Hi Han,
I saw your message about the water leak detection question. Here at NSLS-II, we are using products from Raychem Tracetek to tie the alarm status of the leak detection alarm module as a digital input signal to Allen Bradley PLC equipment protection system. You
can check out the list of their products here:
https://www.nvent.com/en-us/raychem/solutions/commercial/applications/leak-detection
I would recommend using the TTSIM-1A-24VDC for the alarm module, which can hook up to 150m of TT1000 (water only) or TT3000(conductive liquid) leak detection sensing cable.
If you need more feedback, recs, or info on the water leak detection, contact me at
cguerrero at bnl.gov.
Best,
Chris Guerrero