I scoured the rocket room for pressure transducers and I found 4 of them. 2 of them are from the RCS. Assuming we can use the ones from the RCS, then Mark only needs to order 2. We need a total of 5, but I think it would be better to have two identical pressure transducers on each side of the orifice plate for accuracy of measurement, but correct me if I'm wrong there.
Mark please order 2 of these unless someone else has a reason why not: Part number: PX119-150GI Quantity: 2 https://www.omega.com/pressure/pdf/PX119.pdf I've updated the pressure transducers on the Injector Test Stand BOM. You can look up their spec sheets there. Here are the transducers I found tonight: Brand: Ashcroft (from RCS) PSIG: 300 Output: 1-5V dc Supply: 9 -36V dc UPC: 783029566565 Brand: Ashcroft (from RCS) PSIG: 5000 Output: 1-5V dc Supply: 9 -36V dc UPC: 783029578773 Brand: Ashcroft (in cabinet) PSIG: 3000 Output: 1-5V dc Supply: 9 -36V dc UPC: 783029578988 Brand: Wika (in cabinet) (not going to be used for Pintle test, but we could use it instead of another one, it's outputs are in mA) PSIG: 3000 Output: 20 mA Supply: 30V Part #: 50426478 https://www.alliedelec.com/m/d/e954571cfc08a84399906b15b2c910da.pdf On Mon, Dec 11, 2017 at 5:15 PM, Musil Mark <[email protected]> wrote: > Ok, let me know. > > On Dec 11, 2017 2:00 PM, "Kristin Travis" <[email protected]> > wrote: > >> Hi Mark, >> >> Bert told me we already have 3 of them, 1x300psi, 2x3000psi. I'm >> planning on verifying what we have in the rocket room after work tonight. >> >> If what Bert remembers is true then we would only need you to order two: >> >> Part number: PX119-150GI >> Quantity: 2 >> >> I will confirm this for sure tonight. >> >> Thanks, >> Kristin >> >> On Mon, Dec 11, 2017 at 12:45 PM, Musil Mark <[email protected]> >> wrote: >> >>> Hey all, I need to know which of the transducers to order before Tuesday >>> at 11 am or nothing is getting ordered. >>> >>> Thanks, >>> >>> Mark M. >>> >>> On Fri, Dec 8, 2017 at 3:04 PM, Musil Mark <[email protected]> >>> wrote: >>> >>>> Kristin, I'm not sure I can afford to buy all 5 of these considering >>>> they are $100 each and that I have to also budget for the rest of TSAR's >>>> needs. We only need two right now correct? Which of two following are the >>>> correct items? >>>> >>>> PX119-1KGI >>>> PX119-600GI >>>> PX119-150GI >>>> PX119-150GI >>>> PX119-150GI >>>> >>>> On Fri, Dec 8, 2017 at 1:39 PM, Kristin Travis < >>>> [email protected]> wrote: >>>> >>>>> I put my best guess on the "Injector_TestStand_BOM" document in the >>>>> google drive. Do we already have some of these pressure transducers? >>>>> They are numbered 1-5 per the "Cold Flow Test Setup.pptx" document in >>>>> the google drive. >>>>> >>>>> Here are links to the documents I'm talking about: >>>>> >>>>> https://drive.google.com/open?id=1_UoEC2JRzY2DLnE0AtKBU7LnNo >>>>> Ws0JkLJEzGzN2dxwE >>>>> https://drive.google.com/open?id=1UYHwrgAT7fKGPJ_pPsm12rLELb >>>>> gulF4_oiMuiKvGqQQ >>>>> >>>>> On Fri, Dec 8, 2017 at 12:28 PM, Kristin Travis < >>>>> [email protected]> wrote: >>>>> >>>>>> What time are you ordering them on Tuesday? >>>>>> >>>>>> I'm not sure if we already have some that we can use. We need a total >>>>>> of 5, and they will be for different pressures. Yes, different >>>>>> pressures/part numbers can be ordered from that pdf >>>>>> >>>>>> It would be great to double check with Jacob, Bert and Erin first to >>>>>> confirm which pressures/part numbers to order. >>>>>> >>>>>> Thanks, >>>>>> Kristin >>>>>> >>>>>> On Fri, Dec 8, 2017 at 12:18 PM, Musil Mark <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> I am going to order two of those next Tuesday when I meet with my >>>>>>> advisor. >>>>>>> >>>>>>> thanks, >>>>>>> >>>>>>> Mark M. >>>>>>> >>>>>>> On Tue, Nov 28, 2017 at 9:29 PM, Kristin Travis < >>>>>>> [email protected]> wrote: >>>>>>> >>>>>>>> Rob and I figured out the coefficient (~0.36) for the McMaster >>>>>>>> orifice (https://www.mcmaster.com/#2712t47/=1agjtnf) and the hole >>>>>>>> size (3/8") we need to drill in it. (drilling the hole will change the >>>>>>>> coefficient but this is the most conservative). This will result in >>>>>>>> ~200 >>>>>>>> psi drop across the orifice at the 3 lbm/s flowrate. If we use two of >>>>>>>> these >>>>>>>> transducers https://www.omega.com/pressure/pdf/PX119.pdf the error >>>>>>>> should remain significantly below 10% leaving us room to add error by >>>>>>>> drilling the hole in the orifice. >>>>>>>> >>>>>>>> On Tue, Nov 28, 2017 at 1:01 PM, Bertrand DeChant < >>>>>>>> [email protected]> wrote: >>>>>>>> >>>>>>>>> Undesirable conditions should result in failsafe(likely shutdown >>>>>>>>> and Purge). Mitigation of sensing error(extreme) should be >>>>>>>>> considered. This >>>>>>>>> is not an issue for pintle testing where pressure data can be >>>>>>>>> calibrated >>>>>>>>> and used only for water. >>>>>>>>> >>>>>>>>> On Nov 28, 2017 12:55 PM, "Joseph Shields" <[email protected]> >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>>> > If all else fails in this regard, we're out about $100 as >>>>>>>>>> opposed to $$$ for a gox safe transducer. >>>>>>>>>> >>>>>>>>>> If you got misleading pressure measurements from it, what other >>>>>>>>>> parts might get damaged? Like, say you got a low measurement and >>>>>>>>>> opened >>>>>>>>>> some upstream valve in response. >>>>>>>>>> >>>>>>>>>> On Nov 28, 2017 12:49 PM, "Bertrand DeChant" < >>>>>>>>>> [email protected]> wrote: >>>>>>>>>> >>>>>>>>>> Absolutely, the ones that were previously specc'd for the engine >>>>>>>>>> should work well in this pressure range. These would be recycled for >>>>>>>>>> the >>>>>>>>>> igniter (engineer chamber pressure) and the engine (fuel manifold >>>>>>>>>> pressure). I'll look at the specs and point out expected factors of >>>>>>>>>> error >>>>>>>>>> this afternoon or evening. As for an oxygen environment it seems the >>>>>>>>>> previous plan to standoff/pack is the industry standard and >>>>>>>>>> reasonable for >>>>>>>>>> our budgeting needs. If all else fails in this regard, we're out >>>>>>>>>> about >>>>>>>>>> $100 as opposed to $$$ for a gox safe transducer. >>>>>>>>>> >>>>>>>>>> On Nov 28, 2017 12:40 PM, "Erin Schmidt" <[email protected]> wrote: >>>>>>>>>> >>>>>>>>>>> Hi guys, >>>>>>>>>>> I'm sick and won't be coming to the meeting tonight. For what it >>>>>>>>>>> is worth here are my thoughts: >>>>>>>>>>> -I think we should aim for <10% measurement uncertainty. >>>>>>>>>>> --This probably is expensive to achieve over our range of >>>>>>>>>>> flow rates with most kinds of