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Thread: testing 0.25 in water manometer

  1. #1 testing 0.25 in water manometer 
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    I need to test this gauge. It reads -0.25 to 0 to +0.25 in water. Im using it in the 0.02 to 0.03 negative and

    positive ranges. What of known value can I use to deflect this gauge maybe .1 or .05 in either or both

    directions to test the gauges accuracy?

    pa


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  3. #2  
    Bullshit Intolerant PhDemon's Avatar
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    What do you mean? Do you want to replace the water with a liquid that will only move 0.1 to 0.5 for the same pressure difference that water moves 0.25 for? Or do you mean you want a known pressure to move the water by 0.1?

    Also what do you mean by the numbers, are these column heights or pressures?


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  4. #3  
    Forum Professor Zwolver's Avatar
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    Testing accuracy, would be to both measure the same thing multiple times, and calculating the standard variation. And measuring known values, on different points, and see how well it correlates and having a R^2 of close to 1.

    Manometer would be pressure i believe. And an analog dial has a standard error, and a digital dial has standard error. Also the measuring pin has a standard error. Plus the age of the device, or when it was callibrated. I believe you should simply test it again.

    What is your setup?

    Make a setup where you correlate water height, to water pressure. 10cm above the meter (on atmosphere) is 10cm waterpressure (and do 20 - 30 ..... 100cm). I believe you can easily calculate this into the units you want.
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  5. #4  
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    mount it inclined 10:1 for 10 times the resolution. Here: {no url allowed so you cant see what I mean}

    its graduated at 0.25 intervals and you can easily judge 1/5 of that. So, 0.25 included 10:1 the 0.25 would then be 0.025 and I could fairly accurately judge 1/5 of that or 0.005.

    thoughts?
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