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MagnetoPot: Liquid Level Contactless Sensor

Replacement: None. We are no longer carrying this sensor in our catalog. This page is for reference only.

The MagnetoPot is a contactless linear potentiometer used for liquid level and other harsh applications. This innovative sensor allows designers to retroactively assemble the sensor on the outside of pneumatic and hydraulic cylinders, which connects with the internal magnet of the cylinder. This allows the cylinder to produce linear output and at the same time avoid the internal liquids and grease common to cylinders. Alternatively, the Magnetopot can be affixed to the outside of a liquid tank or directly next to the motion device, creating an almost imperceptible drag and giving linear output for the complete motion without contact. Cycle testing has rated the MagnetoPot over 1 million cycles, and up to 85C. It is elegant but robust, a contactless design which allows for space sensitive requirements, penetration of walls, and longevity in action.

The MagnetoPot uses an internal and external magnet to make pressure on the pot, indicating the position. This unique setup allows linear position in very harsh environments such as hydraulic actuators and liquid environments. Because there is an embedded magnet, this pot is a bit thicker than the other membrane potentiometers. The MagnetoPot comes with a magnet internally, but you will need to provide your own magnet externally.

Unit comes with adhesive backing. Connector is 0.1" spaced and bread board friendly.


  • Resistance: 10kOhm
  • Resistance Tolerance: +/- 20%
  • Linearity: +/-5%
  • Life cycle: >1 million
  • Height: <= 0.40mm
  • Temperature: -40C to +50C
  • IP Rating: IP66
  • Thickness is 0.096" or 2.44mm


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • There's a really great video on the manufacturer's website:
    It shows how to use the MagnetoPot with linear servos or measuring fluid levels.
    I didn't quite get how to configure this (since the datasheet is sparse), but the video pretty much explains it all.

  • I'm looking for this kind of hardware rated for 190 degrees F. does it exist?

  • Is there any clearer diagram or even better fritzing.org drawing available on how to connect the MagnetoPot correct to V+ (red), GND (black) and collector (yellow) (e.g. A0 on Arduino Board)? E.g. there is a triangle and a B available direct on the sensor which might be used as reference points on where to connect? See e.g.: http://ropeandpulley.com/blog/wp-content/uploads/2011/12/theMaids-Drawer-Sensors-2011-12-09_bb.pdf Note: Not sure if this is correct?

  • Is there any guidance on the resolution of this sensor? In the data sheet there is this:"Depends on the exterior magnet strength and distance to the MagnetoPot." But this does not really help me. What might the resolution be with a very strong magnet being held up to the sensor? Or maybe something like this held a few cms away? Could someone who has bought this unit post roughly what their setup is and what kind of resolution they have achieved?

  • When might this be back in stock?

  • When might this be back in stock?

  • When might this be back in stock?

  • When might this be back in stock?

  • Does anyone know if the orientation of the magnet to the strip makes any difference? What I am looking to find out is whether I can use a magnet which might be anywhere in relation to the strip (front, side, back).

  • Does anyone know the length of this sensor? The manufacturer makes a number of different lengths (up to 1 meter), but I don't see which length is being sold here.
    The datasheet and dimension drawings do not indicate a length either.

    • Check the product photos - SFE puts rulers into the dead-on shots - should be able to tell you the length.

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