Thermal flow meter, thermal flow meter control method, and...

Details Thermal flow meter, thermal flow meter control method, and... Thermal flow meter, thermal flow meter control method, and...

2008-09-30

2010-10-19

Thompson, Jewel (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

Reexamination Certificate

active

07814785

ABSTRACT:
A thermal flow meter corrects flow rate detection errors produced by vaporization of liquid phase components included in a gas to be measured. The thermal flow meter includes a correction circuit500that applies respectively different predetermined voltages to heating resistors consisting of first heating resistor Rh1and second heating resistor Rh2of a sensor element disposed in the gas to be measured to set a first temperature state and a second temperature state, calculates a first flow rate value Q1of the gas to be measured in the first temperature state and a second flow rate value Q2of the gas to be measured in the second temperature state, and calculates a flow rate correction value ΔQ based on a ratio (Q1/Q2) between the first flow rate value and second flow rate value or a fourth-power value (Q1/Q2)4of the ratio to correct a flow rate of the gas to be measured.

REFERENCES:
patent: 7726187 (2010-06-01), Sukegawa et al.
patent: 2008/0295590 (2008-12-01), Sukegawa et al.
patent: 2009/0223495 (2009-09-01), Ohata et al.
patent: 59-136620 (1984-08-01), None
patent: 2007-285756 (2007-01-01), None
patent: 2007-248136 (2007-09-01), None
patent: 2008-032501 (2008-02-01), None

Affiliated with

Also associated with

Rating

Thermal flow meter, thermal flow meter control method, and... 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 flow meter, thermal flow meter control method, and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal flow meter, thermal flow meter control method, and... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4227222