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TMP117: Venturi application

Art Mecina
Genius 16655 points
Part Number: TMP117

Hello Guys,

Good day.

Our customer is planning to use the TMP117 in a spirometry medical device. Like a venturi application. They want to place this sensor in a flow of air with speeds up to 12 m/s. So the principles of heat transfer is air convection, will this work?

Referring to the attached image, can the sensor be located at either point 1 or 2, horizontal or vertical in the flow stream?

Thanks in advance!

Art

  • 0
    TI__Mastermind 43815 points

    Hi Art,

    I'm not familiar with this device or its intended purpose. Will a sensor protrusion alter the operation of the tube? Ideally, I would like to see the sensor stand off from the wall to make an air temperature measurement. I'm concerned that if the sensor is embedded in the wall of the tube, it will track the temperature of the tube better than it tracks the air temperature. There is nothing wrong with measuring temperature of air with our devices, but we must minimize other thermal paths or else suffer errors of some degree. It's possible I'm overstating the magnitude of such error for this design, but I simply don't know. 

    thanks,

    ren

  • 0 in reply to Ren Schackmann
    TI__Genius 16655 points

    Hello Ren,

    Thanks for looking into this. I might point the customer directly to this thread so that he would be able to explain his use case better.

    Best regards,

    Art

  • 0 in reply to Art Mecina
    Prodigy 40 points

    Hi  Ren

    Can we setup a zoom o, skype or even better a slack call. Where are you based and what date and time would work..I am in Dublin   Ireland

    The application is for a spiometer .  When a person blow into it we which to measure the profile of the breath using a pressure drop using bypass flow approach of the sensor.

    We can stand off the sensor ports from the wall  and the wall will be made from an abs or abs/polycarbonate blend  so we can add features  to minimise localised heating of the sensor body and the plastic we securit it.

    Anyway can we do a technical call

    My email address is  vincentlawlor@bluebridgetech.com

    00353872316952

  • 0 in reply to vincent lawlor
    Prodigy 40 points

    sorry i meant temperature 

  • 0 in reply to vincent lawlor
    TI__Mastermind 43815 points

    Hi Vincent,

    I would love for you to use our sensor, but I'm not sure we can provide any further technical assistance in this design. I would suggest that you build a prototype to see if it meets your needs. If you had data to share, a problem to troubleshoot, we could work through it and make suggestions.

    Let me know if you have other questions about our product.

    thanks,

    ren

  • 0 in reply to Ren Schackmann
    Prodigy 40 points

    Hi Ren

    Would it be possible to answer some of my question that i poster here  so at least i can get more conficence?

  • 0 in reply to vincent lawlor
    TI__Mastermind 43815 points

    Hi Vincent,

    What is your question? 

    thanks,

    ren

  • 0 in reply to Ren Schackmann
    Prodigy 40 points

    Hi  Ren

    We want to measure exhaled Breath in a  spirometer

    Flow   up to  12 liters per second  passing over the sensor surface

    So  will the TMP117 be ok for this application

    We are also concerned of the thermal pathway and how do we minimize this path, but still have appropriate electrical connectivity 

    regards

    Vincent

  • 0 in reply to vincent lawlor
    TI__Mastermind 43815 points

    Hi Vincent,

    TMP117 is our most accurate temperature sensor. Regarding it's suitability for spirometer, you'll have to do your own analysis and testing. 

    Regarding electrical connectivity, I would look into using a flex PCB.

    thanks,

    ren