| 摘要 |
Apparatus 1 for detecting a change of flow rate of a fluid being pumped through a pipe 2, the apparatus 1 comprises a cylindrical chamber 4, a fluid sensor 6 disposed on the side of the chamber 4, alarm means 8 and a vent valve 10 located at a distal enclosed end of the chamber 4. The chamber 4 extends upwardly from the pipe 2 and is formed with a port 4 at the lowermost end of the chamber 4. The lower end of the chamber 4 is formed with a port 7 that extends through the wall of the pipe 2 such that the inner region of the chamber 4 is in fluid communication with the pipe 2 via the port 7. The fluid sensor 6 may be a solid state liquid level switch such as an optical liquid level switch. It will be appreciated that other types of fluid level sensors may be used. The fluid sensor 6 is in communication with the alarm means.
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