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Village Idiot
We used a MARK Products sniffers. I remember the techs leaving them on my workbench to change the filters and charge the batteries. At the time, I think they ran around 8K a pop…just looked on theeBay….Ah yes… good ole helium leak detection. Something I’m also very familiar with. I did quite a bit looking for vacuum leaks in our cryogenic transport trailers. Pull vacuum on the tank. Hook up the old Varian 959 leak detector. Spray suspected leak area with helium. Wait for the machine to display pretty red lights and sound it’s air raid siren. While you waited, fill plastic bags with helium and let them float up and collect on the shop ceiling. If you found your leak, break the vacuum on the tank, weld her up, and then do it all over again the next day. First thing to do the next morning though, was clean up the 20 to 30 plastic baggies that are now on the floor. Good times.
$125, LOL.
We also used equipment that cost in excess of 100K per rig, filled a box truck, and sometimes took 36 hours to complete. Those same functions can now be done in a couple of minutes with an Arduino, a few sensors, and some cheap coding.