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<p>Kyle,</p>
<p>The EMO on our benches (Ancient Pure Aire) shuts off the 208V and
120 V circuits (fluorescent lamps, Ph meter, outlets and the
laminar flow motor). The DI/CDA/N2 systems are passive (no
electrical actuation). </p>
<p>If you want to go the automated route, a DIY approach is an OpAmp
comparator (with suitable level shifters). COTS solutions are
aplenty, something like this:
<a class="moz-txt-link-freetext" href="https://www.bapihvac.com/product/water-leak-detector-with-attached-or-remote-sensor/">https://www.bapihvac.com/product/water-leak-detector-with-attached-or-remote-sensor/</a>
(or) <a class="moz-txt-link-freetext" href="https://www.ato.com/water-leak-sensor-transmitter">https://www.ato.com/water-leak-sensor-transmitter</a></p>
<p>I'd say a monthly visual inspection and replacing lines on the
verge of failing should suffice.</p>
<p>Prashant </p>
<div class="moz-cite-prefix">On 4/7/2026 9:13 AM, Kyle Keenan wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAGTqYdG4DFHmSjFJYXTML69bidMbZWNz7bgNvbUQ5QyUyiZwYg@mail.gmail.com">
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<div>Hello All,</div>
<div><br>
</div>
<div>I'm curious to know what the EMO's do on the wet benches in
your facilities. Do they shut down CDA, N2 or water, or just
high voltage? What is the thought process behind what
does/does not get shut down? We recently had a bad DI water
leak on one of our benches, and we were a little surprised to
find out that the EMO did not shut off the water supply, so we
are considering whether or not we want to make a changes to
the way the EMO's work on our benches. </div>
<div><br>
</div>
<div>I look forward to reading your replies.</div>
<div><br>
</div>
<div>Best,</div>
<span class="gmail_signature_prefix">-- </span><br>
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data-smartmail="gmail_signature">
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<div>Kyle Keenan</div>
<div><br>
</div>
<div>Senior Manager - Laboratory Operations<br>
</div>
<div>Quattrone Nanofabrication Facility</div>
<div>University of Pennsylvania</div>
<div>P: 215-898-7560</div>
<div>F: 215-573-4925</div>
<div><br>
</div>
<div><img
src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXe66pb_bj7n0vXky5r9uEf3y5sMz4yFV2HK-lOuGGMzj3VS6ybtG41AGZcUidgjZH61GUaGnR38EWIiqL3J-TsS9TxolLE--_h8K79Lk-dgYMHSjcBvHUy-zL7bWnKmfmJklE7i?key=OpK1PovMbdplDTzml6yQgugX"
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<pre class="moz-signature" cols="72">--
Prashant Srinivasan,
Teaching Cleanroom Engineer
Electrical & Computer Engineering
University of California, Santa Barbara
Santa Barbara, California 93106
<a class="moz-txt-link-freetext" href="https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr">https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr</a></pre>
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