flow meters (though we could do more >>>>>>>>>>> research >>>>>>>>>>> here). >>>>>>>>>>> --The dP tranducer has error +/- 5 psig, if we pick the >>>>>>>>>>> larger orifice we will have 50% measurement uncertainty at the 1 >>>>>>>>>>> lb/s >>>>>>>>>>> flowrate. If we want to lower the uncertainty by increasing the >>>>>>>>>>> pressure >>>>>>>>>>> drop, then we need to factor in the added expense of the >>>>>>>>>>> higher-pressure dP >>>>>>>>>>> sensor (note that even the 260psi dP sensor would have ~17% error @ >>>>>>>>>>> 1 lb/s). >>>>>>>>>>> --Probably our best bet is to use 2 transducers in lieu of a >>>>>>>>>>> single dP transducer. Some of the ashcroft/omega ones easily meet >>>>>>>>>>> our >>>>>>>>>>> requirements and we can move to a bigger pressure drop to improve >>>>>>>>>>> accuracy. >>>>>>>>>>> I also like this because the sensors won't be 1-offs and >>>>>>>>>>> potentially could >>>>>>>>>>> be recycled into other projects. Bert and/or Jacob, was there a >>>>>>>>>>> sensor you >>>>>>>>>>> liked for LFETS applications? If so can you send me a link to the >>>>>>>>>>> spec >>>>>>>>>>> sheet? >>>>>>>>>>> --An alternate option is to relax either our range of flow >>>>>>>>>>> rates or measurement accuracy requirements. Thoughts about this >>>>>>>>>>> Kristin? >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> Ad astra, >>>>>>>>>>> Erin Schmidt >>>>>>>>>>> >>>>>>>>>>> On Sun, Nov 26, 2017 at 10:10 PM, Kristin Travis < >>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>> >>>>>>>>>>>> dP presure transducers get pretty expensive if you go above 250 >>>>>>>>>>>> psi. Maybe a flowmeter costs less than the orifice + the dP >>>>>>>>>>>> transducer + >>>>>>>>>>>> the fittings and tubes for the dP transducer? Or if we drill out >>>>>>>>>>>> the >>>>>>>>>>>> orifice to have a larger hole, can we drop the dP below 250psi >>>>>>>>>>>> (assuming >>>>>>>>>>>> it's 250 psi dP across the transducer)? >>>>>>>>>>>> >>>>>>>>>>>> Let's go over this on Tuesday >>>>>>>>>>>> >>>>>>>>>>>> On Thu, Nov 23, 2017 at 11:59 AM, Musil Mark < >>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>> >>>>>>>>>>>>> Ok, I will await your modified order. >>>>>>>>>>>>> >>>>>>>>>>>>> On Nov 23, 2017 11:27, "Erin Schmidt" <[email protected]> wrote: >>>>>>>>>>>>> >>>>>>>>>>>>>> The dp treasurer will not work for the range of flow rates >>>>>>>>>>>>>> required (either the pressure is too high for the sensor, or the >>>>>>>>>>>>>> measurement error>50%). Let's respec it. >>>>>>>>>>>>>> >>>>>>>>>>>>>> On Nov 22, 2017 7:14 PM, "Mark Musil" <[email protected]> wrote: >>>>>>>>>>>>>> >>>>>>>>>>>>>>> The current purchase order is attached. Nothing has been >>>>>>>>>>>>>>> ordered. Let me know what needs changed. >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> On Nov 22, 2017 5:04 PM, "Kristin Travis" < >>>>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Hi Erin, >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> The dP transducer we spec-ed is this >>>>>>>>>>>>>>>> https://www.omega.com/pressure/pdf/PX26.pdf >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> I cc'd Mark Musil, did you order this yet Mark? >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Thanks, >>>>>>>>>>>>>>>> Kristin >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> On