How to measure diesel tank level by pressure sensor, tank area and diesel paramenters

Discussion in 'Physics' started by esm., Mar 6, 2012.

  1. esm.

    Thread Starter Member

    Jan 20, 2012
    30
    0
    Hi.

    I have two diesel tanks here, used both in trucks and buses, they have around 250 liters of diesel when full filled (250 liters capacity). They have retangular format.

    I want to make an electronic measurement to them, of how many liters of diesel is present inside them, using these parameters:

    - Pressure measure (in PSI), obtained from an electronic sensor placed at the internal bottom of theses tanks.
    - Tank base area (if really needed to use it in the equation)
    - Data from the diesel (density and other necessary paramenters)

    The diesel tanks have these dimensions:

    Base dimensions: 125cm x 60cm
    Height: 40cm
    OBS: 1cm (centimeter) = 2.54 inches



    All I need to know is what would be the aproximate pressure measurement given by the sensor, in PSI (pound per inch) [the measurement unit may be other, I could convert between them], when the tank is nearly filled and nearly empty. I am stuck on this doubt because the selection of a electronic pressure sensor (dedicated IC) will be based on its pressure measurement range (Ex: 3 to 50 PSI, or Ex 10 to 150 PSI, or Ex 0 to 1.5PSI).

    EXAMPLE:
    What would be the approximate pressure measure when the tank is nearly filled?
    What would be the approximate pressure measure when the tank is nearly empty?


    Example os pressure sensors:

    1) BMP085 from Bosch -> range from 4.35 to 15.95 PSI - http://search.digikey.com/us/en/prod...5-6-ND/1987016

    2) MPX2202 Series from Motorola -> range from 0 to 29 PSI - http://search.digikey.com/us/en/prod...02AS-ND/420527
    c
    3) MPXV5010 Series from Motorola -> range from 0 to 1.45PSI - http://search.digikey.com/us/en/prod...GC7U-ND/412949

    4) MPX5100 Series From Motorola -> range from 0 to 14.5 PSI - http://search.digikey.com/us/en/prod...00GP-ND/464061

    There are many ICs models available with different measurement ranges.
    All I need to know is what is the aproximate pressure present at them bottom of the tank when it is 100% filled and nearly empty. The tank has 250 liters capacity and retangular format. Base dimensions of 125cm x 60cm and height of 40cm.

    I am looking for this range of pressure values, in any measurement unit, PSI, KpA, mbar, atm, etc

    Somebody may help about this question?
    Some better ideias to measure diesel level (in % or in liters directly) in the tanks? I don't want to use a capacitite or ultrasonic transducer method to measure the levels.

    Thanks in advance.
     
    Last edited: Mar 6, 2012
  2. nerdegutta

    Moderator

    Dec 15, 2009
    2,517
    785
    I couldn't get the links to work, you'd better check them.
     
  3. esm.

    Thread Starter Member

    Jan 20, 2012
    30
    0
    Example os pressure sensors:

    1) BMP085 from Bosch -> range from 4.35 to 15.95 PSI - http://search.digikey.com/us/en/products/BMP085/828-1005-6-ND/1987016

    2) MPX2202 Series from Motorola -> range from 0 to 29 PSI - http://search.digikey.com/us/en/products/MPXM2202AS/MPXM2202AS-ND/420527
    c
    3) MPXV5010 Series from Motorola -> range from 0 to 1.45PSI - http://search.digikey.com/us/en/products/MPXV5010GC7U/MPXV5010GC7U-ND/412949

    4) MPX5100 Series From Motorola -> range from 0 to 14.5 PSI - http://search.digikey.com/us/en/products/MPX5100GP/MPX5100GP-ND/464061
     
  4. Eskelvar

    New Member

    Mar 4, 2012
    4
    0
    esm.
    Please note: 1 cm = .3937 in and 1 in = 2.54 cm
    assuming the tanks are square (cubic) 18307.12 cubic inches in volume
    Regards...
     
    Last edited: Mar 8, 2012
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