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LMT01-Q1: Mounting

Janie Harari
Prodigy 20 points
Part Number: LMT01-Q1
Other Parts Discussed in Thread: LMT01

Hi,

On the datasheet it states: "Alternatively, the LMT01-Q1 can be mounted inside a sealed-end metal tube, and then can be dipped into a bath" Could you please give me a bit more information about this setup? Does it matter if the sides of the sensor are in contact with the metal tube? What should the opening for the leads look like?

Thank you,
Janie

  • 0
    TI__Mastermind 28070 points

    Hi Janie,

    The LMT01 is still a contact sensor, so for best results it should be thermally connected to the sides of the probe tube. This can be done directly or with a thermal compound. The leaded opening should be ideally sealed to be at least liquid tight. A probe manufacturer would better be able to guide you on that, as they will have different recommendations/capabilities. 

    Let me know if you have any other questions. 

    Best Regards,
    Brandon Fisher

  • 0 in reply to Brandon Fisher94
    Prodigy 20 points

    Hi Brandon,

    Thank you for your response.  In our application we are trying to measure a surface temperature by using a single face of this sensor (the face furthest away from the leads).  The sensor is surrounded on all other sides with thermal grease. How is the sensor measuring the temperature around it if the temperature is different on all sides?

    Do you have a probe manufacturing that you would be able to recommend to me about interfacing with this sensor in particular?

    Thank you,

    Janie

  • 0 in reply to Janie Harari
    TI__Mastermind 28070 points

    Hi Janie,

    That use case is a bit different, the probe recommendations I gave are for dipping into liquid baths or otherwise thermally uniform environments. If you want to sense temperature from one side in particular, you should thermally connect the sensor as much as possible to the side you want to sense from (thermal grease/compound only on one side). You may also consider having the contact side made from a thermally conductive material such as copper or stainless steel, and the other sides of the probe made from a more insulating material such as plastic. 

    You could also pursue a ring lug solution like what they sometimes use for NTC thermistors (examples here). In that case you can bolt the ring-lug to the surface you want to read temperature from.

    Unfortunately I cannot recommend a probe supplier for your application. TI does not produce or manufacture these probes, and we no longer build these probes for evaluation purposes. 

    Keep in mind that you can also just use the LMT01 as normal on board temperature sensor without a probe enclosure. The datasheet simply specifies that the LMT01 can be used that way for applications that already require a probe based solution. 

    Best Regards,
    Brandon Fisher