Flow sensor system

Details Flow sensor system Flow sensor system

1994-07-12

1995-10-24

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Thermal type

7320416, 7320419, 7320418, 73202, 73195, G01F 168

Patent

active

054600391

ABSTRACT:
A system for measuring the flow rate of gas includes a flow head having a sensor thermoresistor mounted transversely to the flow of gas, and a reference thermoresistor mounted parallel to the flow of gas, both thermoresistors having equal resistance versus temperature functions. Each thermoresistor is connected in a feedback control circuit, in which each thermoresistor is separately supplied with current to heat it, the current first passing through a fixed resistance in series with each of the thermoresistors. The current supplies are servo controlled to equalize the resistance of each thermoresistor with that of its associated fixed resistance. The power consumed by each thermoresistor at its equilibrium resistance is measured to provide a power indicative signal associated with each thermoresistor. The two power indicative signals are compared to generate a delta power signal. An empirically-derived flow rate-versus-delta power curve is stored as a look-up table in a computer memory. The value of the delta power signal is applied to address the look-up table to acquire the corresponding flow rate value.

REFERENCES:
patent: Re33076 (1989-10-01), Sugiura
patent: 2726546 (1955-12-01), King, Jr.
patent: 3085431 (1963-04-01), Yerman et al.
patent: 3363462 (1968-01-01), Sabin
patent: 3603147 (1971-09-01), Dorman
patent: 3645133 (1972-02-01), Simeth et al.
patent: 3648518 (1972-03-01), Hans et al.
patent: 3747577 (1973-07-01), Mauch et al.
patent: 4008610 (1977-02-01), Larsen et al.
patent: 4024761 (1977-05-01), Djorup
patent: 4043196 (1977-08-01), Trageser
patent: 4080821 (1978-03-01), Johnston
patent: 4244217 (1981-01-01), Ledbetter
patent: 4297881 (1981-11-01), Sasayama et al.
patent: 4343183 (1982-08-01), Plapp
patent: 4344322 (1982-08-01), Plapp
patent: 4363238 (1982-12-01), William
patent: 4373387 (1983-02-01), Nishimura et al.
patent: 4464932 (1984-08-01), Ewing et al.
patent: 4497203 (1985-02-01), Wada
patent: 4527427 (1985-07-01), Grunwald
patent: 4537068 (1985-08-01), Wrobel et al.
patent: 4562731 (1986-01-01), Nishimura et al.
patent: 4596140 (1986-06-01), Dorman et al.
patent: 4599895 (1986-07-01), Wiseman
patent: 4627279 (1986-12-01), Ohta et al.
patent: 4686856 (1987-08-01), Vavra et al.
patent: 4807151 (1989-02-01), Citron
patent: 4845984 (1989-07-01), Hohenstatt
patent: 4854167 (1989-08-01), Czarnocki et al.
patent: 4905514 (1990-03-01), Wiseman
patent: 4938061 (1990-07-01), Carp
patent: 4982605 (1991-01-01), Oram et al.
patent: 5072614 (1991-12-01), Hisanaga
patent: 5181420 (1993-01-01), Sugiura
patent: 5263369 (1993-11-01), Cutler

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