Title:
熱式流量計および流量補正方法
Document Type and Number:
Japanese Patent JP6843014
Kind Code:
B2
Abstract:
A thermal flowmeter includes: a first thermal resistive element disposed on a pipe and sensing a first temperature of a fluid; a second thermal resistive element disposed on the pipe downstream relative to the first thermal resistive element and sensing a second temperature thereof; a control unit causing the second thermal resistive element to generate heat so that the second temperature is kept higher than the first temperature by a predetermined value; a power measurement unit measuring a power supplied to the second thermal resistive element; a temperature difference gradient calculation unit calculating a gradient of a difference between the second and first temperatures; a power compensation unit compensating the measured power based on the gradient of the difference and a value of the power when no fluid is in the pipe; and a flow rate calculation unit calculating a flow rate of the fluid based on the compensated power.
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Inventors:
Yusei Yanagawa
Yoshio Yamazaki
Shinsuke Matsunaga
Wataru Hasebe
Yoshio Yamazaki
Shinsuke Matsunaga
Wataru Hasebe
Application Number:
JP2017147621A
Publication Date:
March 17, 2021
Filing Date:
July 31, 2017
Export Citation:
Assignee:
Azbil Co., Ltd.
International Classes:
G01F1/699
Domestic Patent References:
| JP3707610B2 | ||||
| JP3510131B2 | ||||
| JP2502570B2 |
Foreign References:
| US5629481 |
Attorney, Agent or Firm:
Shigeki Yamakawa
Masaki Yamakawa
Masaki Yamakawa