Read latching solonoid valve position

Discussion in 'General Electronics Chat' started by fsoender, Aug 18, 2016.

  1. fsoender

    Thread Starter New Member

    Dec 10, 2015
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    Hi,

    I got an latching solenoid that I wish I could read the 2 positions of the valve. I tried Hall sensor, but the housing is to thick to read anything.
    I was thinking, would reading the coil do the trick, when its latched, I could resonance it some how and see if its latched or not?

    Any suggestions?
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,773
    1,103
    That should work if the coil inductance varies according to the armature position.. Can you post a link to the solenoid datasheet?
    Is there space for a simple microswitch?
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
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    What is the device that you are using to input the Read posn to?
    When it is latched or unlatched there is no power to it so it probably will come down to a physical position of the plunger if it is required to be read at any other time.
    Max.
     
  4. fsoender

    Thread Starter New Member

    Dec 10, 2015
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  5. fsoender

    Thread Starter New Member

    Dec 10, 2015
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    It will be on an microcontroller.
    Yes its just an pulse, but wont you be able to "test" the position after its changed position by measuring the resonance?
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Small inline pressure switch on the output side?
    Max.
     
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  7. fsoender

    Thread Starter New Member

    Dec 10, 2015
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    I wish, no room
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
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    You could record the last position via polarity on activation, but not after, are you anticipating it drop out of its own accord?
    Or is it last state in case of a power outage?
    Max.
     
  9. fsoender

    Thread Starter New Member

    Dec 10, 2015
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    I do record it, but I want to have a better feedback due to vibration or shock that can potentially unlatch it.
    I want to keep recording the position...
     
  10. MaxHeadRoom

    Expert

    Jul 18, 2013
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    No way of cushioning it and if necessary and couple with flex pipe?
    Max.
     
  11. MaxHeadRoom

    Expert

    Jul 18, 2013
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    If you can remover the cover and see where the magnetic armature ends up, you could insert a Honeywell SS400 mini hall effect device which has a TO92 case so very small.
    They have Unipolar, bipolar and latched variety.
    Max.
     
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