On 09/21/2011 04:57 AM, David C. Partridge wrote: > Howsabout HFC-236fa - very similar properties to R114 but not banned.
>> Tektronix used a Freon in their 40 KV High Voltage probes. The Vapor >> pressure of some of those compounds is low at 70F, but they do have to >> be sealed. I use several of the Tek probes in my work (and of course am too cheap to buy the newer solid dielectric ones). When my freon ran out, I searched around for a replacement fluid and found ordinary butane straight from the Ronsonol can to be equal to or maybe even better than the original freon. About a decade ago I wrote up a procedure on how to do the fill without introducing condensate into the chamber. I posted it to Usenet. I think that it's archived at http://yarchive.net. John -- John DeArmond Tellico Plains, Occupied TN http://www.neon-john.com <-- email from here http://www.johndearmond.com <-- Best damned Blog on the net PGP key: wwwkeys.pgp.net: BCB68D77 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.