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Hot wire instrument reads

  • Hot wire instrument reads R.M.S value.
  • The instrument operates by passing a constant current through a thin wire, which heats up as a result of the current flow.
  • The wire is then exposed to the fluid whose velocity is to be measured, and the cooling effect of the fluid on the wire is used to determine the velocity.
  • The instrument measures the root-mean-square (RMS) value of this AC voltage signal to determine the fluid velocity.
  • The RMS value is a measure of the effective or average voltage of the AC signal over time and is proportional to the square root of the mean of the squares of the instantaneous values of the AC signal.
  • Therefore, it can be concluded that a hot wire instrument reads the RMS value of the AC voltage signal that is proportional to the velocity of the fluid being measured.