| 摘要 |
A control device counts the duration of escaping gas or liquid to the atmosphere. The device detects the flow, speed, volume or weight of the escaping fluid. Preferred Features: The device may close an electric valve after a preset duration. The device may be reset automatically or manually after it has operated. The device has a manual by-pass. The device is adjacent or located away from the fluid passage. The counter can operate mechanically, electronically, electro-mechanically, inductively, by radar, vibration, infra red, ultrasound, high frequency, etc. |
