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Absolute pressure transmitter

In many industries, accurately and reliably measuring absolute pressure is essential to ensuring process performance and plant safety. The ca...

In many industries, accurately and reliably measuring absolute pressure is essential to ensuring process performance and plant safety. pressure transmitters measure pressure relative to absolute zero, regardless of atmospheric variations.Discover Fuji Electric's range of pressure transmitters , designed to provide stable, repeatable measurements suitable for the most demanding industrial environments.These robust and intelligent instruments ensure easy integration, high accuracy, and long-term stability, while optimizing the performance of automation systems.

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Absolute pressure transmitter - FKA
ref : FKA
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depending on configuration
1597,00 €
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Absolute pressure transmitter - FKH
ref : FKH
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1262,00 €
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Diaphragm seal absolute pressure transmitter - FKH F
ref : FKH F
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2204,00 €
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Diaphragm seal absolute pressure transmitter - FKM
ref : FKM
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3372,00 €
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Nuclear qualified absolute pressure transmitter - FKA - NC-K3
ref : FKA - NC - K3

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Nuclear qualified diaphram seal absolute pressure transmitter - FKM - NC - K3
ref : FKM- NC - K3

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Absolute pressure transducer - GA
ref : GA
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332,00 €
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Technologies

Industrial Pressure transmitter ATEX SIL2 SIL3
The pressure transmitter industrial ATEX SIL 2 SIL 3 for liquid, gas and steam. Continuously measures pressure, flow, level and density. Available in ATEX.
Discontinuating producs - Pressure transmitters
Fuji Electric improves its pressure transmitters with the latest technological innovations. Discover our comparative table of old and new references for a simplified transition and optimal performance.

Buying Guide for absolute pressure transmitters

Absolute pressure transmitters are used in industrial applications where it is essential to measure absolute pressure without any dependence on variations in atmospheric conditions.

Brochure

Pressure transmitters FCX-AIV Fuji Electric

Download the brochure and find out how to improve your measurement accuracy with Fuji Electric absolute pressure transmitters .

What is the principle of absolute pressure transmitter ?

Absolute pressure transmitter with integrated digital display showing 0.00%

Absolute pressure transmitters measure the process pressure of atmospheric air, other gases, vapors and liquids relative to the reference point of absolute zero, i.e. a perfect vacuum. All pressure transmitter takes measurements relative to a reference pressure. These pressure transmitters operate using the pressure of perfect vacuum (absolute zero) as a reference.

A total vacuum corresponds to an absolute pressure of 0 bar, and the average barometric pressure at sea level is 1013.25 mbar. On the other hand, sensors that quantify the difference between process pressures and atmospheric pressure are called gauge pressure transducers. Differential pressure transmitters, on the other hand, measure two opposing pressures.

How does the absolute pressure transmitter work?

Schematic diagram of an pressure transmitter with membrane, internal vacuum, and microcapacitive sensor

The intelligent FCX industrial pressure transmitter calculates and measures pressure by changing the deformation of a metal diaphragm.

The low-pressure side of the sensor is subjected to an absolute vacuum, then sealed.

As a result, the measured diaphragm deformation is unaffected by external pressure and serves as a zero point for the closed vacuum envelope.

What are the advantages of absolute pressure transmitter ?

Industrial absolute pressure transmitter with aluminum housing and integrated front display

As these pressure transmitters are not affected by variations in atmospheric pressure, their measurement is more accurate than relative pressure transmitters (for normal applications).
They also have high repeatability and long-term stability.

HIGH REPEATABILITY
LONG-TERM STABILITY
precise measurement

What are the disadvantages of absolute pressure transmitter ?

Stainless steel threaded process connection mounted on an industrial pressure transmitter

These pressure transmitters are generally more expensive than gauge pressure transmitters.
Another disadvantage of this type of sensor is that its maximum pressure capacity is much lower than that of digital gauge pressure transmitters. They require special tools to be calibrated and can often take longer.Mark up: span

You can ask our instrument calibration service team to help you with this task.

What is the unit of absolute pressure?

The unit of measurement for absolute pressure is indicated by the letter 'a' or the abbreviation 'abs' (i.e., in bar (abs), H₂O (abs), psia, or kPa (abs)).

