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DanielleFong's profile
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@DanielleFong

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@DanielleFong

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Empire of the Future
Joined February 2008

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    1.  🌻 𝙼𝚎𝚊𝚍𝚘𝚠 𝙴𝚕𝚕𝚒𝚜 (2).arj  🌻‏ @notameadow 4 Apr 2021

      Can someone who is American explain this to me like I am 5? I know that sea level press is around 14.7PSI which equals about 100kPa. The sensor I have shows about that, 1.3V which makes it about 100kPa according to the char. WHY IS THE PSI SCALE LIKE THIS THERE?!pic.twitter.com/UlkPRpn5AS

      5 replies 0 retweets 5 likes
      Show this thread
    2.  🤷🏻‍♀️‏ @DanielleFong 4 Apr 2021
      Replying to @notameadow

      when you read psi there are two kinds of readings, psia (absolute) or psi-gauge, which is a pressure reading that subtracts out a baseline pressure of 14.7 psi this is a helpful linkhttps://www.google.com/amp/s/www.setra.com/blog/the-difference-between-psi-psia-psig%3fhs_amp=true …

      1 reply 0 retweets 5 likes
    3.  🌻 𝙼𝚎𝚊𝚍𝚘𝚠 𝙴𝚕𝚕𝚒𝚜 (2).arj  🌻‏ @notameadow 4 Apr 2021
      Replying to @DanielleFong

      Yes, this sensor is supposed to be PSIa :(

      1 reply 0 retweets 1 like
       🤷🏻‍♀️‏ @DanielleFong 4 Apr 2021
      Replying to @notameadow

      to get from kPa to psi, it’s just (kPa val)*(14.7 psi/100 kPa), it’s just a linear read out from 0.5 Volts to 4.5 volts, from 0 kPa to 515 kPa. so pressure in kPa is just ((V - 0.5)/4)* 515 kPa or ((V - 0.5)/4)* 5.15 * 14.7 psi(a)

      6:39 PM - 4 Apr 2021
      • 1 Like
      • Natanael, tech custodial engineer
      1 reply 0 retweets 1 like
        1. New conversation
        2.  🌻 𝙼𝚎𝚊𝚍𝚘𝚠 𝙴𝚕𝚕𝚒𝚜 (2).arj  🌻‏ @notameadow 4 Apr 2021
          Replying to @DanielleFong

          Yea but why this chart shows absolute for kPa and relative for Psi? What did I miss?

          1 reply 0 retweets 0 likes
        3.  🤷🏻‍♀️‏ @DanielleFong 4 Apr 2021
          Replying to @notameadow

          kPa is usually an absolute measurement, psi is sometimes a gauge measurement. the graph is just to give you a convenient read out to whatever unit you’re using but they didn’t spell out that were using psi (g) and kPa (a) should be obvious cause you don’t have negative pressures

          1 reply 0 retweets 2 likes
        4. Show replies

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