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Gregg:<br>
<br>
I agree with Dennis that Tom Britton of Critical Systems will be a
valuable resource ... they know Air Products cabinets forwards and
backwards.<br>
<br>
We have a handful of older Air Products GS500 cabinets. They are
equipped with MKS pressure transducers. I think that both Wika and
MKS (and others, I'm sure) have been producing pressure transducers
for uses like this for a long time.<br>
<br>
Pending more detailed information from Tom Britton, there are a few
things that you will need to try to match when looking for a
replacement transducer ... and all pressure transducer manufactures
including Wika, MKS, and others offer a dizzying array of part
numbers and options.<br>
<br>
The things that you will need to match include:<br>
<br>
1. Power supply voltage. Most commonly +24VDC.<br>
<br>
2. Output signal: 4-20 mA is probably most common, but some systems
use 0-5VDC or even 0-10VDC.<br>
<br>
3. Compound or "normal" gauge. In other words, does the gauge go
from 0 PSIA or 0 PSIG to maximum pressure reading. Many cabinets
that have vacuum generators will use compound gauges to be able to
measure down to 0 PSIA (-14.73 PSIG) ... but your gauge has to put
out what the controller is expecting.<br>
<br>
4. Electrical connector or "flying leads" to match what is already
in your cabinet.<br>
<br>
5. Flow through or single-ended.<br>
<br>
6. Weld joint or VCR.<br>
<br>
7. Particularly for your silane cabinets, do you need gauges that
are Class 1/Div 2 rated? That is, they can't induce an explosion in
the event of a leak.<br>
<br>
Also, some manufacturers offer a built-in readout if you want to be
able to see a pressure reading where you currently have an analog
gauge.<br>
<br>
If he doesn't chime in on his own, send me email and I'll give you
Tom Britton's contact information: he will likely be able to
short-circuit much of your search and provide you with lots of good,
specific information.<br>
<br>
Let me know if you have any further questions,<br>
<br>
John<br>
<br>
<div class="moz-cite-prefix">On 10/14/2014 2:54 AM, Dennis Schweiger
wrote:<br>
</div>
<blockquote
cite="mid:CAKzi2_MY-BTwQxN9yCt5oOUXcBbTJ0W2Kts-wPaMkv7Cw8gC4g@mail.gmail.com"
type="cite">
<div dir="ltr">Gregg,
<div><br>
</div>
<div>I'd talk to Tom Britton of Critical Systems. He's on this
site, and is a regular contributor. They have also
refurbished "older" Air Products gas cabinets for me. I would
expect them to have spares, or could at least point you in the
correct direction. The "Span" name has been bought and sold
so many times, I'm not sure what banner they're being offered
under now.</div>
<div><br>
</div>
<div>I took a look at one of our gas cabinets, we're using a
WIKA guage, similar to this;<br>
<br>
</div>
<div><a moz-do-not-send="true"
href="http://wika.us/PGT23_063UHP_en_us.WIKA">http://wika.us/PGT23_063UHP_en_us.WIKA</a><br>
</div>
<div><br>
</div>
<div>Take care,</div>
<div class="gmail_extra"><br clear="all">
<div>
<div>DennisSchweiger</div>
<div>University of Michigan/LNF</div>
<div> </div>
<div>734.647.2055 Ofc</div>
</div>
<div><br>
</div>
<div class="gmail_quote">On Mon, Oct 13, 2014 at 1:46 PM,
Gregg Cure <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:gregg.cure@gmail.com" target="_blank">gregg.cure@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hello,
<div>We have older (circa 1992) Air Products GasGuard
GG450 single and dual controller gas cabinets. </div>
<div>We are using them for SiH4, DCS, PH3 balance SiH4
for various LPCVD processes.</div>
<div><br>
</div>
<div>The Span pressure gauges in the pigtails and VMBs
are showing their age and a few of them have failed,
or are no longer able to be calibrated. These gauge
transducers are either in the own weldments connected
to the lines or connected to the lines via VCRs. One
gauge is an analog visual unit on the secondary side
of the regulator with an integral transducer that
sends a signal to the controller.</div>
<div><br>
</div>
<div>It seems that Span is no longer a viable entity.
Does anyone know of a 3rd party company that sources
replacements for these transducers?</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Gregg Cure`</div>
<div>
<div><br>
</div>
-- <br>
Gregg D. Cure`<br>
The University of Arizona<br>
Arizona Research Laboratories<br>
Nano Fabrication and Processing Center<br>
1230 E. Speedway Blvd.<br>
P.O. Box 210104<br>
Tucson, AZ 85721-0104<br>
Office: <a moz-do-not-send="true"
href="tel:520.626.1987" value="+15206261987"
target="_blank">520.626.1987</a><br>
Cell: <a moz-do-not-send="true"
href="tel:520.307.2760" value="+15203072760"
target="_blank">520.307.2760</a><br>
Fax: <a moz-do-not-send="true"
href="tel:520.626.7877" value="+15206267877"
target="_blank">520.626.7877</a><br>
Website: <a moz-do-not-send="true"
href="http://mfc.engr.arizona.edu" target="_blank">http://mfc.engr.arizona.edu</a><br>
Website: <a moz-do-not-send="true"
href="http://www.arl.arizona.edu/" target="_blank">http://www.arl.arizona.edu/</a>
</div>
</div>
<br>
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