Title:
熱式流量計およびその異常判定方法
Document Type and Number:
Japanese Patent JP5835182
Kind Code:
B2
Abstract:
A thermal type flowmeter (101) includes a sensor element (10), an output circuit (11), a storage unit (20), and an abnormality determination unit (22). The sensor element (10) includes an upstream-side thermopile (1), a heater (2), and a downstream-side thermopile (3). The output circuit (11) outputs a signal expressing a flow rate of a fluid based on a difference voltage between an output voltage (Vu) of the upstream-side thermopile (1) and an output voltage (Vd) of the downstream-side thermopile (3). A referential relationship, in which a reference of a relationship between the voltages (Vu and Vd) is defined, is previously stored in the storage unit (20). The abnormality determination unit (22) compares the relationship between the voltage (Vu) output from the upstream-side thermopile (1) and the voltage (Vd) output from the downstream-side thermopile (3) to the referential relationship, and determines abnormalities of the upstream-side thermopile (1) and the downstream-side thermopile (3).
Inventors:
Ueda Nao
Fukumoto Masashige
Hideyuki Nakao
Fukumoto Masashige
Hideyuki Nakao
Application Number:
JP2012225821A
Publication Date:
December 24, 2015
Filing Date:
October 11, 2012
Export Citation:
Assignee:
OMRON Corporation
International Classes:
G01F1/68; G01F1/696; G01P5/10; G01P5/12
Domestic Patent References:
| JP6229800A | ||||
| JP3067883B2 | ||||
| JP3256658B2 | ||||
| JP765915B2 | ||||
| JP3726261B2 | ||||
| JP3527657B2 |
Attorney, Agent or Firm:
Fukami patent office