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Re: Gauges

Posted By: SVP Neon Equipment
Date: Saturday, 6 April 2013, at 9:40 p.m.

In Response To: Re: Gauges (bill's neon)

> kind of reminds me of grade school.... he he.

Thanks for your comments, Bill. I appreciate you expressing your feelings. I'll make a note of that.

BTW, how do you know the gauge is accurate? 95% of neon vacuum gauges that are more than 2-3 years old (sometimes less) are out of calibration for various reasons. When is the last time it was calibrated (a true calibration by someone who knows what they are doing)? Televac recommends once every year. How do you know the gauge tube isn't contaminated and giving a false reading? It's easy to check if you know how, but if you don't you are still just guessing. Someone can also "tweak" the calibration to show a lower reading than the actual pressure. Many neon shops do this unknowingly by "resetting" the needle zero set. In other words, if the gauge isn't showing what they want it to, or what they think it should, they adjust the needle set screw until it shows what they want it to. Doing that does NOT calibrate it, but rather gives the viewer a false reading. Your mention of "I borrowed a ol' Transco Televac 2 from a friend" indicates the latter may be the case. A mechanical pump alone rarely gets as low as 2 microns in the real world, whereas a system with a properly functioning diffusion pump will get substantially below that point. So a 2 microns reading is in the range of "It doesn't add up".

Best regards,

SVP Neon Equipment

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