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Disk Absolute Filters-Clean? Rebuild?

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jjh

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Mar 20, 2011, 12:53:30 PM3/20/11
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I am interested in hearing peoples thoughts on the reuse/cleaning of
absolute filters on DEC disk drives.

I have RK05 and RL02 disk that I periodically clean the absolute
filters. I have not found a source of these new in the last 15 years.
I doubt there are any around, given the lack of demand. (if someone
can tell me different, please do).

Having cleaned the filters a number of times, I am wondering if there
is a way to rebuild them or clean them in a fairly thorough way?

I don't run the drives all that often ( perhaps a total of 30 days *
24 PHO), but at some point, the filters will become clogged to stress
the fan, and loose the filtering effectiveness.

Any suggestions how to effectively rebuild them or clean them is
appreciated.
I use a fairly strong vacuum to suck out the particulates, as opposed
to blowing them out from behind (i.e. reverse air flow), although on
occasion I do use reverse air flow at a low flow rate.
-J

Hans Vlems

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Mar 21, 2011, 4:16:40 AM3/21/11
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May I suggest as an alternative the filter material that is used in
kitchen equipment.
What I mean is the air filter equipment you find above stoves and
ovens, no idea what these
things are called in English. Anyway, the filter material is sold like
cloth, and there is a
choice in the way the filter material operates (thickness of the
material, average pore size,
air resistance etc).
Hans

jjh

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Mar 21, 2011, 10:20:33 AM3/21/11
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Thank you. I'll look into these but the pore size for kitchen
applications are for large granularity particulates. I have a source
of raw microfiber filter material but the nagging question is how much
of an impedance to the air flow is this material? and is it within the
bounds of the fan design?
I am hoping someone has walked down this road and has some experience.

I have toyed with the idea of putting a pitot tube in the flow channel
and an amp meter on the fan motor (could also measure speed depending
on the type of motor that is used). I would try a number of filters
that I have and get a slope of current-flow rate. I would have to
make sure my retrofit filter was below this curve.

The original filter mfg (or DEC) should have spec'ed out the filter
requirements, but I have not found any. The only thing I've found,
and it seems anecdotal, is 100um.

aaac...@aol.com

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Aug 26, 2012, 5:11:28 AM8/26/12
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you get new 99.99% dec filters at cpp inc. they have dec: RK03, RKO5,
RL01-RL02, RM02-RM03, RM05, RA60A and more. they have disk heads
cartridges pack motors & parts their email: berry...@live.com
in Alpine California. phone: 619 445 4629 Good Luck

dave5...@yahoo.co.uk

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Sep 29, 2012, 10:13:40 AM9/29/12
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Hi, Iv just aquired 3 RK05's and though as net Iv not changed the absolute filter this was one of my wories, now what I have done is to use a car air filter as the pre filter, the idea bieng that this will take out a lot more than the noramal prefilter and give the absolute let to do so extending its life.
I use one for a ford, EAF401, it has to be gaffer taped on but as my drives did not have any prefilter when I got them anyway im not to worried
Dave

JackRubin

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Nov 10, 2012, 12:44:41 PM11/10/12
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I found a cache of NOS RL01/2 absolute filters (equivalent to DEC p/n 1213097) at the Filter Factory in Santa Ynez, California (www.thefilterfactory.com),
phone 805.733.2180. They have 40 in stock. Price is $28.60 each, shipping for a single filter to 60091 was $8.27. I ordered one to verify dimensions and construction - perfect match for the original part. The filters were manufactured by HEPA Corporation (still in business) but minimum order quantity from HEPA is 100 units. Filter Factory will _not_ be ordering after the current stock is gone.

Get'em while you can!

Jack

Carl Claunch

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Mar 21, 2013, 6:11:53 PM3/21/13
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On Sunday, March 20, 2011 9:53:30 AM UTC-7, three_jeeps wrote:
...
> I have RK05 and RL02 disk that I periodically clean the absolute
> filters. I have not found a source of these new in the last 15 years.
> I doubt there are any around, given the lack of demand. (if someone
> can tell me different, please do).
>

Just bought one for an RK05 on ebay -- this vendor seems to have both heads and filters that are NOS. http://stores.ebay.com/ACPP?_trksid=p2047675.l2563
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