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LM35: 温度センサー出力が通常の5倍程度になる

user4427847
Prodigy 50 points
Part Number: LM35

LM35AHを生産ラインの装置に使用してます
装置のモータが動作中にLM35AHを実装している
ユニットの金属箇所が装置の金属箇所に接触すると
温度センサーの出力が5倍程度大きくなります
TO-46パッケージで樹脂タイプの製品はございますか
無いのであれば、対策をご教授ください
LM35AHの出力はオペアンプにて増幅してます
増幅抵抗はボリュームで調整可です
よろしくお願いいたします


  • 0
    TI__Guru* 91086 points

    Dear Kido - 

    Thanks for the post and welcome to E2E. If possible, in the future, please post in English.

    For your inquiry - 

    The case of that package variant is connected to GND, so the metal it is making contact with must be at a different potential. 

    Please see or use the LP package if plastic encapsulated version works better for your application. 

  • 0 in reply to Josh Wyatt
    Prodigy 50 points

    LM35AH is used for production line equipment
    If the metal part of the unit where the LM35AH is mounted touches the metal part of the device while the motor of the device is operating, the output of the temperature sensor will increase about 5 times.
    Do you have resin type products for TO-46 package?
    If not, please teach me how to do it
    The output of LM35AH is amplified by an operational amplifier.
    Amplification resistance is adjustable with volume
    Thank you

  • 0 in reply to user4427847
    TI__Guru* 91086 points

    Yes, that is more or less what I translated and answered, above, thanks!