Level measurement: hydrostatic level transmitter | Fuji Electric

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Retractable liquid level transmitter
ref : FKP (ball valve mounting)

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Pressure transmitter - FKE
ref : FKE
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depending on configuration
2296,00 €
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Diaphragm seal gauge pressure transmitter - FKB
ref : FKB
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depending on configuration
2725,00 €
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Diaphragm seal differential pressure transmitter - FKD
ref : FKD
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depending on configuration
3716,00 €
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Gauge pressure transmitter - FKP
ref : FKP
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depending on configuration
1029,00 €
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Gauge pressure transmitter - FKG
ref : FKG
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depending on configuration
1235,00 €
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Differential pressure transmitter FKC - high static pressure
ref : FKC-HIGH STATIC PRESSURE

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Nuclear diaphragm seal gauge pressure transmitter - FKB - NC - K3
ref : FKB- NC - K3

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Nuclear diaphragm seal differential pressure transmitter - FKD - NC - K3
ref : FKD- NC - K3

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Nuclear gauge pressure transmitter - FKG - NC - K3
ref : FKG - NC - K3

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Nuclear differential pressure transmitter - FKC - NC - K3
ref : FKC - NC - K3

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Nuclear analog diaphragm seal gauge pressure transmitter - FYB - K3
ref : FYB - K3

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Nuclear analog diaphragm seal absolute pressure transmitter - FYD - K3
ref : FYD - K3

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Nuclear analog pressure transmitter - FYC - K3
ref : FYC - K3

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retractable liquid level transmitter
The retractable level sensor is the perfect solution for measuring liquid levels in tanks and vats without having to empty them.
Hydrostatic pressure transmitter for level measurement
Hydrostatic level transmitters accurately measure liquid levels. The economical solution for the chemical and petrochemical industries.
Diaphragm seal pressure transmitter
Diaphragm seal pressure and level transmitter. Ideal for the most demanding applications: chemicals, paper, oil. Capillary and rigid diaphragm seals available.
Discontinuating producs - Hydrostatic level transmitters
Discover how Fuji Electric innovates with its new hydrostatic level sensors. Compare old and new references in our detailed table.

Buying guide for hydrostatic level transmitters

Engraved portrait of Evangelista Torricelli, a 17th-century Italian mathematician who discovered the fundamental principle of hydrostatics.

What is the principle of hydrostatics?

Hydrostatics is a science that deals with the properties of vacuums, liquids, and vapors.
This discipline is based on the action of pressure exerted by fluid on its surface to determine the heights or volumes involved.
The principle of hydrostatics was developed in the 16th century by an Italian mathematician named Evangelista Torricelli (1608-1647). It is one of the fundamental principles of hydraulics.

Industrial hydrostatic level sensor with mounting flange and electronic housing for fluid pressure measurement

What is a hydrostatic level transmitter?

Hydrostatic level transmitters measure hydrostatic pressure, which is proportional to the measured liquid height.
Consisting of a pressure measuring cell, the stainless steel or other material membrane of the sensor reacts to level changes.
The force exerted by the membrane is converted by the level probe into an analog electrical output signal.

Formula for calculating hydrostatic pressure linking pressure to fluid density, gravity, and height

How is hydrostatic level measurement calculated?

The relationship between the height h of the liquid and the hydrostatic pressure P in a liquid at rest and at atmospheric pressure, can be written as follows:

g = 9.81 m/s 2 , constant, the Earth's acceleration due to gravity (at sea level) ;
ρ = density of the liquid ;
h = height of liquid.

The pressure measured by the transmitter is proportional to the liquid column. For example, for a water level measurement in a tank, the pressure varies by 100 mbar per meter of water column. For a tank height of 12 meters, the level sensor measures a pressure of 1.2 bar relative to the sensor diaphragm.

Industrial hydrostatic level measurement system with pressure transmitter to a tank

How does hydrostatic level measurement work?

Hydrostatic level measurement involves determining the height of a liquid using the hydrostatic pressure exerted by the liquid on its surface.The higher the liquid level, the higher the measured pressure applied to the diaphragm. There are two different methods for measuring hydrostatic level.

Hydrostatic gauge pressure level sensor gauge pressure process flange and electronic housing mounted on an industrial line

Gauge pressure measurement methods

Level measurement by gauge pressure

A pressure transmitter measures static pressure at a low point in the tank. This pressure is then converted into height using the hydrostatic level equation.

Hydrostatic differential pressure level sensor with two pressure ports connected to an industrial tank

Differential pressure measurement methods

Measurement of the differential pressure level

In closed tanks, a second measurement is required to measure the head pressure (air or gas above the measured liquid). A differential pressure transmitter measures the differential pressure at two different points in the tank where the tank is subjected to a pressure different from atmospheric pressure. The measuring cell calculates the pressure difference between these two points to determine the liquid level.

