On 29 November 2015 at 10:53, Charles Steinmetz <[email protected]> wrote:
Dave wrote: > > As regards humidity, I wonder if an reasonable attempt at sealing a package >> combined with silica gel inside would give an internal humidity that keeps >> fairly stable. >> > > That is exactly what I do. I typically package references in small, cast > aluminum boxes, and include as large a dessicant packet as will fit in the > unused space. Without any special precautions as to sealing, I have never > seen one of the dessicant packs more than slightly used, even after a > decade or more and even if there was a hole in the box wall to allow for a > potentiometer adjustment. With precautions (using a gasket or sealing the > seam with RTV after final testing, and sealing any adjustment holes), I > think you'd be good for a lifetime. > > Best regards, > > Charles Are you, or anyone else, aware of any reasons silica gel should not be used in electronic enclosures? A friend and I were thinking of developing antennas, which would be used outside, but enclosed in a fibreglass or similar tube. I suggested flushing the antenna with nitrogen, then putting silica gel inside. He was of the opinion that silica gel was not a good idea. Instead he reckoned on pressuring the inside with nitrogen above ambient pressure, and having gas-tight seals would be better. I'm personally of the opinion that's a bit over the top, as then you need valves to get the nitrogen in. His idea stuck me as a bit of a sledgehammer to crack a walnut, but he has better mechanical engineering skills than me. The difference with the antennas compared to a voltage standard is antennas would be used in a more hostile environment than a laboratory. So perhaps whats reasonable in a lab, is not so sensible for an antenna exposed to wind, rain, ice etc. Dave _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
