Measuring and testing – Volume or rate of flow – Thermal type
Patent
1998-01-06
2000-03-07
Patel, Harshad
Measuring and testing
Volume or rate of flow
Thermal type
7320425, G01F 168
Patent
active
060325259
ABSTRACT:
A thermosensitive flowmeter includes a first thermosensitive resistor "Rh" for detecting a flow rate of a fluid in a fluid passage 19, a second thermosensitive resistor "Rk" for detecting an atmospheric temperature in the fluid passage, a power supply 1 for supplying a current to respective thermosensitive resistors, a first control circuit 11 for controlling a first consuming current "ih" so that the heating temperature of the first thermosensitive resistor is made to a predetermined temperature, and a second control circuit 16 for controlling a second current "ik" flowing to the second thermosensitive resistor so that it is smaller than the first consuming current by a predetermined ratio. The second control circuit responds to a voltage across the first thermosensitive resistor, whereby a self-heating of the second thermosensitive resistor is reduced by reducing the consumed current, and the number of connecting terminals to the printed wiring board on the fluid passage is reduced by a simple arrangement. With this arrangement, the thermosensitive flowmeter having high accuracy and high reliability can be obtained without an increased cost.
REFERENCES:
patent: 4080821 (1978-03-01), Johnston
patent: 4845984 (1989-07-01), Hohenstatt
patent: 5237867 (1993-08-01), Cook
"New Sensor Technology Development and Most Appropriate Selection or Utility" Integrated Techniques Reference Collection, vol. 1, Management Development Center Publishing Department, pp. 424-425, 426, 1978.
Mitsubishi Denki & Kabushiki Kaisha
Patel Harshad
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