Measuring and testing – Volume or rate of flow – Thermal type
Patent
1994-06-23
1995-10-31
Chilcot, Richard
Measuring and testing
Volume or rate of flow
Thermal type
7320415, G01F 168
Patent
active
054619130
ABSTRACT:
The disclosed mass flow transducer is of the type including a balanced bridge comprising two, substantially identical, thermal elements forming two sides of the bridge between the top and the bottom of the bridge, the two elements being adapted to be positioned in two regions of a laminar flow tube in a symmetrical tandem arrangement so as to sense flow through the tube, one element being upstream from the other. The preferred transducer includes control means for monitoring the voltage at the top and bottom of the bridge and monitoring the current required to maintain the node between the thermal elements at virtual ground.
REFERENCES:
patent: 3851526 (1974-12-01), Drexel
patent: 4205556 (1980-06-01), Runyan
patent: 4464932 (1984-08-01), Ewing et al.
patent: 4548075 (1985-10-01), Mariano
patent: 4624138 (1986-11-01), Ono et al.
patent: 4984460 (1991-01-01), Isoda
patent: 5142907 (1992-09-01), Hinkle
Hinkle Luke D.
Provost James
Chilcot Richard
MKS Instruments Inc.
Patel Harshad
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