| 摘要 |
Alarm system for temperature supervision for a refrigerated compartment comprising sealed container (2) in said compartment which is filled with a substance with a solidifying/melting temperature which is close to the required alarm temperature and with a phase transformation between liquid and solid state which involves a volume change. The container (2) has a, at least, partly resiliently, deformable wall and an end section (2b) of the container has a varying position depending on the existing volume of the substance in the container. This end section (2b) is arranged to activate an electric contact (3) to activate an alarm device (2, 6), when the proportion of liquid phase in the substance in the container (2) exceeds a predetermined value. |
