**Using a pressure measurement instrument to measure fuel level is very common, however most are scaled in bar or psi pressure ranges, and if they do happen to be scaled in level units, they are typically water level based, such as mH2O or ftH2O.**

There are many different grades of liquid fuels which vary in density, plus changes in tank temperature will affect the density of one fuel type. So it is important to carefully consider the pressure range required to ensure that the level being measured never exceeds the operating range of the measurement device.

**Tank level pressure measurement products**

- Submersible rainwater tank level sensor for measuring 3.5m depth
- 20 foot deep detention water tank level sensor with 4 to 20 mA output
- Hydrostatic level sensor and indicator for frothing oil tank
- Elevated freshwater tank level 30 psig range 0-5Vdc out pressure sensor

The conditions which will produce the maximum hydrostatic pressure, are the lowest tank temperature and the maximum tank level. If you know the density of the fuel at the lowest tank temperature and the maximum possible fuel height in the tank, then you can calculate the pressure range needed to ensure the instrument will never go over-range.

For an example, let’s say you have a Kerosene fuel tank that is 1,385 mm deep, with a maximum specific gravity of 0.82 corresponding to the lowest tank temperature of 15.6 degC. If you convert this to a hydrostatic pressure, it will come out as 0.1114 bar, 1135.7 mmH2O or 3.726 ftH2O pressure.

**Tank level pressure measurement products**

- 5 kPa g range 0-5 Vdc output fuel oil pressure sensor for liquid level measuring use
- Dairy farm 6m high milk storage vat 4-20mA level transmitter
- 3m range 4-20mA output submersible seawater dewatering tank level sensor
- 4000mm range 0-5Vdc output diesel tank level sensor for external fitting

## Related Help Guides

- Measuring the volume of liquid in a horizontal cylinder tank
- Difference between vented and non-vented water level measurement
- Measuring liquid level in a tank using a dp sensor
- Determining water tank volume using hydrostatic pressure
- How do you measure the volume of a liquid using pressure

## Related Technical Terms

- cmH2O – Centimetres of Water Column at 4 deg C Pressure Unit
- ftH2O – Feet of Water Column at 4 deg C Pressure Unit
- mH2O – Metres of Water Gauge at 4 deg C Pressure Unit
- mmH2O – Millimetres of Water Column at 4 deg C Pressure Unit
- Specific Gravity

## Related Online Tools

- Fluid Depth, Density, Gravity, and Pressure Calculator
- Pressure to Liquid Level Calculator
- Liquid Level to Hydrostatic Pressure Calculator