Measuring and testing – Liquid level or depth gauge – Thermal type
Patent
1990-04-03
1991-05-14
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
Thermal type
7320425, 338 24, 36457103, 374136, G01F 2324, G01K 1302
Patent
active
050145533
ABSTRACT:
The temperature of one or several sensors which are electrically heated or cooled to a temperature substantially different from a stagnant or running fluid surrounding the said sensor or sensors by applying an electric current to the said sensor or sensors, and the temperature of the said fluid are measured simultaneously to calculate the temperature difference between the said sensor or sensors and the said fluid at an equilibrium state of heat transfer at the surface of the said sensor or sensors, thereby measuring a change in state of the said fluid collectively on an in-line processing basis without disturbing the said fluid; a change in this state results in a change in heat transfer coefficient at the surface of the said sensor or sensors, the coefficient being collectively correlated with the viscosity, density, specific heat, thermal conductivity, thermal diffusivity, coefficient of volumetric expansion, flow speed or flow direction of the said fluid at a given temperature.
REFERENCES:
patent: 3068693 (1962-12-01), Ferran et al.
patent: 3921450 (1975-11-01), Pfister
patent: 4244217 (1981-01-01), Ledbetter
patent: 4408902 (1983-10-01), Peuker
patent: 4513616 (1985-04-01), Bezard et al.
patent: 4825383 (1989-04-01), Ory
"Heated Sensor Finds Wide Application in Fluid Flow Measurements," CGS/Datametrics, Bulletin 600, 1971, 23 pages.
Review of Scientific Instruments, vol. 46, No. 2, Feb. 1975, pp. 185-191 (By S. Firasat Ali).
Hori Tomoshige
Itoh Kensuke
Snow Brand Milk Products Co. Ltd.
Yasich Daniel M.
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