The Hydrostatic Pressure Transmitter measures the hydrostatic pressure exerted by a hydrostatic head. Use these hydrostatic pressure transmitters to measure the liquid level in storage tanks, processing vessels, collection tanks, pump inlet heads. And other applications use hydrostatic pressure to determine the liquid height. The pressure transmitter used to measure liquid level can be called: pressure liquid level transmitter. It is mainly used for open non-pressure vessels. One is submersible type, and the other is flat film installation.

Static Pressure/Hydrostatic Pressure Transmitter

You may often hear Hydrostatic Pressure Transmitter or static pressure transmitter. So are they the same? What is their role? Next, the Sino-Inst engineer will take you to take a look.

Static pressure refers to the pressure on the surface of an object when it is stationary or moving in a straight line at a constant speed. The unit is pa. Static pressure plus dynamic pressure equals total pressure.

Static pressure pile construction is a pile-driving process in which the pile driver’s own weight and the counterweight on the frame provide reaction force through the pile driving mechanism of the static pile driver to press the pile into the soil. This kind of pile driving method completely avoids the vibration, noise, and pollution caused by hammering pile driving. Therefore, it has the advantages of no noise, no vibration, no impact, no pollution, etc. during construction.

Advantages: no noise, no vibration, no impact
Field: Fluid Dynamics

  1. The pressure generated by the fluid when it is at rest.
  2. The pressure perpendicular to the direction of fluid movement generated by the fluid when it flows.
  3. The gauge pressure value measured in a fluid that is not affected by the flow rate.

Static 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
14.6960
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

1in=25.4mm ; 11b=445g ; k=1000; mili=0.001 ; u=0.00000

Hydrostatic pressure is the pressure exerted on an object by a homogeneous fluid. This is a kind of Omni-directional force, and it is evenly applied to all parts of the surface of the object. The increase in hydrostatic pressure will reduce the volume of the stressed object, but will not change its shape.

The pressure on the rock deep inside the earth’s crust is similar to this. It comes from the overlying rock layer and is called lithostatic pressure. There is also strong pressurization of the capacity load of water.

Hydrostatic Level Measurement

Hydrostatic level measurement is often used for tank level measurement. Hydrostatic level measurement is one type of continuous level measurement.

Hydrostatic level measurement is based on the principle that the Hydrostatic is proportional to the height of the liquid. Hydrostatic submersible pressure level transmitter is the most commonly used level measurement sensor. Of course, the differential pressure transmitter can also measure the liquid level. A hydrostatic level sensor is a submersible pressure transmitter that has a pressure diaphragm at the end of level probe. A hydrostatic level sensor is a submersible pressure transmitter that has a pressure diaphragm at the end of level probe. This Hydrostatic is caused by the weight of the fluid on top of the transmitter and is used to calculate the level. And the inner side of the diaphragm is vented to atmospheric pressure.

Featured Static Pressure/Hydrostatic Pressure Transmitters

Hydrostatic Level Measurement Calculation

Liquid level sensors based on hydrostatic liquid level measurement usually measure the filling height of the container according to the following principles:

The liquid passes its specific gravity and gravity. The gravity increases with the filling height. This kind of gravity, which increases with the increase of the filling height, is called a liquid column.

So, if a static pressure type liquid level sensor is selected. This transmitter will measure the corresponding height of gravity of the liquid column as the hydrostatic pressure. Based on the measured hydrostatic pressure and product density. Now you can also calculate the filling height of the container.

Hydrostatic Level Measurement

Hydrostatic level measurement has enjoyed a high reputation for many years and represents 40% of the market share. It is by far the most common electronic liquid level measurement method. Most importantly, it is well known for its high reliability and low installation cost. Therefore, users think that hydrostatic level measurement is very simple and powerful.

Hydrostatic Level Transmitter Advantages and Disadvantages

About Hydrostatic level transmitter advantages and disadvantages, we do a simple analysis here. If you want to know more about the advantages and disadvantages of level transmitters. Please refer to Sino-Inst Level Transmitters.

Advantages

  • High measurement accuracy;
  • The ultra-high range can be customized up to 1000 meters.
  • Easy to install;
  • The signal can be transmitted remotely;
  • The corrosion of various media can be resisted by choosing different materials;
  • Suitable for explosion-proof occasions;
  • Low cost;

Disadvantages

  • The measurement signal needs to be converted;
  • When the measuring range is greater than 5 meters, it is impossible to measure the high temperature medium temperature exceeding 125 ℃;
  • The density of the measuring medium must be uniform.

Static Pressure Effect in Pressure Transmitter

Static pressure is easy to understand. It is the maximum bearable pressure.

