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- Monitor and control of either hotplate temp and solution temp (using a |
plug-in TC - most do this) |
- Active comparison between hotplate temp and solution temp (built into |
the recipe - ensures solution doesn't evaporate off, for example) |
- Automatic shut down feature (if solution temp changes suddenly when a |
beaker breaks, for example) |
- Interlock control on the low voltage side |
- Manual reset switch - when the hot plate shuts down (if a beaker |
breaks for example - human intervention is required to reset and get |
going again) |
- Manual reset switch - on a process timer (our plates on timers so |
shutoff after two hours, unless the operator resets the timer) |
So, if anyone is interested in an updated hot plate for general lab use, |
your feedback would be much appreciated. Please get in touch with us |
and let us know your level of interest ("I want a dozen" or "here's our |
alternative solution") |
Thanks, |
Mary & Jim at SNF |
-- |
Mary X. Tang, Ph.D. |
Stanford Nanofabrication Facility |
CIS Room 136, Mail Code 4070 |
Stanford, CA 94305 |
(650)723-9980 |
mtang at stanford.edu |
http://snf.stanford.edu |
From dan at engr.wisc.edu Fri Mar 27 11:24:21 2009 |
From: dan at engr.wisc.edu (Daniel Christensen) |
Date: Fri, 27 Mar 2009 09:24:21 -0600 |
Subject: [labnetwork] A safer hotplate? |
In-Reply-To: <49CBED29.70909@stanford.edu> |
References: <49CBED29.70909@stanford.edu> |
Message-ID: <7.0.1.0.2.20090327091841.02b6b1c0@engr.wisc.edu> |
Mary, |
Just a couple of quick thoughts...... |
You might add a secondary over-temp TC and over-temp |
controller. Most heated baths have this and it would be nice to |
prevent run away temps on the hotplate. |
We've also wondered about making some kind of "egg timer" on the |
hotplate that would require the user to punch a button every "X" |
minutes to keep the power on. This would provide hardware |
enforcement of the user's presence to monitor the hotplate. |
At 03:01 PM 3/26/2009, Mary Tang wrote: |
>Hello Labnetworkers -- |
> |
>We are interested in trying to find, or even build, a safer hotplate. |
>As you probably know, these things are ubiquitous and probably the most |
>hazardous thing in the lab. There was a presentation from a major |
>insurance company a while ago which said that the greatest damage |
>payouts in the semiconductor industry were due to fires caused by hot |
>pots or heating plates -- scarier still was that majority of these |
>incidents occurred during operation while someone was ostensibly present. |
> |
>Anyway, we (actually, Jim Haydon, one of our engineers) have been on the |
>search for a safer hotplate -- but just haven't found one that has all |
>the features we'd like. (Does anyone have recommendations???) Because |
>we haven't had a lot of success, Jim has initiated some discussions with |
>one of the best controlled hot plate manufacturers we've found. They |
>are interested in working with us, but wanted to see if there might be a |
>broader market (other than just our lab) for these things. So, this |
>email to you. |
> |
>Some of the features we'd like to see: |
>- Ability to program recipes and store multiple recipes (for example, |
>hot phosphoric nitride strip versus solvent-based resist strip). |
>- Programmable max temp (right now, we install a hard stop -- but it |
>would be nice to be able to change this depending on the process |
>need/recipe.) |
>- Monitor and control of either hotplate temp and solution temp (using a |
>plug-in TC - most do this) |
>- Active comparison between hotplate temp and solution temp (built into |
>the recipe - ensures solution doesn't evaporate off, for example) |
>- Automatic shut down feature (if solution temp changes suddenly when a |
>beaker breaks, for example) |
>- Interlock control on the low voltage side |
>- Manual reset switch - when the hot plate shuts down (if a beaker |
>breaks for example - human intervention is required to reset and get |
>going again) |
>- Manual reset switch - on a process timer (our plates on timers so |
>shutoff after two hours, unless the operator resets the timer) |
> |
> |
>So, if anyone is interested in an updated hot plate for general lab use, |
>your feedback would be much appreciated. Please get in touch with us |
>and let us know your level of interest ("I want a dozen" or "here's our |
>alternative solution") |
> |
>Thanks, |
> |
>Mary & Jim at SNF |
> |
> |
>-- |
>Mary X. Tang, Ph.D. |
>Stanford Nanofabrication Facility |
>CIS Room 136, Mail Code 4070 |
>Stanford, CA 94305 |
>(650)723-9980 |
>mtang at stanford.edu |
>http://snf.stanford.edu |
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