Micro-Ion ATM gauges on eBay

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Dan Knapp
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Real name: Dan Knapp

Micro-Ion ATM gauges on eBay

Post by Dan Knapp » Wed Mar 13, 2019 2:53 pm

I just bought a Granville-Phillips (now MKS Instruments) Micro-Ion ATM gauge on eBay at a very good price, and the seller has four more available (https://www.ebay.com/itm/163551703123). Be aware that from the photos, at least one of these has heavy burn contamination on the inside of the flange. If you can get a clean one, it is quite a deal as these normally cost $1800. I have been using another one of these for several years and am very happy with it. I combines a diaphragm gauge, a heat loss gauge, and a (dual) hot filament gauge to span from atmosphere to 10-9 Torr. The sensor head is replaceable on these, but doing so is pricey ($800) unless you can find a replacement on eBay. You should be aware that the model for sale (390515-2-YG-T) is a custom version with the gauge enable control reversed from the standard described in the manual. You have to connect pin 3 to pin 5 to turn these on. Without knowing this, you would likely conclude that you've received a nonworking gauge and return it. There are other less important changes I could share with you if you buy one; PM me. I haven't actually received mine yet (I'll update this if indicated), but thought I'll share this with the group before they are gone.

Chris Giles
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Re: Micro-Ion ATM gauges on eBay

Post by Chris Giles » Wed Mar 13, 2019 9:29 pm

There is also a Series 354 available in US eBay cheaper. However, this covers only the high vacuum range so needs to be combined with another gauge. I got one of these but haven't got my high vacuum section running yet so haven't tried it out. Mine is RS-485 only..

Jerry Biehler
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Re: Micro-Ion ATM gauges on eBay

Post by Jerry Biehler » Thu Mar 14, 2019 1:01 am

Chris, those are DeviceNet. Good luck talking to them.

ian_krase
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Re: Micro-Ion ATM gauges on eBay

Post by ian_krase » Thu Mar 14, 2019 6:53 am

Yeah, I made the very bad mistake of buying a Devicenet pirani gauge.

It has a display, so not totally useless, but unlike most of the other industrial fieldbuses, Devicenet is extremely difficult to connect to anything.

Chris Giles
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Re: Micro-Ion ATM gauges on eBay

Post by Chris Giles » Thu Mar 14, 2019 10:12 pm

Jerry Biehler wrote:
Thu Mar 14, 2019 1:01 am
Chris, those are DeviceNet. Good luck talking to them.
Good point. The one I have is RS-485, for which I have a USB adaptor. I have no experience with DeviceNet.

Dan Knapp
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Real name: Dan Knapp

Re: Micro-Ion ATM gauges on eBay

Post by Dan Knapp » Tue Mar 19, 2019 10:51 pm

I received the Micro Ion ATM gauge today. It was too good to be true. They were listed as "Used," which, by eBay definition means fully functional, but it had an open filament. I told the guy I would try another one of his batch, but I suspect he got a batch of burned out gauges. Sorry for the false alarm on a good deal.

Jim Stead
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Re: Micro-Ion ATM gauges on eBay

Post by Jim Stead » Tue Mar 19, 2019 11:44 pm

Sorry to hear that. I bought one of these gauges too, and expect to get it on the 25th. I'll let you know what I end up with.

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