Measuring and testing – Volume or rate of flow – Thermal type
Patent
1984-08-30
1986-04-15
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
045819300
ABSTRACT:
A thermal type flow meter for measuring the mass flow rate of a fluid medium especially that of a gas in a duct, said meter comprising a plurality of thermistors operated electrically in the "self-heated" mode located on the trailing edge of rigid, rectangular members oriented with the long axis perpendicular to the primary direction of flow. The thermistors are located strategically throughout transverse plan of the duct. Each sensor (thermistor) is located substantially at the center of the downstream end of a right circular cylinder. The voltage drops through all of the thermistors located in a two-dimensional array oriented normal to the flow direction are summed electrically using an operational amplifier. Due to both the geometrical location of the sensors and the characteristics of thermistors in the self-heated mode, the voltage drop across each sensor is linearly proportional to the local mass flow velocity. This allows the summed output from all of the flow dependent sensors to represent a true average of the flow in a duct providing a sufficient number of sensors exist to reveal the overall flow patterns in the duct.
REFERENCES:
patent: 4413514 (1983-11-01), Bowman
patent: 4476720 (1984-10-01), Dsmail et al.
patent: 4494406 (1985-01-01), Komons et al.
Ebtron, Inc.
Goldstein Herbert
Temko Charles E.
LandOfFree
Average mass flow rate meter using self-heated thermistors does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Average mass flow rate meter using self-heated thermistors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Average mass flow rate meter using self-heated thermistors will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1432170