Keyence Corporation

Ryuma Miyake

Masaki Wada

Daishiro Ishikawa

Hiroki Matsui

Yasunori Kawaguchi

Daiki Matsumoto

Yuta Kato

Masaki Ishihara

To enable accurate measurement of a flow rate of a gas flowing in a non-metallic tube. An ultrasonic flowmeter includes a first wedge member having a first angle, a second wedge member having a second angle, and a flow rate measurement unit that measures a flow rate of a gas based on a propagation time difference of a longitudinal wave excited by a tube. The first angle and the second angle are configured such that the tube excites both a longitudinal wave and a shear wave, and a mixing ratio of the shear wave to the longitudinal wave is 10% or less.

Ultrasonic flowmeter

Provided is an ultrasonic flow sensor with improved practicality. An ultrasonic wave is transmitted and received by an ultrasonic element. A first flow rate value of a fluid in a pipe is calculated based on a propagation time difference of an ultrasonic signal, a measurement value corresponding to an ultrasonic velocity, and a parameter for identifying an inner diameter of the pipe. A second flow rate value of the fluid in the pipe is calculated based on a frequency shift of the ultrasonic signal and the parameter. The first flow rate value is calculated using a propagation time of the ultrasonic signal as the measurement value in accordance with a correspondence relationship among a distance of a path through which the ultrasonic wave propagates through the fluid in the pipe, a time for which the ultrasonic signal propagates in the path, and the ultrasonic velocity.

Ultrasonic flow sensor

Recording a history related to an operation of a safety program contributes to a determination of a cause of a false OFF signal. A safety controller acquires, from at least one safety input device or safety sensor, extra information that is not used for obtaining an output signal and records an input signal and an output signal together with the extra information as history information at predetermined recording intervals.

Safety controller and history display device

Growing community of inventors

Osaka, Japan

Ryuma Miyake