Re-Calibrating Water Tank

Discussion in 'Bailey Motorhomes' started by Targetpaster, Apr 7, 2016.

  1. Targetpaster

    Targetpaster Funster

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    Hi Guys. Anybody any ideas on how to recalibrate water tank sensor. Right nuisance as sensors are making water pump kick in for a couple of turns every 10 secs!! Also after filling completely and then just one bowl of water the level shows at 85%. Clearly not right
     
  2. Jim

    Jim Ringleader

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    I doubt it is the sensor that it making your pump kick in, rather that will be a leak or your low point water drains are open or your water heater dump valve is open.
     
  3. mike mcglynn

    mike mcglynn Funster Life Member

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    Hi,Targetpaster I would check out all your plumbing connections as you may have slight leak, before fiddling with sensor.
     
  4. Targetpaster

    Targetpaster Funster

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    Thanks for all your tips so far. Checked everywhere, no leaks. Def a problem because when I mentioned the 10 sec thing you can literally set your watch with it! M\H only 4 months old so back to dealer on way home for a bit of a gripe as my Alde 3020 has a problem as well.
     
  5. scotjimland

    scotjimland Funster Life Member

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    have you checked the shower head.. and all other taps ?

    a drip every few secs will be enough drop in pressure for the pump to start..

    pump starting has nothing to do with the water tank level sensor ..
     
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  6. NickNic

    NickNic Funster Life Member

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    The 10 second thing is the pump keeping your system pressurised so it's definitely losing pressure somewhere. Could be something to do with the boiler, it could be a very slow weep or drip from a tap or a joint somewhere, it could be lots of things but there will be water escaping somewhere.

    Your other point, about the display of the tank water level not being accurate. That's a well known issue - the sensors are never accurate. There's pretty much nothing you can do about it, even if you replaced the sensor there's nothing to say it would be any better. You need to use the level shown on the display as a very rough guide, not expect it to be gospel truth.

    We can have about three showers after ours is warning and beeping that it's empty (y)
     
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  7. WillH

    WillH Funster

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    You've a little leak. Turn the tank sensor off, it is impossible for them to work accurately.
     
  8. scotjimland

    scotjimland Funster Life Member

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    depends on type of sensor..

    the rod system as fitted to Hymers are reliable and accurate .. nothing to go wrong.. a just four s/s rods that work by conduction..
    level indication.. zero 25% 50% 75% 100% .. same on waste tank.

    the ones with a float and variable resistor are less reliable..
     
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  9. Targetpaster

    Targetpaster Funster

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    Did all that. Van is so new we've not even used our shower yet! As I say thanks for all the tips which will be very useful in future but I think the sale of goods act may well kick in at the moment. Wanted to try a few fixes myself but 'higher authority' got the hump and said "back to dealer"
     
  10. NickNic

    NickNic Funster Life Member

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    Just a thought on the pump. Have you filled the system, both hot and cold sides, properly - i.e. made sure water is flowing steadily from all the taps and the shower from both the hot and cold taps?

    If there's any air in the system gradually working it's way out that could also explain the pressure dropping.
     
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  11. tonyidle

    tonyidle Funster

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    I'd go for a leaky valve on the pump or, if part of the pump, the pressure switch. The pressure in the system drops as water is forced back to the tank.
     
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  12. WillH

    WillH Funster

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    Look at the shape of your tank. Most are rather convoluted to fit around and over chassis rails. The type of sensor used on vans can only work, accurately, if the tank is of regular cross-section. Besides, as you get to know your van you get an idea of how much water you use and how often to top up. My gauge reads empty most of the time as there is never more than 30 ltrs. in it, the waste rarely reads more than 1/4.
     
  13. TheCaller

    TheCaller Funster

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    I'm with Tony. If you can't find any leaks (& they can be difficult to find - could be an underfloor junction somewhere :(), then the likely culprit is the non-return valve allowing water to flow back into the tank. This is usually part of the pump, or a separate item right next to the pump.

    If you tell us the make & model, someone may know what is fitted.

    On some systems, the water pressure is adjustable & if set too high, it can 'hunt' in the way you describe. I had a similar problem on an Abbey caravan, but that would be a 30 year old system if it was still on the road today. Cured it by dropping the pressure a bit.
     
  14. NickNic

    NickNic Funster Life Member

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    So if you have say 85% left does it tell you that you have 100% or 75%?

    To me that's no more accurate than any of the others.
     
  15. scotjimland

    scotjimland Funster Life Member

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    It is a digital instrument.. not analog .. it shows steps.. not exact level.. correct, it doesn't show small incremental steps.. but it doesn't need to..

    Repeatability of a level instrument ( any measuring instrument ) is more important than an exact measurement to the nth degree ..

    If you need or want exact level display you would need to employ a different type of instrument.. for example.. an ultrasonic level transmitter.. but for purpose of knowing how much water you have left this would be an expensive solution.. and simply overkill

    Rod level measurement and control is widely used in the food, chemical and petrochemical industry as it is

    a) relatively cheap
    b) reliable
    c) cheap and simple to maintain
    e) easy to calibrate
    f) is consistent with a standard, rule, or model, ie. accurate

    bottom line.. it works, a perfect example of the KISS principal
     
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  16. NickNic

    NickNic Funster Life Member

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    I'm sure you're right. My point was that it's only approximately accurate the same as the other type fitted in other motorhomes is only approximately accurate.
     
  17. pappajohn

    pappajohn Funster Life Member

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    Sorry to say, the pressure is not adjustable, its pre-set at the factory and is defined by the pumps combined cylinder volume, piston stroke and the motors power.
    What is adjustable is the cut off pressure which relies on the back pressure in the pipes and pump once the flow is stopped.
    By adjusting the screw the pump can be made to switch off with a lower or higher STATIC pressure.
    Too low and the pump may not work at all because of the pipework and taps resistance to allow water to flow freely.....too high and the pump will never get to the pressure needed to activate the microswitch and the pump will run continuously.
     
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  18. scotjimland

    scotjimland Funster Life Member

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    other types fitted such as floats with variable resistors are cheap and notoriously unreliable.. the ones most often complained about being inaccurate or simply useless..they tell lies.. not fit for purpose..

    rod level is reliable and does the job required.. ie let's you know when to fill up...

    If it shows say 50% I know I have less than 75% but more than 50% .. so no need to fill .. just yet

    when it shows 0% I have less than 25% left .. .. time to fill up.. that's all you need to know..
     
  19. TheCaller

    TheCaller Funster

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    Indeed. That's why I said water pressure rather than pump pressure.

    ... and of course there is also the possibility that at a slightly lower water pressure the non-return valve won't leak back. But if the pump is coming on every 10 seconds I suspect that's being over-optimistic.
     
  20. pappajohn

    pappajohn Funster Life Member

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    My apologies, I assumed you meant to pump water at a higher or lower volume and pressure.
    Its a common mistake some people make thinking that adjusting the screw to raise the pressure will make it flow like a fire hose.
     
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