Yokogawa Electric Corporation

Yasumi Koike

Ikuhiko Ishikawa

Toru Shimura

A field device () includes an electronic circuit () connected to at least one of a sensor () and an actuator, a bimetal temperature switch () connected to a power source () in series with the electronic circuit () and configured to turn on when rising to a first temperature, a heating element () connectable to the power source () in parallel with the electronic circuit () and the temperature switch (), and a housing () configured to house the electronic circuit (), the temperature switch (), and the heating element ().

Field device capable of operating in extremely low-temperature environment

An electromagnetic flowmeter for giving a magnetic field to a measurement fluid, detecting an electric signal occurring in the measurement fluid according to the magnetic field, and computing a flow quantity value based on the electric signal includes a zero point measurement section for measuring a zero point of the measurement fluid; a storage section for storing the measured zero point measurement value; a determination section for determining whether or not the difference between the preceding zero point measurement value stored in the storage section and the present zero point measurement value is beyond a predetermined value range; and at least either a transmission section for transmitting the determination result or a display section for displaying the determination result when the determination section determines that the difference is beyond the predetermined value range.

Electromagnetic flowmeter and zero point measurement method thereof

A field equipment includes: a signal processing section; a first calculation control section for generating a first control signal which controls a start of a signal processing of the signal processing section; first and second insulating sections coupled to the first calculation control section; and a second calculation control section coupled to the first and second insulating sections and the signal processing section, the second calculation control section receiving the first control signal and then transmitting a second control signal corresponding to the first control signal to the signal processing section. The signal processing section generates a processed signal based on the second control signal. The second calculation control section receives the processed signal, then transmits data related to the first signal to the first calculation control section via the second insulating section, and then shifts to a low power consumption mode.

Growing community of inventors

Musashino, Japan

Yasumi Koike