Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1979-11-13
1981-07-14
Yasich, Daniel M.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
G01K 724
Patent
active
042779758
ABSTRACT:
Apparatus for sensing and displaying temperature at a site includes a sensor which provides a first current related to temperature at the site, and a circuit for generating a predetermined current. The apparatus also includes a capacitance responsive to a second current having a value proportional to the difference between the first current and the predetermined current for generating a voltage; and means responsive to the generated voltage for discharging the capacitance to a predetermined voltage level when the voltage exceeds a selected reference level and for providing a signal indicating each time the voltage exceeds the reference level. The signal is periodic with a frequency related to sensed temperature and digital display means responsive to the frequency of the signal provide a numerical indication of temperature sensed. The values of the predetermined current, the capacitance and the periodic voltage change across the capacitance are selectable to indicate temperature in degrees Fahrenheit or Celsius.
REFERENCES:
patent: 4112764 (1978-09-01), Turner
patent: 4114446 (1978-09-01), Walsh
patent: 4117722 (1978-10-01), Helmstetter
patent: 4150573 (1979-04-01), Iinuma et al.
patent: 4165642 (1979-08-01), Lipp
patent: 4224537 (1980-09-01), Glazer
General Electric Company
Nieves Carlos
Platt Leonard J.
Powers George R.
Yasich Daniel M.
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