The pressure transmitter hydrogen is an essential device for monitoring hydrogen pressure in hydrogen refueling stations, H2 storage tanks, and fuel cell systems. Their accuracy and reliability guarantee safety and operational efficiency by detecting pressure variations to prevent risks.
Fuji Electric France manufactures high-precision relative and differentialpressure transmitters for the hydrogen industry. These pressure transmitters hydrogen meters use a unique membrane material technology to prevent hydrogen permeation and ensure accurate measurement and extended pressure transmitter life.
In some applications fluids such as hydrogen have atoms that can diffuse through the diaphragm of pressure transmitters.
The oil contamination associated with this diffusion results in a degradation of the measurement accuracy and the life of the pressure transmitter.
Thanks to our patented Hydroseal technology, a unique membrane system with a double gold and ceramic coating, hydrogen penetration is prevented.
Rugged and durable, Fuji Electric's hydrogen pressure transmitter is based on a unique technology.
Its construction offers high resistance to shock and vibration, excellent accuracy up to ±0.065% and outstanding stability.
The pressure transmitter analog output is a 4-20 mA signal. It features HART protocol for easy configuration and self-diagnostic functions.
At both low and high pressures, this pressure transmitter meets your needs for pressure measurement of hydrogen in gas or liquid form, thanks to its extended pressure ranges up to 1500 bar.
The "made in France" construction quality of pressure transmitter guarantees the durability, quality and safety of your hydrogen processes and machines.
Accuracy
STABILITY
RESISTANT
Made in France
A 3 µm layer of gold is applied to the 316L stainless steel diaphragm, and a second layer of ceramic is applied to the gold. The ceramic layer provides electrical isolation between the process fluid and the stainless steel diaphragm, preventing H+ ions from combining with the diaphragm's electrons.
This insulation minimizes the diffusion of hydrogen atoms through the membrane. The following figures show the performance comparison of this design against Hastelloy C, 316L stainless steel and gold-plated 316L stainless steel.
Hydrogen is the smallest atomic element and can therefore penetrate the thin metallic membranes of pressure transmitters.
Water, acids, bases, and the numerous organic compounds contain hydrogen.
Hydrogen is normally found in his molecular state H₂ (also called diatomic), composed of two hydrogen atoms.
H₂ molecules are big enough so that they will not penetrate diaphragms of pressure transmiters.
However, if H₂ molecule splits into hydrogen ions H+, it can penetrate the membrane, as the H+ ions are smaller than the space between the membrane metal molecules.
A 316L stainless steel or Hast C diaphragm offers insufficient protection against hydrogen permeation. This simple construction generates an increased risk of contamination of the filling oil and a deterioration in hydrogen pressure measurement performance.
Examples of generation of H+ ions in the process fluid:
H₂ → H+ + H+
H₂O → H+ + OH-
H₂S → H+ + HS-
Combination of H+ ions and electrons in the diaphragm :
H+ + e- → H
Combination of H atoms in the internal oil of the cell:
H + H → H₂
The Hydroseal diaphragm design from pressure transmitter Fuji Electric offers several advantages for hydrogen pressure measurement:
Fuji Electric pressure transmitters, with their unique hydrogen measurement technology, are used in desulfurization plants, hydrogen production units, oil refineries, fuel cells, vehicle stations, mobility and transport, and OVH wet sludge treatment units.
Hydrogenpressure transmitters is used in a number of different applications. Common uses include fuel cells, H2 gas monitoring and automotive applications. Hydrogen pressure transmitters are essential for these applications, as they measure the pressure of hydrogen gas. Reliable information from pressure transmitter is needed to ensure that the system is operating correctly and to prevent critical problems.
Hydrogen is used to power both space shuttle rockets and hydrogen-powered vehicles.
Hydrogen can be used to generate electricity or heat using a hydrogen fuel cell.
Hydrogen also helps reduce carbon dioxide emissions when burned with oxygen to produce water.
Hydrogen is regularly used in thechemical industry. Hydrogen can be used to make ammonia for fertilizers and also to make methanol for vehicles.
Hydrogen is also used by theoil industry to reduce the viscosity of crude oil during transportation.
In the nuclear industry, hydrogen can accumulate in the nuclear reactor as a result of chemical reactions with metal and water.
Hydrogen is used in steel and metal fabrication. Hydrogen gas is also used in nickel metal processing to form Niadrohydroxide, a catalyst used to produce the high-purity nickel required by the Mond process.
Hydrogen is also commonly used inhydrogenation, for example to transform vegetable oils into margarine and to produce methanol, hydrocarbons and more complex chemicals.
The control and monitoring of these processes by pressure transmitter is essential to guarantee the safety and optimum operation of these hydrogen transport and storage facilities.
The storage pressure of liquid hydrogen is generally very low. Liquid hydrogen must be stored at a very low temperature, around -253 degrees Celsius (-423 degrees Fahrenheit), and the pressure must remain relatively low to maintain this state.
In a cryogenic storage tank for this fuel, pressure is often maintained just above atmospheric pressure, at around 1 bar to 5 bar, to prevent excessive evaporation and maintain liquid stability.
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