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Recent content by AJone

  1. AJone

    What is the best engineering advice you ever received?

    "Proof may just be lack of Imagination"
  2. AJone

    Piezoresistive Analysis of Pressure Sensor

    The resistor value itself will not get you the output. The relative change in resistance is what is needed. Assuming we are talking about a diffused resistor, the resistor geometery and orientation, crystal orientation, doping concentration/depth, and strain distribution and direction among...
  3. AJone

    measurement in psig vs psia

    As jsummerfield noted, an absolute pressure transducer most commanly has a sealed referenced chamber that makes for a true PSIA reading. The reference chamber is most often a vacuum on the back side of the measuring diaphragm and should not be affected by ambient conditions within the accuracy...
  4. AJone

    bellows design handbook

    Flat and Corrugated Diaphragm Diaphragm Design Handbook by Mario Di Giovanni This book includes a couple of chapters on bellows and presents simplified algebriac equations useful for optimizing designs.
  5. AJone

    welding of metal bellow

    I suppose there may be other candidates such as laser welding, but most of the small bellows welding I've seen is done with electron beam welding. Wengate is one manufacturer and systems are very expensve.
  6. AJone

    "Fas-Test" NPT adapters

    Has anyone heard of fittings called "Fas-Test"? My understanding is that they accept NPT threads but seal on the face of the fittings instead of the threads. I'm not looking for any reliability info, just who might have sold/made these items. Thanks, Mark
  7. AJone

    Thread checking

    http://personalpages.tds.net/~leitechmike/igp.htm http://www.auto-met.com/fowler/digi-thread.html Here are some more time consuming methods
  8. AJone

    cryogenic level measurement

    Would dropping a cyrogenic pressure sensor in the tank work? We have standard models down to 0-15PSIA that are around $1500.00 . Lower ranges or PSIG units would require additional charges. If you would like additional information, you can call 740-965-9340.
  9. AJone

    cheap fuel pressure sensor 10 Bar

    Most stock sensors under $20 have a sensor that is exposed to the media and attached with RTV. The RTV is probably not good for the application. One low cost possiblility may be a small silicon pressure sensor mounted on a flex circuit sold by keller. Not very accurate and you must create a way...
  10. AJone

    strains in membranes

    This may not be of any use, but this is about the thickness of your average strain gage which is also made of polymide. Maybe your material is suitable to have a strain sensitive foil printed on it or you could have a custom strain gage made to insert in place of the current membrane. Also...
  11. AJone

    low creep aluminum

    It's a little out dated, but the book "dimensional Instability" by Marschall from 1977 is a good primer. 2024-T6 is often employed for low capacity sensors. There's couple charts for microyield behavior of of this alloy I could provide if you interested. What kind of alloys have you...
  12. AJone

    stainless barb fitings

    http://www.microgroup.com/
  13. AJone

    NPT pressure ratings

    Swagelok is a good safe reference for this. Check out the following link: http://www.swagelok.com/downloads/webcatalogs/MS-01-147.pdf Obviously the max rating will depend on the application, forces on the connection, connection material, safety factors, etc. NPT threads are capable of sealing...
  14. AJone

    ball bearings for vacuum applications

    If the bearings are damaged due to deposits instead of wear, you be able to clean them in a solution such as vineager on a regular basis.
  15. AJone

    Bi polar differential amplifier assistance

    I assume you might be trying something like calibrating your test equipment/amplifier. Here the characteristics of the circuit that provides the signal may be important. In this case you may want somehting like a strain gage simultor. BLH sells a couple of models. Cheaper methods such as...
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