Hydrostatic Pressure Calculator
Liquid Depth/Level to Hydrostatic Pressure
User Guide
The Hydrostatic Pressure Calculator and the conversion scale will convert any unit of fluid height or depth into the measured value of the hydrostatic head pressure. A list of converted values will be displayed above and below the entered liquid level.
Hydrostatic Pressure
Hydrostatic Pressure is the pressure exerted on a surface when an object is at rest or moving in a straight line at constant speed. The unit is: pa. Hydrostatic Pressure plus dynamic pressure equals full pressure.Definition of Hydrostatic Pressure: When the fluid is in equilibrium or relative equilibrium, the stress acting on the fluid is only normal stress, and no tangential stress, at this time, the negative normal stress on the surface of the fluid is hydrostatic pressure.
Hydrostatic Pressure Units
N : Newton, 1N=0.101097KgfPa : Pascal , Pa=N/m²
mmAq : Aq=Aqua (short for water column); mmAq is also known as mmH2O ; 1mmAq=1Kgm². atm : atmospheric pressure; one atmosphere equals 760mmHg at 0°C in the dry state;
atm : atmospheric pressure; one atm is equal to the pressure of 760 mmHg at 0°C in the dry state, because the weight of mercury is 13.5947 times that of water, so one atm is equal to the pressure of 10,332 mmH2O.
bar : 1 bar=100000Pa=0.1MPa
Working Principle of Hydrostatic Pressure Level Gauge
Based on the principle that the Hydrostatic Pressure of the measured liquid is proportional to the height of the liquid, the Hydrostatic Pressure is converted into an electrical signal by using the piezoresistive effect of diffusing silicon or ceramic sensitive elements. It is temperature compensated and linearly corrected. It is converted into a 4-20mA DC standard current signal output.The principle of hydrostatic pressure measurement can be understood as follows.
When the liquid level transmitter is put into the liquid to be measured at a certain depth, the sensor is subjected to pressure on the liquid surface by the formula: Ρ = ρ.g.H + Po
In formula.
P: Transmitter pressure against the liquid surface
ρ: Density of the measured liquid
g:local gravitational acceleration
Po: Upper Atmospheric Pressure at the Liquid Level
H: Depth of transmitter into liquid
At the same time, the pressure of the liquid is induced into the positive pressure chamber of the sensor by means of an air-conducting stainless steel, and then the atmospheric pressure Po on the liquid surface is connected to the negative pressure chamber of the sensor to counteract the Po on the back of the sensor, so that the sensor measured pressure is: ρ.g.H. Obviously, by measuring the pressure P, the liquid level depth can be obtained.
Hydrostatic Pressure Conversion Table
| Pa | mmH2O | inH2O | mmHg | Kgf/cm² | Atm | Bar | 1bf/in² |
| 1 | 0.10197 | 4.017mili | 7.5mili | 10.197u | 9.869u | 10u | 14.5mili |
| 9.30665 | 1 | 39.39mili | 73.553mili | 100u | 96.78u | 98.08u | 1.422mili |
| 249 | 25.4 | 1 | 1.8683 | 2.54mili | 2.46mili | 2.48mili | 36.1mili |
| 133.228 | 13.5947 | 0.535 | 1 | 1.359mili | 1.3158mili | 1.3332mili | 19.337mili |
| 98.0665k | 10k | 393.7 | 735.53 | 1 | `0.9673 | 0.930665 | 14.2231 |
| 101.325k | 10.332k | 407.1 | 760 | 1.03323 | 1 | 1.01325 | 14.696 |
| 100k | 10.197k | 401.8 | 750 | 1.01972 | 0.986923 | 1 | 14.5038 |
| 6.895k | 703.1 | 27.686 | 69.61 | 70.31mili | 63.05mili | 63.95mili |