl.mit.edu</span></a><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">><br>
<b>Subject:</b> [labnetwork] Cleanroom Particle Monitors</span></p>
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<p class="x_MsoNormal" style=""><span style="color:black">Hi Everyone, I was wondering what people use for particle measurement systems in their cleanrooms? We are trying to add active particle monitoring to our cleanroom facilities. I was looking at the lasair
pro from "Particle Measuring Systems" </span><a href="https://www.pmeasuring.com/" originalsrc="https://www.pmeasuring.com/" target="_blank">https://www.pmeasuring.com/</a><span style="color:black"> but university procurement is asking me to put together some
other options. </span></p>
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<p class="x_MsoNormal" style=""><span style="color:black"> </span></p>
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<p class="x_MsoNormal" style=""><span style="color:black">-Alex</span></p>
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<p class="x_MsoNormal" style=""><span style="font-size:10.5pt; font-family:"Segoe UI",sans-serif; color:#212121; background:white">__________________________________________________________</span></p>
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<p class="x_MsoNormal" style=""><span style="font-size:10.5pt; font-family:"Segoe UI",sans-serif; color:#212121"> </span></p>
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<p class="x_MsoNormal" style=""><span style="font-size:10.5pt; font-family:"Segoe UI",sans-serif; color:#212121; background:white">Alex Dixon, Ph.D. (He/Him)</span></p>
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<p class="x_MsoNormal" style="background:white"><span style="font-size:10.5pt; font-family:"Segoe UI",sans-serif; color:#212121">Lab Manager</span></p>
<p class="x_MsoNormal" style="background:white"><span style="font-size:10.5pt; font-family:"Segoe UI",sans-serif; color:#212121">Nanofabrication and Thin Film Deposition</span></p>
<p class="x_MsoNormal" style="background:white"><span style="font-size:10.5pt; font-family:"Segoe UI",sans-serif; color:#212121; background:white">Shared Instrument Facility </span></p>
<p class="x_MsoNormal" style="background:white"><span style="font-size:10.5pt; font-family:"Segoe UI",sans-serif; color:#212121">Colorado School of Mines</span></p>
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<p class="x_MsoNormal">_______________________________________________<br>
labnetwork mailing list<br>
<a href="mailto:labnetwork@mtl.mit.edu" target="_blank">labnetwork@mtl.mit.edu</a><br>
<a href="https://mtl.mit.edu/mailman/listinfo.cgi/labnetwork" originalsrc="https://mtl.mit.edu/mailman/listinfo.cgi/labnetwork" target="_blank">https://mtl.mit.edu/mailman/listinfo.cgi/labnetwork</a></p>
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<p class="x_MsoNormal"><b><span style="font-size:14.5pt; font-family:"Garamond",serif"><img border="0" width="201" height="80" id="x__x0000_i1026" style="width:2.0972in; height:.8333in" src="https://ci3.googleusercontent.com/mail-sig/AIorK4waCuLiotTjsm78s5FfIEsmwYz7oR0pEuZ9zn1MLBu95Uy3kjsyJ9O0HL1LbKPw0V7KdqpEpSOgNr7Q"></span></b></p>
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<p class="x_MsoNormal"><b><span style="font-size:14.5pt; font-family:"Garamond",serif">David L. Carroll PhD.</span></b></p>
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<p class="x_MsoNormal"><b><span style="font-family:"Garamond",serif; color:black; background:white">Nano and Quantum Technologies Laboratory</span></b></p>
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<p class="x_MsoNormal"><span style="font-family:"Garamond",serif; color:black; background:white">Wake Forest University</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Garamond",serif; color:black; background:white">95 W 32nd Street | Winston-Salem NC 27105 U.S.A.</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Garamond",serif; color:#1F497D">Web. </span><a href="http://www.wfu.edu/~carroldl" originalsrc="http://www.wfu.edu/~carroldl" target="_blank"><span style="font-family:"Garamond",serif">www.d</span></a><a href="http://www.david-carroll.org/" originalsrc="http://www.david-carroll.org/" target="_blank"><span style="font-family:"Garamond",serif">avid-carroll.org</span></a></p>
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<p class="x_MsoNormal"><span style="font-family:"Garamond",serif">Web. </span><a href="http://www.wake-nanotech.org/" originalsrc="http://www.wake-nanotech.org/" target="_blank"><span style="font-family:"Garamond",serif">www.wake-nanotech.org</span></a></p>
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<p align="center" style="margin-top:0in; text-align:center; margin-bottom:1rem"><span style="font-size:10.5pt; font-family:"Segoe UI",sans-serif; color:#131313"><img border="0" width="96" height="90" id="x__x0000_i1025" style="width:1.0in; height:.9375in" src="https://ci3.googleusercontent.com/mail-sig/AIorK4z4mqjdq5pfNYoHKKCsumtpAKnourN52vONGmx3KRmT3sbiPtaskOPIVOUev622dsuxBLeuZJ5Uvn0I"></span><span style="font-size:10.5pt; font-family:"Segoe UI",sans-serif; color:#131313"></span></p>
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