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Measuring a specific air pressure

Discussion in 'Misc Electronics' started by [email protected], Feb 8, 2008.

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  1. Guest

    Is there a way to measure a specific air pressure accurately (e.g. 30 psi)
    without using precision equipment?

    Thanks for any information.

  2. default

    default Guest

    It is called a pressure gauge.

    There must be more to the question.
  3. Sjouke Burry

    Sjouke Burry Guest

    measure water column height,10 m equals one bar, and
    quite accurate.(but a little bit clumsy).
    Or use mercury, 1 m 52cm for 2 bar.
  4. could use a pressure switch - closed above 30 PSI, open below
    30 PSI - could be quite accurate but gives you very little precision.

    What, exactly, are you trying to do? How accurate? How precise? How
    much money do you have? How many times a second do you need to update
    the reading? Analog or digital?

    Are cryogenic fluids involved, or hot combustion gasses, or corrosion,
    or ionizing radiation? Does the measurement equipment have to be
    food-safe, explosion-proof, FAA certified, FCC type-accepted, CSA/UL
    registered, IEC standard or ISO 9001 registered? Must it have a GSA
    number? Will you be using this on a submarine or a space vehicle? Can
    it use proprietary intellectual property or must it be open-source and
    public domain?

    Must the measurement be made available remotely via a Web server or is a
    pointer on a scale good enough? What units of measurement do you need?
    Does it have to be traceable to NBS or other national standards
    laboratory? Will it be used by carnies, cops, convicts,con-men,
    consumers, Christians, cowboys,coxswains, copywriters, co-pilots or
    others? Are you allowed to use mercury, cadmium, nickel, asbestos, PCBs,
    or volatile organic chemicals?

    Must it be movable by a batallion, air-dropped, man-portable,
    pocket-sized, implantable,or permanently installed? Should it float or
    be waterproof or be submersible? What temperature range is required?
    Indoor or outdoor? Does it need an RS-232 interface? Bluetooth? Zigbee?
    International Morse Code at 25 words per minute? Must it be painted in
    your corporate colors?

    Is it a one-off or will you be ordering a million units per year? What
    field service organization is required to support it? Can it be
    maintained by a team of graduate students or must it be field-repairable
    by a Third World bicycle shop? Must it be legal to export to North
    Korea? Will it be used in a life-support application? Must it be made of
    biocompatible materials? Should it be recyclable and comply with ROHS
    directives? Does it have to have a warranty? A guarantee? A patent? A
    license? What happens if the measurement is no good?

    some of these questions may be relevant; answers to many of them would
    allow others a better chance to help you.

  5. Guest


    I'm trying to verify a couple of tire pressure gauges.

    They are notoriously inaccurate.

    All I need is a reference point accurate to plus/minus 1 psi.

    Thanks for the reply.

  6. Guest


    Thanks for the response.

    I'm trying to verify a couple of tire pressure gauges.

    They are notoriously inaccurate.

    All I need is a reference point accurate to plus/minus 1 psi.

    I think that I have a slight learning curve to convert "bar" to "psi".

  7. Guest


    Sorry, I wasn't specific on my requirements.

    Please read my response to other posters.

  8. Guest

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