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Is hand sanitizer electrically conductive ?

Discussion in 'General Electronics Discussion' started by bobdxcool, May 23, 2020.

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  1. bobdxcool

    bobdxcool

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    Mar 9, 2012
  2. Audioguru

    Audioguru

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    Circuits that are used to detect when the water level is low for plants use AC, not DC. DC causes plating and corrosion of the probes.
     
    narkeleptk and davenn like this.
  3. Bluejets

    Bluejets

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    Oct 5, 2014
    A capacitive sensor may do the job.

    I have read where it is necessary to seal the edge of the sensor board with a bit of epoxy though, as the manufacturer missed that bit.

    https://www.ebay.com.au/itm/Corrosi...653096?hash=item3428040b68:g:Si4AAOSwj3NevI0V

    Example video with Arduino code below.....


     

    Attached Files:

    Last edited: May 24, 2020
  4. KMoffett

    KMoffett

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    Jan 21, 2009
    Per Audioguru's advice, this a version of a water level indicator circuit that I've used several times. Take the 4093's outputs to your Arduino's inputs. But don't know about sanitizers conductivity. WaterLevelX6A.gif
     
  5. Alec_t

    Alec_t

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    Jul 7, 2015
    It depends on the ingredients in the product. A bottle I have lists the ingredients as "Alcohol denat, aqua, glycerin, propylene glycol, triethanolamine, carbomer, aloe barbadensis gel, tocopheryl acetate, parfum". My multimeter with probes ~ 1cm apart in a small puddle of it shows a resistance of about 0.5 megohms.
     
    Last edited: May 24, 2020
  6. Bluejets

    Bluejets

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    Oct 5, 2014
    Would it need to be conductive for a capacitive sensor...?
     
  7. KMoffett

    KMoffett

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    No. The dielectric is an insulator. Well, the two plates of a capacitor in this case case must be insulated. The dielectric constant of the electrode insulation and that of the liquid and air determine the capacitance sensed.
     
  8. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    AC is definitely preferred over DC.

    Regardless of AC or DC an electric current through a liquid can always lead to decomposition of the fluid contents. Some possible results are:
    • dangerous substances as a result of decomposition
    • loss of effectivity of the sanitizer (in this particular case) due to decomposition of its active ingredients

    I do recommend the capacitive solutins proposed.
    Or, if you need to sense only when the level falls below a certain threshold you may use a float lever with a switch attached. Or use the optical properties of the liquid and sense the level with an LED and a phototransistor.
     
  9. Alec_t

    Alec_t

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    Jul 7, 2015
    .... or just transfer the sanitizer to a glass container :).
     
    Harald Kapp likes this.
  10. KMoffett

    KMoffett

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    Jan 21, 2009
    To add to Alec_t's suggestion, post a photo of the tank you were planning to use?
     
    Last edited: May 25, 2020
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