Differential pressure transmitter

Differential pressure transducers are devices that measure the pressure difference between two points in a system. They are an essential part of fluid mechanics and are widely used in many fields, such as the energy, chemical and oil & gas industries. This industrial pressure transmitter are very accurate and can measure very low pressures with great precision. They are often used to monitor and control industrial processes, to measure levels or flows, to detect leaks in pipes and to monitor the performance of motors and pumps.


Benefits of the FCX differential pressure sensor

Benefits of the FCX differential pressure sensor

The FKC high-precision differential pressure transmitter models from Fuji Electric accurately measure a differential pressure and transmit a proportional 4-20 mA electrical output signal. Manufactured in France, the differential transmitter uses a unique and highly reliable micro-capacitive silicon sensor, combined with state-of-the-art digital signal processing, to provide outstanding performance in terms of accuracy and stability.

As an instrumentation specialist, manufacturer of pressure transmitters and expert in gas analysis, our expertise extends to all industrial measurement solutions: pressure measurement, flow measurement, level measurement, temperature control, gas analysis and radiation monitoring.

Technical advantages of differential pressure transmitter FCX

Differential pressure measurement with diaphragm seals

Differential pressure measurement with diaphragm seals

Differential level measurement with diaphragm seals

Differential level measurement with diaphragm seals

Level or differential density measurement with diaphragm seal PFA

Level or differential density measurement with diaphragm seal PFA


What is the principle of the differential pressure sensor?

Differential pressure (dp) is the difference in pressure between two pressures.

The differential pressure cell compares two pressures:

The differential pressure sensor converts the pressure difference into an electronic signal.

What is the principle of the differential pressure sensor?

How does the differential pressure sensor work?

How does the differential pressure sensor work?

The pressure has two pressure ports: one port for low pressure (LP) and one port for high pressure (HP).

Each of these ports is connected to a metal membrane.

When process pressure is applied through each of these ports, it deforms the metal diaphragm.
The FCX intelligent industrial pressure sensor measures the pressure difference by the change in deformation of two metal diaphragms.

The metal diaphragms will transmit the measured pressure via an internal fluid to the micro-capacitive measuring element.

The pressure exerted on both sides of the element will compress the element. The deformation measured is proportional to the differential pressure to be measured.

The signal is then digitally processed by the electronic unit to obtain an analogue and digital signal.


What is the unit of differential pressure?

What is the unit of differential pressure?

The unit of measurement for differential pressure is the pascal (Pa).
There are also other differential pressure units that are commonly used, including bar, millibar, mmWC.


What are the pressure ranges of differential pressure transmitters?

What are the pressure ranges of differential pressure transmitters?

Several differential pressure ranges are available for differential pressure transmitters. The measurement ranges available range from 0 to 1 mbar for the lowest to 0 to 30 bar for the highest.

These available pressure ranges meet the requirements of a wide variety of applications for effective monitoring of fluid processes.


What is the output signal of a differential pressure sensor?

Depending on the use of the differential pressure sensor, the output signal can be programmed as either linear (output proportional to differential pressure) or as square-root (output proportional to flow).

The square root output function on a differential pressure sensor is used to measure the velocity of a fluid.

We then use the relationship between the speed of the fluid and the differential pressure which is generated by the flow rate of the fluid (Bernoulli's law).

What is the output signal of a differential pressure sensor?

This relationship is expressed by the following equation:

V = sqrt((P1 - P2) / (1/2 * rho))

P1 = Pressure on the high pressure side -HP) measured upstream of the fluid flow

P2 = Pressure on the low pressure side (LP) measured downstream of the fluid flow

rho = Density of the fluid

V = Fluid velocity


What are the application areas of differential pressure transmitters?

The different types of differential pressure sensors are used in many applications, from flow measurement to level measurement, through filtration and density measurement, as well as interface measurements.
They can be used for:

What are the application areas of differential pressure transmitters?

  • Measure a differential pressure, to monitor a pump.
  • Measure a pressure drop, to monitor filter clogging.
  • Measure hydrostatic liquid or gas level measurement continuously, for a pressure vessel.
    The high pressure (HP) side of the level sensor cell measures pressure.
    The low pressure (LP) side of the level sensor cell measures the headspace pressure.
    The pressure difference between the high and low pressure sides allows the pressure transmitter to calculate the level.
    The density must be constant to guarantee the accuracy of the level measurement.
  • Measure a volume or mass flow of a fluid (liquid flow, gas flow, water flow or steam flow).
    In the latter case, the differential pressure transmitter is associated with a primary element which creates a differential pressure according to the flow rate of a fluid.
  • Measure an interface or a density.
  • For applications with very low or very high temperatures, the differential pressure sensors can be equipped with one or two diaphragm seals.


What are the advantages of the differential pressure transmitter?

Differential pressure sensors have many advantages for industrial processes.

Why use a differential pressure transmitter rather than two gauge pressure transmitters?

Measuring the pressure difference between two points in a system is simplified by using a differential pressure transmitter.
This measuring instrument is designed to accurately measure differential pressure and provide a corresponding digital pressure signal.
With a differential pressure transmitter, you can accurately measure the pressure difference without having to do manual calculations.

Another way to measure differential pressure is to use two gauge pressure transmitters. You then have to measure the pressure separately and calculate the pressure difference manually.
This process can be laborious and error-prone.

Also, if you are using two gauge pressure transmitters, it is essential to ensure that each transmitter is accurately calibrated for accurate pressure measurements.

Indeed, if one of the pressure sensors is offset, the measurement of the differential pressure may be erroneous.

By using a differential pressure sensor, you get rid of these problems and the risk of measurement errors. You use only one device, specifically designed for this differential pressure measurement application. You get accurate, reliable measurement you can rely on.


Control your industrial processes with our pressure transmitters products, even at very low pressure!

The differential pressure transmitter: an indispensable ally for the efficiency of your systems.