| 摘要 |
<p>A temperature detector 10 comprises a first tube 21 defining a first chamber 24, and a second tube 22 defining a second chamber 23. The second chamber 23 contains a solid material 14 that evolves gas upon heating, while the first chamber 24 contains a lesser amount of, or no, such material. The first and second tubes 21, 22 may be in fluid communication with a single pressure switch (40,Fig.4a). The first and second tubes 21,22 may extend parallel to one another, or the second tube 22, may be located within the first tube 21 (see Fig.3a). The second tube 22 may contain a gas at a lower pressure than the first tube 21. The pressure switch (40,Fig.4a) may be configured to provide a first alarm indicative of a first pressure increase in the first tube 21 at a first temperature, and a second alarm indicative of a second pressure increase in the second tube 22 at a second higher temperature. The first alarm may indicate an overheat condition whilst the second alarm may indicate a fire condition. An integrity sensor may be provided in fluid communication with the first chamber to detect a drop in pressure of the pressurized gas.</p> |
