If they are all the same price then buying the higher pressure PX119-600GI instead sounds good to me. We need at least 150 psi for two of the transducers.
On Fri, Dec 15, 2017 at 1:15 PM, Musil Mark <[email protected]> wrote: > Kristin, > > After speaking with Jacob, he asked why we aren't buying two 600 PSI > version (PX119-600GI) so that they can be reused for other projects? I > don't want to waste $200 on something we only use once. Is there something > we gain using the PX119-150GI? > > Thanks, > > Mark M. > > On Mon, Dec 11, 2017 at 9:27 PM, Kristin Travis <[email protected]> > wrote: > >> 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> >>>>> >>>> >>>> >> > > > -- > > Mark Musil > > Bachelor's of Science Student > > Electrical Engineering > > Portland State University > > (503)-744-9965 <(503)%20744-9965> >
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