×

Device for measuring the pressure of a gas like medium

  • US 4,628,739 A
  • Filed: 03/11/1985
  • Issued: 12/16/1986
  • Est. Priority Date: 07/07/1983
  • Status: Expired due to Fees
First Claim
Patent Images

1. Device for measuring the pressure of a gas-like medium by means of a piezoelectric measuring device, comprising two piezoelectric oscillators (10,11) disposed opposite each other and spaced from each other to define a hollow space therebetween, said piezoelectric oscillators being arranged in a substantially closed system into which a gas to be measured is introduced and wherein a first oscillator (10) is excited and a second oscillator (11) is coupled to the first oscillator (10) by means of a gas buffer which is contained in said hollow space (17) between the oscillators (10,11) and causes said second oscillator (11) to oscillate passively;

  • a conduit (16) connecting said hollow space with a remaining gas being measured (Po); and

    a reaction oscillator (12) mechanically connected to the first oscillator (10) so that an exciting signal (SR) of said reaction oscillator is applied to and acts at least indirectly on the oscillators (10,11) and on an output signal (S2) of said second oscillator so as to compensate for aging and temperature influences in said closed system.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×