Cylindrical stainless steel industrial tanks used for storing liquids in process facilities

What are the applications of hydrostatic pressure transmitter level measurement?

For accurate hydrostatic level measurement, the specific weight of the product in the tank or reservoir and gravity must be taken into account.
pressure transmitters are preferred for use where the density of the liquid is constant.

Common industrial applications for hydrostatic pressure transmitter level measurement include the following:

Level control in tanks or pressure vessels
Level measurement in open-air or ventilated industrial tanks
Level-dependent pump start-up and shutdown in open water and wastewater pipes
Dosing and distribution of liquids in processes
Automation of industrial level control processes and data transmission. These pressure transmitters are used in processes in the chemical and petrochemical industries (chemicals), the food industry (water, beverages, milk), the water industry (water and wastewater), the environment and the shipbuilding industry (seawater).

Diagram illustrating hydrostatic level measurement in a tank using submerged lateral pressure measurement

What are the advantages of hydrostatic level measurement?

Hydrostatic level probes use proven measurement technology because they offer numerous advantages, including:

Reliable, precise measurement
Insensitive to foam and viscosity
Independent of liquid dielectric constant
Easy to install
Works even with agitators
Compatible with all internal tank structures
Wide measuring range
Long-term stability

Reliable, precise measurement
Insensitive to foam and viscosity
Easy to install
Compatible
Long-term stability

Diagram showing a tank with dense liquid and lateral pressure tap illustrating the limitations of hydrostatic level measurement

What are the disadvantages of hydrostatic level measurement?

The hydrostatic level sensor only works on liquids.
Hydrostatic level transmitters offer measurement by contact with the fluids to be measured.
Measurement is dependent on the density of the liquid to be measured and the pressure in the vessel.
Regular maintenance is required to clean the sensor membrane of deposits and debris. Level measurement solutions with flush diaphragms or hygienic connections avoid the creation of retention zones.
Work on level transmitters may require the tank to be drained. Level measurement systems with integrated ball valves eliminate this constraint. Level probes can thus be removed without emptying the tank.

Industrial installation with hydrostatic level sensor mounted on a pipe and connected to a tank for pressure measurement

How to choose a hydrostatic level sensor?

To select a hydrostatic pressure transmitter , it is important to know the following parameters:

the nature of the liquid (water, milk, oil, chemicals, etc.)
product density
process corrosiveness and abrasiveness
liquid height (measurement range)
type of tank (atmospheric or pressurized)
reservoir pressure
fluid temperature
type of process connection (flanged, screwed, hygienic, etc.)
local or remote display
a protection index

The choice of level probe will depend on these components. The scale of the sensor's measuring cell and the materials used in its construction, such as stainless steel, Hastelloy C, and Monel, must be suitable to ensure reliable and accurate measurement display over time.

Fuji Electric range of sensors and transmitters for hydrostatic level measurement in gauge pressure differential pressure — Overview of Fuji Electric hydrostatic level measurement solutions, renowned for their reliability and industrial performance.

Fuji Electric sensors and transmitters for hydrostatic liquid level measurement with membranes, flanges, and electronic housing

Fuji Electric solutions for liquid level measurement

Fuji Electric offers state-of-the-art hydrostatic pressure transmitters that meet the specific needs of different industries. These include the diaphragm seals pressure transmitter and the hydrostatic pressure transmitter .

Fuji diaphragm seals pressure transmitter is designed to accurately measure pressure in harsh and corrosive environments. It offers excellent long-term stability, high resolution, and high accuracy, making it an ideal choice for demanding industrial applications.
Fuji Electric's pressure transmitter is specially designed for measuring liquid levels. This sensor offers high accuracy, corrosion resistance, and exceptional durability, even in extreme conditions.

These products offer advantages such as :

Precise, reliable liquid level measurement
Resistance to corrosive and harsh environments
Long service life and low maintenance

Aerial view of technicians wearing helmets working on industrial tanks during a maintenance operation

Importance of hydrostatic pressure transmitters in industry

pressure transmitters are essential for ensuringthe efficiency and safety of industrial processes that require accurate liquid level measurement. The solutions offered by Fuji Electric, such as diaphragm seals pressure transmitter, retractable level sensors, and pressure transmitter, are reliable and technologically advanced tools that can be used in various industries to solve common problems related to liquid level measurement.

By choosing Fuji Electric as your trusted supplier for these essential products, you not only benefit from high-quality pressure transmitters , but also from a strong partnership and dedicated technical support to ensure the success of your projects.

Fuji Electric range of sensors and transmitters for hydrostatic level measurement in gauge pressure differential pressure — Overview of Fuji Electric hydrostatic level measurement solutions, renowned for their reliability and industrial performance.

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