water tank sender

Discussion in 'Tech/Mech General' started by mick noe, Feb 4, 2014.

  1. mick noe

    mick noe Funster

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    is there a way of calibrating the sender for the water tank mine reads 140l when only around half full.Think the tank is around 100l so must be wrong. Thought about fitting potentiometer in circuit but what size and would it work. May need a new sender or just live with it?
     
  2. pappajohn

    pappajohn Funster Life Member

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    im sure you could....but why bother.

    You know you are empty when the tap runs dry....then you need to go fill up.
    With a working gauge, when it shows empty you still need to go fill up.

    Plus, the gauge will still be variable as the hab battery voltage drops and rises under charging

    You could do the same thing by experimenting with differing value inline resistors but it still wont be linear...(empty 1/4 1/2 3/4 full) no matter how you do it.

    Just like a fuel gauge....they are only an inacurate indicator.
     
    Last edited: Feb 4, 2014
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  3. hilldweller

    hilldweller Funster Life Member

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    If it's a computerised LCD display there may well be a calibration setting to suit different tanks, problem is finding out the code to get access to it.
     
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  4. pappajohn

    pappajohn Funster Life Member

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    once again the technology to make our lives easier and more reliable actualy make things a lot more difficult.

    Simple mechanical technology will be sadly missed.
     
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  5. Taran_Las

    Taran_Las Funster

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    Mine's a pathological liar. I know salt isn't good for you but the readings given are best taken with some:Eek!:
     
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  6. Moodybrook

    Moodybrook Funster

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    Drill a hole near the bottom of the tank, fit a tap then from the tap fit a length of see through plastic pipe that is longer than the height of the tank tape the pipe up the side of the tank. Find a coloured plastic hollow bead that will float and fit inside the tubing, open the tap, fill the tank and the water will fill the tube and the bead will show you precisely how much is in the tank. Thimple
     
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  7. mick noe

    mick noe Funster

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    very true on our old van it was very easy to see tank level so just filled up to a small hump in the tank for traveling (about a day and a bit use) and fill to overflowing on arrival on site ...........simples:thumb:
     
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  8. pappajohn

    pappajohn Funster Life Member

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    thats more like it.....

    Simple mechanical technology is not dead....its alive and kicking. :thumb:
     
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  9. JeanLuc

    JeanLuc Funster

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    I'm not sure what system Rapido fit, but if the sender unit comprises a set of different length rods, it might be worth giving them a bit of a clean. I periodically get my hand in the empty tank and rub the rods with one of those green plastic pan scourers. This is even more important for the waste tank where the senders get covered in 'gunge'.
     
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  10. Moodybrook

    Moodybrook Funster

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    Of course if the tank is below the floor then you will have the fun of crawling underneath the van, torch in hand, to observe your dancing bead, what joys.
     
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  11. hilldweller

    hilldweller Funster Life Member

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    Funny you should say that, my thread today on A and N Caravans.

    Our water gauge was intermittent then non-existent. I found the old moving coil meter open circuit. A and N supplied one within 12 hours. So yes, a very easy repair but even old technology does fail.

    You are dead right, a multimeter and a soldering iron, pull off wire, measure, "ah open circuit".

    Other side of the coin, Joy is going spare with her later computerised display all grief and many ££££££ talked about.
     
  12. Johns_Cross_Motorhomes

    Johns_Cross_Motorhomes Trader - Motorhome & Accessory Sales

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    Joy needs some help as her supplying dealer is not being helpfull at all and as I understand it, she has only had the van four months and it was faulty when supplied

    Peter
     
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