Abstract: A fluid control device 10 comprises a valve device V2 including actuators 22 and 24 for opening and closing a flow path and adjusting a flow rate of a fluid flowing through the flow path, a pressure sensor PT provided upstream of the valve device V2, and a control circuit 12 connected to the valve device V2 and the pressure sensor PT, and the control circuit 12 controls an operation of the actuator based on a pressure measured by the pressure sensor PT and a reference pressure drop curve, while the upstream side of the fluid control device is closed and the valve device is opened using the actuators.

Abstract: An electronic timer having two electromagnetic relays is disclosed. The two electromagnetic relays are mounted on an insulating base plate. The electronic timer further comprises a delay circuit. At least one of the two electromagnetic relays is connected to an external power supply through the delay circuit. These two electromagnetic relays may be connected in such a manner that when connected with an external power supply, one of them is operated instantaneously while the other is actuated after a delay time, or in such a manner that both of them are simultaneously operated after a predetermined delay time, or in such a manner that they are operated after different delay times.