Debugging an Inficon PKR 251 Series Gauge

Every fusor and fusion system seems to need a vacuum. This area is for detailed discussion of vacuum systems, materials, gauging, etc. related to fusor or fusion research.
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Duncan Wilkie
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Real name: Duncan Wilkie

Debugging an Inficon PKR 251 Series Gauge

Post by Duncan Wilkie » Sun Aug 19, 2018 7:27 pm

So I got this gauge (2000+ new) for like $200 on eBay and I've been having some issues with it. I attached it directly to the output of my diff pump and pulled a vacuum through it with my backing pump, and got like 15 torr. The pump was very loud, so I assumed it was my shoddy job of re-using a conflat gasket. I replaced the gasket, and when I pulled vacuum again the pump was whisper-quiet after I closed the ballast. However, the gauge still read 15 torr. This may be an internal issue with my gauge, but I was wondering if this auditory indicator is a valid way of determining vacuum quality.
Thanks,
-Duncan
Some say the glass is half full. Others see it as half empty. I say it is twice as big as it needs to be.

ian_krase
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Re: Debugging an Inficon PKR 251 Series Gauge

Post by ian_krase » Mon Aug 20, 2018 12:31 am

Rotary vane pumps definitely get quiet when the pressure and gas load are small, but it's not terribly sensitive.

Andrew Seltzman
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Re: Debugging an Inficon PKR 251 Series Gauge

Post by Andrew Seltzman » Mon Aug 20, 2018 11:59 am

Could be a problem with the pirani element, they are known to go bad on these gauges.
Andrew Seltzman
www.rtftechnologies.org

Jerry Biehler
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Re: Debugging an Inficon PKR 251 Series Gauge

Post by Jerry Biehler » Wed Aug 22, 2018 3:55 am

Send it back and get your money back, I usually dont spend more than $100 on these units.

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