Thermal type gas flow measuring instrument

Details Thermal type gas flow measuring instrument Thermal type gas flow measuring instrument

2007-05-08

2007-05-08

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

C073S204150

Reexamination Certificate

active

11012290

ABSTRACT:
A thermal type gas flow measuring instrument measures gas flow with high precision by accurately correcting changes in radiation heat characteristics of a heating resistor due to contamination. The instrument comprises a second heating resistor30whose resistance value, which changes if contaminated, is calculated by measuring the terminal voltage thereof by calculating means32,and the calculated value is compared with a temperature detected by a temperature detecting element31.Based on the result of comparison, the level of contamination of the second heating resistor30is determined. The second heating resistor30and the first heating resistor3are disposed in similar environments such that their levels of contamination can be considered equal. Based on the level of contamination calculated from the result of comparison, a correction value is calculated and the output of the first heating resistor3is corrected in accordance with the correction value.

REFERENCES:
patent: 4264961 (1981-04-01), Nishimura et al.
patent: 4649745 (1987-03-01), Kondo et al.
patent: 6230559 (2001-05-01), Igarashi et al.
patent: 6349596 (2002-02-01), Nakada et al.
patent: 6435023 (2002-08-01), Kobayashi et al.
patent: 2004/0025584 (2004-02-01), Akamatsu et al.
patent: 3910676 (1990-10-01), None
patent: 1065475 (2001-01-01), None
patent: 11-295125 (1999-10-01), None

Affiliated with

Also associated with

Rating

Thermal type gas flow measuring instrument does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Thermal type gas flow measuring instrument, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal type gas flow measuring instrument will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3782307