For example, the differential pressure range you measure is 0-1KPa. This pressure may be that the pressure on one side is 0. The other side is 1KPA. At this time, the maximum static pressure is 1KPA.

The differential pressure range you measure is 0-1KPa. This pressure may be that the pressure on one side is 10000KPa and the other side is 10001KPA. At this time, the maximum static pressure is 10001KPA.

Although the measuring range is the same. The pressure displayed by the transmitter is the same. But the static pressure value of the two pressure transmitters is completely different. The sensor selected for the transmitter is also different.

The verification of the influence of the static pressure of the pressure transmitter is as follows:

  1. Connect the high and low pressure chambers of the transmitter to the atmosphere and measure the lower limit of output.
  2. Introduce the static pressure to slowly change from atmospheric pressure to rated working pressure. After stabilizing for 3 minutes, measure the lower limit of output. And calculate the difference of the lower limit of output to atmospheric pressure.
  3. Transmitter with adjustable input range. Except for special regulations, the static pressure influence verification should be carried out on the smallest range. After verification, it should be restored to the original range.

High Static Differential Pressure Transmitter

The high static pressure differential pressure transmitter is used to measure the level, flow and pressure of liquid, gas or steam in a high working pressure environment. Then it is converted into a 420mA DC signal output. The HP intelligent type can communicate with the HART handheld communicator. Use it to set up, monitor or form an on-site monitoring system with the host computer.

Influence of static pressure

①Zero point: ±0.2% URL under 31027kPa static pressure. The zero point error can be corrected online through zero adjustment.
②Range: can be corrected to ±0.25% output reading/6895kPa

In addition, the excellent static pressure performance of the monocrystalline silicon differential pressure transmitter is also better than that of the capacitive products on the same occasion. The optimal static pressure error can be controlled within ±0.05%/10MPa.

Frequently
Asked
Questions

The maximum static pressure should be the maximum pressure that the pressure transmitter is allowed to withstand. If this pressure value is exceeded, the diaphragm of the pressure transmitter will be damaged and the measurement accuracy will decrease. If it is a differential pressure transmitter, it means two positive and negative pressure chambers. The maximum allowable pressure is applied on both sides at the same time.

pressure transducer often called a pressure transmitter, is a transducer that converts pressure into an analog electrical signal.

Although there are various types of pressure transducers, one of the most common is the strain-gage base transducer.

The conversion of pressure into an electrical signal is achieved by the physical deformation of strain gauges, which are bonded into the diaphragm of the pressure transducer, and wired into a Wheatstone bridge configuration.

Pressure applied to the pressure transducer produces a deflection of the diaphragm, which introduces strain to the gages.

The strain will produce an electrical resistance change proportional to the pressure.

Read more about How does a pressure transmitter work?

DPT is the abbreviation of Differential Pressure Transmitter.

The static pressure level transmitter is based on the principle that the measured liquid static pressure is proportional to the height of the liquid. Adopt the piezoresistive effect of foreign advanced isolation diffused silicon sensor. Convert static pressure into electrical signal. After temperature compensation and linear correction. Converted into a standard electrical signal. It is suitable for liquid level measurement of various media in petrochemical, metallurgical, electric power, pharmaceutical, water supply and drainage, environmental protection and other systems and industries.

Working principle of hydrostatic level transmitter

When the liquid level transmitter is thrown into a certain depth in the measured liquid. The formula for the pressure on the front surface of the sensor is: Ρ=ρ.g.H+Po. Where:

  •   P: pressure on the face of the transmitter
  •   Ρ: the density of the measured liquid
  •   G: local gravitational acceleration
  •   Po: Atmospheric pressure on the liquid surface
  •   H: the depth of the transmitter into the liquid

At the same time, the pressure of the liquid is introduced into the positive pressure chamber of the sensor through the gas-conducting stainless steel. Then connect the atmospheric pressure Po on the liquid surface to the negative pressure chamber of the sensor. To offset the Po on the back of the sensor. Make the pressure measured by the sensor: ρ.g.H. Obviously, the pressure P is measured. The depth of the liquid level can be obtained.

Hydrostatic Pressure Transmitter Price

The price of Hydrostatic Pressure Transmitter is not much different from that of ordinary pressure transmitters. The price of Hydrostatic Pressure Transmitter can be determined according to the customer’s parameters. About USD150~350.00.

Sino-Inst offers over 20 Static Pressure/Hydrostatic Pressure Transmitter. A wide variety of Static Pressure/Hydrostatic Pressure Transmitter options are available to you. Such as free samples, paid samples. 

Sino-Inst is a globally recognized manufacturer of Static Pressure/Hydrostatic Pressure Transmitters, located in China. Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Static Pressure/Hydrostatic Pressure Transmitters products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

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