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Back in the day Bruce, Thermco, MRL and Persys all had multiple versions of the external torch hardware, and some were integrated well, and some were clunky.
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The original J hook actually had the flame active in the source zone and could create 10 degree shift in the temperature as the flame tickled the back of the tube. The external torch designs cut down the source zone delta t to a degree or less in process conditions.
Huge improvement. J hook had reliability issues with the flame and flow patterns, small flow changes effected the flame direction and quality.
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You need to maintain your flow ratio of H2 O2 to 1.88 or less, and most of the torches will allow you to wait 10 seconds to see the flame after gasses flow.
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The MRL and the Thermco style both use a reliable Honeywell uv sensor for flame sense, pretty reliable.
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MRL designs have a jacket around the torch to help manage heat. Persys use a lot of CDA to cool the torch, and Thermco design requires a scavenger to pull the excess heat out of the source cabinet. Thermco did make a water cooled unit that was pretty fancy,
and wasnt used often. <br>
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Bruce had its own design, and migrated to a version of the persys torch hardware with its 5600 model external torch control system
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Persys uses lamps technology to light the flame, and once the flame is set, the lamps turn off.
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If your furnace is profiled, it should be able to obtain 1% or 2 % process uniformity using the external torch designs.
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Expertech does have product knowledge across all of the versions, and can help guide you. Feel free to reach out directly and we can get you back on track. We do offer new, remanufactured, and subject to availability used working parts. I cant say we support
every torch perturbation from in 40 years but we are qualified historians and know the evolution.
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thanks<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> labnetwork <labnetwork-bounces@mtl.mit.edu> on behalf of Paolini, Steven <spaolini@cns.fas.harvard.edu><br>
<b>Sent:</b> 03 August 2021 14:00<br>
<b>To:</b> Scott Blondell <spb1699@rit.edu>; labnetwork@mtl.mit.edu <labnetwork@mtl.mit.edu><br>
<b>Subject:</b> Re: [labnetwork] Pyrogenic internal torch</font>
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Scott,</p>
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Over the years, I have had great results with MRL external torches. The main advantage is being able to see the combustion and whether or not the torch depth is correct. The other big advantage is being able to use a flame detector that will shut off the
H2 flow in a couple of seconds (adjustable) to avoid injecting gas continuously into a cold torch. You may be seeing uniformity issues with the coaxial if you have tiny air leaks being pulled into the tube from the ground glass joints. Are you using Teflon
seals? In any event, please ensure that you are running the H2/O2 mix Oxygen rich to prevent accumulating H2 downstream.</p>
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Equipment Dood</p>
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<span style="font-size:14.0pt">Steve Paolini</span></p>
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<span style="font-size:14.0pt">Principal Equipment Engineer</span></p>
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<span style="font-size:14.0pt">Harvard University Center for Nanoscale Systems</span></p>
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<span style="font-size:14.0pt">11 Oxford St.</span></p>
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<span style="font-size:14.0pt">Cambridge, MA 02138</span></p>
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<span style="font-size:14.0pt">617- 496- 9816</span></p>
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<span style="font-size:14.0pt">spaolini@cns.fas.harvard.edu</span></p>
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<span style="font-size:14.0pt">www.cns.fas.harvard.edu</span><span style="font-size:14.0pt"></span></p>
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<b>From:</b> labnetwork <labnetwork-bounces@mtl.mit.edu> <b>On Behalf Of </b>Scott Blondell<br>
<b>Sent:</b> Tuesday, August 03, 2021 3:50 PM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] Pyrogenic internal torch</p>
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Greetings Labnetters,</p>
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We’re in the process of tweaking our wet ox process. Hardware changes provided an opportunity to consider
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alternatives to our current internal “candy cane” torch arrangement employed in several tubes. Currently running 6” silicon</p>
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in 205/211mm quartz w/candy cane torch. This doesn’t give us the luxury of a simple visual inspection without pulling the tube.</p>
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A straight coaxial torch is being qualified now, and it’s presenting some challenges. Growth rates are lower than predicted and
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across boat uniform is >6%. </p>
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Polling the audience: what are your preferences – cane v straight?; straight torch design details/vendors?; gas flows?</p>
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There’s a lot of knobs to turn – at 2/runs per day it’s slow to fine tune.</p>
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We do have an MRL external torch that served us well for lower temp processes. Space and budget precludes using it in</p>
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multiple tubes.</p>
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Appreciate any feedback, tips or outright opinions.</p>
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Regards,</p>
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Scott P. Blondell</p>
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Fac. Mgr.</p>
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RIT SMFL</p>
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315.738.4073</p>
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<p>mark cooper</p>
<p>Expert Semiconductor Technology, Inc.</p>
<p>Phone: (831) 439-9300</p>
<p>Fax: (831) 439-8139</p>
<p>This email message is for the sole use of the addressee(s) and may contain Expertech confidential and legally privileged information. Access, review, use, disclosure or distribution of this email by anyone other than the intended addressee is unauthorized
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