Measuring and testing – Volume or rate of flow – Thermal type
Patent
1996-09-19
1998-09-22
Biegel, Ronald L.
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
058098275
ABSTRACT:
A threshold value is stored in a CPU using setting switches. When a fluid is introduced into a flow passage, it lowers the temperature of a first thermistor heated by a regulated constant-current source, increasing the output voltage of the first thermistor. A second thermistor outputs a voltage corresponding to the temperature of the fluid. A differential amplifier outputs a differential voltage between the output voltages of the first and second thermistors, and the differential voltage is converted by an A/D converter into a digital voltage that is applied to a CPU. The CPU refers to a data table stored in a memory to determine a flow rate of the fluid based on the digital differential voltage. When the determined flow rate is greater than the threshold value, the CPU turns on transistors to energize loads as external devices. When the determined flow rate is smaller than the threshold value, the CPU turns off transistors to de-energize loads.
REFERENCES:
patent: 3142170 (1964-07-01), Calhoun
patent: 3335606 (1967-08-01), Scarpa
patent: 3372590 (1968-03-01), Sterling
patent: 3891391 (1975-06-01), Boone
patent: 3975951 (1976-08-01), Kohama et al.
patent: 4480467 (1984-11-01), Harter et al.
patent: 4627279 (1986-12-01), Ohta et al.
patent: 4860583 (1989-08-01), Olson
patent: 5072614 (1991-12-01), Hisanaga
patent: 5569851 (1996-10-01), Ichimura et al.
Omega catalog, The Flow and Level Handbook, vol. 29, copyright 1995, G-4, 8, M-3, 8, 30.
Endou Tomonobu
Ge Pinghou
Kurisaki Shogo
Takebayashi Takashi
Biegel Ronald L.
Patel Harshad
SMC Kabushiki Kaisha
LandOfFree
Flow rate detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flow rate detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flow rate detector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1613005