Sender and gauge compatibility

Discussion in 'General Electronics Chat' started by Jonathon Morris, Oct 4, 2015.

  1. Jonathon Morris

    Thread Starter New Member

    Oct 4, 2015
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  2. BillB3857

    Senior Member

    Feb 28, 2009
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    Can you give a better explanation for the gauge reading 33-240? Does that mean a series resistance of 33 ohms for Empty and series resistance of 240 ohms for full reading? At what voltage?
     
  3. Jonathon Morris

    Thread Starter New Member

    Oct 4, 2015
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    There are just 2 wires, no supplied voltage for sender but gauge runs on 10-16 volts. 0-700 700 empty on sender, 33-240 240 empty on gauge
     
  4. Brownout

    Well-Known Member

    Jan 10, 2012
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    I'm more confused than before. Your guage reads 33 - 240...what? Please provides all the details. Most of us won't guess and won't hang around for the details to drip out.
     
  5. wayneh

    Expert

    Sep 9, 2010
    12,141
    3,054
    A traditional fuel gauge sender is a simple variable resistor. It's a fine wire wound around a support, with a spring-held wiper that moves with the float. Depending where the wiper touches the wire windings, indicating the float position, a varied resistance is seen at the output.

    I have no idea what you are talking about with your gauge.
     
  6. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
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    How many terminals on the gauge? Two or Three?

    If two, is is wired like this?

    FG.gif

    Be advised that it is really hard to make this work. You really need to get a sender matched to the gauge...
     
  7. Brownout

    Well-Known Member

    Jan 10, 2012
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    If the guage is looking for 33 - 240 ohms and say, 14V, or eqivalently 424 - 58mA, I suppose you could use a voltage/current converter calibrated to those current outputs.

    PS: The thread in the link uses a voltage scaler, so I'mclearly out of my league here.
     
    Last edited: Oct 5, 2015
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