[labnetwork] wet bench EMO's

[Prashant Srinivasan]

Kyle,

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).

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: 
https://www.bapihvac.com/product/water-leak-detector-with-attached-or-remote-sensor/ 
(or) https://www.ato.com/water-leak-sensor-transmitter

I'd say a monthly visual inspection and replacing lines on the verge of 
failing should suffice.

Prashant

On 4/7/2026 9:13 AM, Kyle Keenan wrote:
> Hello All,
>
> 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.
>
> I look forward to reading your replies.
>
> Best,
> -- 
> Kyle Keenan
>
> Senior Manager - Laboratory Operations
> Quattrone Nanofabrication Facility
> University of Pennsylvania
> P: 215-898-7560
> F: 215-573-4925
>
>
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-- 
Prashant Srinivasan,
Teaching Cleanroom Engineer
Electrical & Computer Engineering
University of California, Santa Barbara
Santa Barbara, California 93106
https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr
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