Wed, Nov 22, 2017 at 4:34 PM, Erin Schmidt < >>>>>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> BTW have you guys ordered any of the 'general purpose' >>>>>>>>>>>>>>>>> pressure transducers yet? I'd like to have a look at the >>>>>>>>>>>>>>>>> spec. sheet. >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> Ad astra, >>>>>>>>>>>>>>>>> Erin Schmidt >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> On Tue, Nov 21, 2017 at 10:13 PM, Erin Schmidt < >>>>>>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> Guys, >>>>>>>>>>>>>>>>>> I want your feedback on this orifice: Brass, 2712T47, 0.047" >>>>>>>>>>>>>>>>>> diameter, 1/2"X1/2" NPT ($24.69) >>>>>>>>>>>>>>>>>> *https://www.mcmaster.com/#2712t47/=1ad0hiu >>>>>>>>>>>>>>>>>> <https://www.mcmaster.com/#2712t47/=1ad0hiu>* >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> Gets us a 30 psi drop at the low end of our flow range >>>>>>>>>>>>>>>>>> (still not sure if 30 psi is too much for flow measurement >>>>>>>>>>>>>>>>>> accuracy, the >>>>>>>>>>>>>>>>>> corresponding drop will be 120 psi @ 2 lb/s and 260 psi @ 3 >>>>>>>>>>>>>>>>>> lb/s😑). This >>>>>>>>>>>>>>>>>> implies we need a maximum tank pressure of around 344 psi. >>>>>>>>>>>>>>>>>> If we go up to >>>>>>>>>>>>>>>>>> a 0.063" diameter the range is a bit more reasonable (10, >>>>>>>>>>>>>>>>>> 35, 80 psi @ 1, >>>>>>>>>>>>>>>>>> 2, 3 lb/s). Have we had any luck speccing the delta-p >>>>>>>>>>>>>>>>>> transducer yet? >>>>>>>>>>>>>>>>>> Knowing the accuracy of the measurement will help us make a >>>>>>>>>>>>>>>>>> more informed >>>>>>>>>>>>>>>>>> decision about the orifice... >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> Ad astra, >>>>>>>>>>>>>>>>>> Erin Schmidt >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> On Tue, Nov 14, 2017 at 10:43 PM, Erin Schmidt < >>>>>>>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> https://neutrium.net/fluid_flo >>>>>>>>>>>>>>>>>>> w/discharge-coefficient-for-nozzles-and-orifices/ >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> Ad astra, >>>>>>>>>>>>>>>>>>> Erin Schmidt >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> _______________________________________________ >>>>>>>>>>> psas-airframe mailing list >>>>>>>>>>> [email protected] >>>>>>>>>>> http://lists.psas.pdx.edu/mailman/listinfo/psas-airframe >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>> _______________________________________________ >>>>>>>>>> psas-airframe mailing list >>>>>>>>>> [email protected] >>>>>>>>>> http://lists.psas.pdx.edu/mailman/listinfo/psas-airframe >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> >>>>>>> Mark Musil >>>>>>> >>>>>>> Bachelor's of Science Student >>>>>>> >>>>>>> Electrical Engineering >>>>>>> >>>>>>> Portland State University >>>>>>> >>>>>>> (503)-744-9965 <(503)%20744-9965> >>>>>>> >>>>>> >>>>>> >>>>> >>>> >>>> >>>> -- >>>> >>>> Mark Musil >>>> >>>> Bachelor's of Science Student >>>> >>>> Electrical Engineering >>>> >>>> Portland State University >>>> >>>> (503)-744-9965 <(503)%20744-9965> >>>> >>> >>> >>> >>> -- >>> >>> Mark Musil >>> >>> Bachelor's of Science Student >>> >>> Electrical Engineering >>> >>> Portland State University >>> >>> (503)-744-9965 <(503)%20744-9965> >>> >> >>
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