# 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

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.

Last edited: Mar 6, 2012
2. ### nerdegutta Moderator

Dec 15, 2009
2,674
918
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