CBE panel and tank probes

Discussion in 'Tech/Mech General' started by sallylillian, Sep 4, 2015.

  1. sallylillian

    sallylillian Funster Life Member

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    I have now had time to experience the tank probes that feed tank data to the CBE panel. They are inaccurate so for example the fresh water read 100% when in reality it is 75%. The black tank is crude at 3 options, 0%, 30% 70% Full! On my RV I had tank senders on the outside of the tank and they gave 5% steps. I was wondering if anyone had fitted alternatives other than CBE senders?
     
  2. maxi77

    maxi77 Funster

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    You can get tank gauges from boat chandlers which drive standard 2 inch automotive gauges which give continuous readings from empty to full.
     
  3. tonyidle

    tonyidle Funster

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    The 'sensor' comprises 5 stainless rods. The longest is the common and should be slightly longer than the rest. The remaining 4 in order of longest to shortest are 1/4, 1/2, 3/4, and full. The lights or (pointer on the meter) are lit/moved when the water or waste bridges each of the sensing rods to the common rod. I have made mine as accurate as possible by cutting or extending the sensor rods. In the case of the fault mentioned by the OP shortening the shortest rod so that water doesn't reach it until the tank is almost full will solve the problem. Cutting the rods is easy but extending any that are too short is more complicated - the stainless extension needs to be welded to the existing rod. I did this by having any short rods extended more than necessary & trimming them once I'd done so. Stainless welding rod works as the extension and any welding shop will have both material and skills to do the job (which takes around 10 minutes).
     
  4. sallylillian

    sallylillian Funster Life Member

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    Thanks Tony I will have a look inside the tank. What are the chances of a sensor that fixes to the outside being compatible?
     
  5. tonyidle

    tonyidle Funster

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    Not very likely unfortunately. The water effectively connects the sensor rods in order to the common (longest) rod. Physically connecting them has the same effect so any alternative sensor would need to do the same.
     
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