[volt-nuts] Resistance standard

Tue Aug 23 16:39:13 UTC 2011

Hi,
I'd go for the 70 or 90 weight Clarion oil rather than the heavy stuff. The Vitamin E is less than 1%, probably trace, the spec says it is 100% oil. 

Robert G8RPI

--- On Tue, 23/8/11, m k <m1k3k1 at hotmail.com> wrote:

From: m k <m1k3k1 at hotmail.com>
Subject: Re: [volt-nuts] Resistance standard
To: volt-nuts at febo.com
Date: Tuesday, 23 August, 2011, 13:09

Hi,
Well I had a look at both those sites, this tells you about the oil:http://docs.clarionlubricants.com/msds_pi/C10107.pdfIt is certainly parraffinic in nature, as the high pressure hydrotreatment would get rid of any double bonds ( think ethylene etc )The vitamin e treatment may lower the conductivity a bit? but most likely not enough to be of concern.That page also leads me to think that the UK suppliers medic.15 is the same as the clarion 90. the 188 Centigrade flash point is plenty high enough for lab equipment usage. The medic.68/Clarion 350 would be quite syrupy and probably have too low a thermal conductivity as a consequence?

> Date: Tue, 23 Aug 2011 12:36:38 +0100
> From: robert8rpi at yahoo.co.uk
> To: volt-nuts at febo.com
> Subject: Re: [volt-nuts] Resistance standard
> 
> Hi,
> I found a US and a UK supplier
> Clarion 90 $88 5 Gal
> http://www.clarionlubricants.com/do/product/FOOD_GRADE/633507009
> UK
> EXOL  Medic 15 £96 25 litres
> http://www.lubetechshop.co.uk/index.php?cPath=25_49
>  
> The US suppler has more datasheets and a selection of viscosity grades available. 
> Another source that I think has been mentioned before is animal / vet suppliers.
>  
> Robert G8RPI.
> 
> --- On Tue, 23/8/11, Rob Klein <rob.klein at smalldesign.nl> wrote:
> 
> 
> From: Rob Klein <rob.klein at smalldesign.nl>
> Subject: Re: [volt-nuts] Resistance standard
> To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
> Date: Tuesday, 23 August, 2011, 9:47
> 
> 
> I have an L&N 10k oil-bath standard which is filled with something that 
> smells a lot like kerosene.
> 
> The stuff I am going to use is *not* a synthetic oil but, as I mentioned 
> earlier, a mineral oil. According to the manufacturer, it is made up of 
> "paraffinic and cyclo-paraffinic hydro-carbons"
> 
> http://www.kroon-oil.com/en/products/catalogue/seg_ind/krmp/200/industry/kroon-oil-maintenance-products/sewing-machine-oil/
> 
> 
> Rob.
> 
> Op 23-8-2011 8:33, Robert Atkinson schreef:
> > I investigated this and both NIST (NBS) and NPL use refined mineral oil A.K.A liquid paraffin for room  to medium temeperature baths. This is a food/pharmaceutical  grade oil. It is a clear white oil, pretty much non-toxic and no disposal concerns. The materials in older standards will have been intened for immersion in this, not modern synthetic oils. A commercial food or confectionery supply house should be able to supply larger quantities at resonable cost.
> >   
> > Robert G8RPI.
> >   
> > --- On Mon, 22/8/11, Mitch Van Ochten<mitch at vincentelectronics.com>  wrote:
> >
> >
> > From: Mitch Van Ochten<mitch at vincentelectronics.com>
> > Subject: Re: [volt-nuts] Resistance standard
> > To: "Discussion of precise voltage measurement"<volt-nuts at febo.com>
> > Date: Monday, 22 August, 2011, 23:50
> >
> >
> > Hi Rob,
> >
> > ESI recommended "Drakeol 9 LT mineral oil" in their literature which I couldn't find in small
> > quantities.  I investigated a synthetic oil replacement called SpectraSyn PAO and Exxon offered
> > to send a sample.  After checking with a chemist at work I decided not to.
> > He said over many years of immersion the "long chain parrafin" as Mike mentioned would be the best, and
> > less likely to deteriorate the insulation than the synthetic replacement.
> >
> > I have attached a chart he sent me for the group's observation.
> >
> > Mitch
> >
> >
> > ----- Original Message ----- From: "Rob Klein"<rob.klein at smalldesign.nl>
> > To: "Discussion of precise voltage measurement"<volt-nuts at febo.com>
> > Sent: Monday, August 22, 2011 8:10 AM
> > Subject: Re: [volt-nuts] Resistance standard
> >
> >
> >> Hi Mike and Charlie,
> >>
> >> For the oil, I have decided on the stuff that is sold locally as "sewing machine oil". This is a highly refined light mineral oil, guaranteed to be acid free.
> >>
> >> As explained in my previous message, things haven't been progressing over the last 18 months, but I'm going to pick it up again soon, so stay tuned.
> >>
> >>
> >> Best regards,
> >> Rob.
> >>
> >> Op 23-7-2011 19:14, Charles Black schreef:
> >>> Hi,
> >>>
> >>> The traditional oil for standard resistors and oil baths is Mineral Oil. The cheapest source of Mineral Oil USP  for small quantities is out local grocery store at about $5.50 per pint. It is a highly purified paraffin oil. If you need a large quantity then check out Exxon Marcol 72 which is available for about $12 per liter from Measurements International. I am trying to find a much better price since I could potentially use 157 liters if I am able to get a used bath that I know of.
> >>>
> >>> Charlie
> >>>
> >>> On 7/23/2011 3:03 AM, m k wrote:
> >>>> Hi,
> >>>>
> >>>> I only recently joined this group, but in answer to rob, the best oil would be a long chain parrafin, can be purchased for vacuum pumps, also a solid encapsulation will shift as it ages, and that would put strain on the resistors, so they would need an initial wrap in a silicone perhaps? definately a very compliant cover of some sort to isolate the strain.
> >>>>
> >>>> Mike
> >>>>
> >>>> PS I am shortly going to set up some LTZ's for a small family of references to age and compare. Doing the sums a difference measure between each one and graphed will tell me which ones are the most stable, then after a year or so splash out and get one calibrated against a known source.
> >>
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