Conversation with Griswold Controls

Discussion in 'Irrigation' started by FIMCO-MEISTER, Oct 20, 2010.

  1. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,098

    explain further please :)
     
  2. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,775

    Just curious, because I've seen my meters peg and never really knew what the bump was. My liquid-filled meters go to 125 psi and they pegged!
     
  3. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,943

    I've installed some 300 psi gauges when it looked like the 200 psi gauges were going to peg on a regular basis.
     
  4. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,775

  5. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,943

  6. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,098

    i have 2 watts spike or maximum reading gauges, the only thing that i don't like is that they're dry and tend to bounce a little i don't think a liquid filled would as much. :)

    100_1005.jpg
     
  7. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,098

    Doppler flow meters www.greyline.com/products.htm

    please explain

    what's this got to do with your statement "Dial gauges of any sort wouldn't do to measure instantaneous forces."

    i love the badgers, answer the friggin question!

    sorry, it's all that time i've been spending with kiril :laugh:
     
    Last edited: Oct 23, 2010
  8. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,943

    You can't measure instantaneous forces with measuring devices that have moving parts, since those moving parts will be subject to inertial forces. The reading would lag the actual event, if it was even accurate in the first place. It will probably take a piezoresistive, or piezoelectric, sensor to get the job done.
     
  9. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,098

    makes sense, i installed some piezometers to log ground shift for a developer a number of years ago.

    they're also used in well water and sewage studies.

    but we can also look at the definition;

    instantaneous [ˌɪnstənˈteɪnɪəs]
    adj
    1. occurring with almost no delay; immediate
    2. happening or completed within a moment instantaneous death
    3. (Mathematics) Maths
    a. occurring at or associated with a particular instant
    b. equal to the limit of the average value of a given variable as the time interval over which the variable is considered approaches zero instantaneous velocity
    instantaneously adv
    instantaneousness , instantaneity [ɪnˌst├Žntəˈniːɪtɪ] n
     
  10. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,943

    Just how instantaneous this could be, for sake of measuring, I don't know. Figure on sensors hooked up to a storage oscilloscope. I'm certain the needle swings I saw on a 300 psi gauge were indicating pressures above 150 psi, and yet the Richdel 1-1/2 inch master valve didn't blow up.
     

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