Temperature Sensor Identification

Discussion in 'The Projects Forum' started by enggricha, Sep 2, 2014.

  1. enggricha

    Thread Starter Member

    May 17, 2014
    62
    1
    Please check the attached image. I am fairly confident this is a temperature sensor, given the application I found this in (peltier cooler). But I am not sure what kind of temperature sensor this is and how to read the marking on the same. I am sure you guys can help me figure this out.
     
  2. debe

    Well-Known Member

    Sep 21, 2010
    946
    184
    Looks like a 50deg C thermal fuse. Will go open circuit if it senses more than 50C.
     
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  3. enggricha

    Thread Starter Member

    May 17, 2014
    62
    1
    Thanks, now that I look up thermal fuse I see similar parts. But not sure why the original manufacturer had used a thermal fuse on the cool side of a peltier cooler !!
     
  4. ebeowulf17

    Active Member

    Aug 12, 2014
    678
    79
    It's been too long now for me to remember the details, but I used to work on little peltier milk coolers and a very common failure mode (something wrong with the power supply, but I don't remember what) led to extreme, rapid heating of what should've been the cool side. So the thermal fuse seems like a very good idea to me!
     
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  5. wayneh

    Expert

    Sep 9, 2010
    12,126
    3,048
    Failure to remove heat from the hot side will cause the cool side to get hot. Just a speculation. It may be less problematic to have the sensor on the cold side instead of the more-obvious hot side.
     
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  6. enggricha

    Thread Starter Member

    May 17, 2014
    62
    1
    Thanks for that... that infact makes sense now that I look at it from that perspective.
     
  7. #12

    Expert

    Nov 30, 2010
    16,298
    6,810
    I hadn't thought of that, but failure to dump heat from the hot side will make all of the Peltier go hot because it's all one piece. You only have to decide on what temperature to detect if you measure on the allegedly cold side.
     
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