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Induction Proximity sensor issue

Discussion in 'Sensors and Actuators' started by naeemidrees, Jan 17, 2020.

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  1. naeemidrees

    naeemidrees

    8
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    Jan 17, 2020
    Hi,

    I am using induction proximity sensor in my circuit. Some time specially in winter sensor do malfunction. Means sensor randomly trigged. I am use NPN type sensor.

    Please help me.
     
  2. bertus

    bertus Moderator

    744
    263
    Nov 8, 2019
    Hello,

    Do you have a datasheet of the sensor to post?
    That way we can see the properties of the sensor.

    Bertus
     
  3. Minder

    Minder

    2,965
    626
    Apr 24, 2015
    What would the typical 'winter' temperature experienced by the sensor?
    M.
     
  4. naeemidrees

    naeemidrees

    8
    0
    Jan 17, 2020
    Data sheet Attached
     

    Attached Files:

  5. naeemidrees

    naeemidrees

    8
    0
    Jan 17, 2020
    In my country min temperature will be 5C but with dry.
     
  6. naeemidrees

    naeemidrees

    8
    0
    Jan 17, 2020
    I am using Atmega32 uc.
     
  7. bertus

    bertus Moderator

    744
    263
    Nov 8, 2019
    Specifications (cont.)
    Ambient temperature
    Operating : -25° to +70°C (-13° to +158°F)
    Storage : -30° to +80°C (-22° to +176°F)

    What is the temperature in winter?

    Do you have a complete schematic to share?

    Bertus
     
    Last edited: Jan 17, 2020
  8. Minder

    Minder

    2,965
    626
    Apr 24, 2015
    What form does the 'flag' take that triggers the Prox?
    What is the nature of the input, any opto etc?
    M.
     
    bertus likes this.
  9. naeemidrees

    naeemidrees

    8
    0
    Jan 17, 2020
    I am using opto PC817
     
    Last edited: Jan 17, 2020
  10. naeemidrees

    naeemidrees

    8
    0
    Jan 17, 2020
    test.png
     
  11. bertus

    bertus Moderator

    744
    263
    Nov 8, 2019
    Hello,

    I assume you are using a single 24 Volts power supply.
    The schematic suggests a dual 24 volts power supply, that would give 48 Volts on the sensor.
    The current through the led of the 817 will be about (24 -1.2) V / 5600 Ohms = 4 mA.
    Perhaps lowering the resistor value may give a more stable result.
    Try a resistor of 2200 Ohms in stead of the 5600 Ohms.
    Wich version of the PC817 are you using?
    There are 4 different sensitivity ranges.

    Bertus
     

    Attached Files:

  12. naeemidrees

    naeemidrees

    8
    0
    Jan 17, 2020
    I am using PC817 - 1 Channel type.
    This circuit drive two 24v solenoid. Mean noise environment.
    1.png
     
  13. naeemidrees

    naeemidrees

    8
    0
    Jan 17, 2020
    I am waiting of ur reply.
     
  14. bertus

    bertus Moderator

    744
    263
    Nov 8, 2019
    Hello,

    As I asked before, wich version of the PC817 are you using:

    PC817_A-D.png

    Also did you try a different resistor for the IR led of the PC817?
    Also what is the value of R5 in your schematic (the collector resistor of the opto)?

    Bertus
     
    Last edited: Jan 20, 2020
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