Diagram comparing absolute pressure, gauge pressure atmospheric pressure with reference to vacuum — Explanatory diagram showing the difference between absolute pressure, gauge pressure atmospheric pressure in relation to a vacuum.

What are the pressure ranges of absolute pressure transmitters?

Stainless steel sensor element with front membrane for absolute pressure measurement

Their range can extend from vacuum to several bars with excellent long-term stability.
The maximum operating pressures they can measure vary.
In many cases, they can measure pressures as high as 30 bar (abs) with excellent accuracy and stability.

What are the fields of application of absolute pressure transmitters?

Oil refinery with distillation columns and industrial facilities at sunset

In general, they are capable of measuring the pressure of any gas or fluid under pressure.
These pressure transmitters used in the chemical and petrochemical industries, the food industry, the metallurgical industry, the oil and gas industry, and laboratories and research institutes.
For these industrial applications, it is imperative that measurements are accurate and that a fixed vacuum pressure (absolute zero) is used as a reference.

This ensures that your processes are free from fluctuations in atmospheric pressure.
This type of sensor is the only device capable of measuring atmospheric pressure, so it can be used to assess barometric pressure.
Altitude calculation based on atmospheric pressure variation during altitude changes is another example of its use.

level measurement on low-level storage tanks
gas pipeline pressure monitoring
barometric pressure measurement

Why use an absolute pressure transmitter rather than a gauge pressure transmitter?

Various models of pressure transmitters with process connections and integrated display

Changes in temperature, pressure, and humidity all affect atmospheric pressure.

The atmosphere's pressure can fluctuate by about 30 mbar due to weather changes, and by about 200 mbar if the sensor's elevation changes.
As a result, for the same measured pressure, a digital pressure gauge may provide a measurement error owing to atmospheric pressure variations.
When measuring low pressures, this error could be significant.
In such a case, the use of an absolute pressure sensor is recommended.

pressure transmitters on an industrial pipeline for level measurement

A typical application is measuring the liquid levelthat can be found using a gauge pressure sensor in open (i.e., non-pressurized) tanks.

Raw material liquids are stored, and the tank is freely vented above the liquid, the hydrostatic pressure of the liquid column is used to calculate the volume.

For low height tanks, levels could fluctuate significantly over time owing to ambient air pressure influencing both sensor readings and the vessel's ventilation, resulting in an incorrect liquid level being calculated. It is important to choose for absolute pressure sensors to guarantee accurate measurement.

Benefits of the absolute pressure transmitter FCX

Absolute pressure transmitter with dual housing and integrated process connections

Fuji Electric's high-precision absolute pressure sensors accurately measure absolute pressure and transmit a proportional 4-20 mA electrical output signal. The transmitter uses a unique and highly reliable micro-capacitive silicon sensor, combined with state-of-the-art digital signal processing to deliver exceptional performance in terms of accuracy and stability.

Precise measurement results regardless of weather conditions
Significant process performance thanks to 4D Gyration^TM characterization
High plant availability thanks to unique, highly reliable design

4D Gyration diagram illustrating static pressure, differential pressure, and process temperature — Illustration of 4D Gyration technology integrating static pressure, differential pressure, and temperatures for more reliable measurements.

Pressure transmitter installed on an external pipe with fittings and measuring cables

Technical features

High precision and reliability
Designed for minimum inventory
Minimal environmental influence
HART communication protocols with local operator interface
Flexible application
Programmable output and linearization function
Long-term stability

Don't be stymied by atmospheric conditions and opt for an absolute high-performance pressure transmitter !

In industrial environments where precision is critical, reliable absolute pressure measurement is key to ensuring process performance, safety, and stability.

Fuji Electric pressure transmitters combine cutting-edge technology and robust design to provide accurate measurements, independent of atmospheric pressure variations, even in demanding operating conditions.

Thanks to their high precision, excellent long-term stability, and compatibility with industrial automation systems, these transmitters help optimize process control and reduce the risk of unplanned downtime.

Contact Fuji Electric France to benefit from the support of our experts and select the pressure transmitter best suited to your industrial applications.

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