Yokogawa Electric Corporation

Nobuhiro Kanatani

Hitoshi Saito

Takuya Nidaira

Takayuki Suzuki

A state detection apparatus includes a communication circuit that transmits information to an external apparatus, a control circuit that operates the communication circuit at a first timing, a battery that supplies electric power to the communication and control circuits, and a first explosion-proof barrier connected between a contact circuit and the control circuit. The control circuit applies a test signal, generated based on voltage from the battery, to the contact circuit at a second timing arriving at shorter intervals than the first timing, acquires a detection signal indicating current flow in the contact circuit due to test signal application, and regardless of the first timing, operates the communication circuit when the detection signal is acquired to transmit to the external apparatus that the state of a device connected to the contact circuit is abnormal.

State detection apparatus

Provided are an electrical device and a component for an electrical device that can efficiently suppress the occurrence of a short circuit between a housing and a circuit board. The electrical device includes a housing and a circuit board housed inside the housing. The housing includes a metallic main housing to be attached to an installation section and a sub-housing attached to the main housing. The main housing includes a main wall, extending along the circuit board with a gap between the main wall and the circuit board, and a board attachment portion having the circuit board attached thereto. An insulating plate having insulating properties is fixed to an inner surface of the main wall.

Electrical device and component for electrical device

The purpose of the present invention is to enable use of a solenoid-type electromagnetic valve () in a valve driving device () that performs wireless communication. A contact signal converter () that converts an on-off contact signal to a control signal for operating a solenoid-type electromagnetic valve () comprises an explosion protection barrier () which restricts the current of the control signal to be no more than a maximum current established for safety regarding solenoid-type electromagnetic valves (), and a group of batteries (), the number of which can ensure a voltage at which the voltage supplied via the explosion protection barrier () surpasses the operating voltage of the solenoid-type electromagnetic valve ().

Growing community of inventors

Musashino, Japan

Nobuhiro Kanatani