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7 factors that influence the accuracy of your pressure transmitters

Whatever your industry, greater pressure measurement accuracy means better end product quality, safety and increased production line efficiency.

What are the 7 factors that influence the accuracy of your pressure transmitters ?

The accuracy of measuring instruments such as pressure transmitters degrades over time. Thus, the zero point of the transmitter drifts over the months, which affects the accuracy of the pressure measurement.
To compensate for this, pressure measuring devices can be calibrated on a regular basis by using a measuring device calibration company.
Fuji Electric's pressure transmitters offer an excellent long-term stability of ±0.1% over a period of 5 years, which guarantees an accurate measurement over time and allows you to extend your calibration intervals and reduce your maintenance costs.

Fuji Electric's pressure transmitters are compensated to avoid the influence of these factors and achieve reliable and accurate measurements without degradation.

In this article we explain the seven factors that influence the accuracy of pressure transmitters.

The surrounding temperature and the fluid temperature

Surrounding temperature and fluid temperature are two factors that influence the accuracy of a pressure transmitter. Each transmitter has temperature tolerances. The temperature range leads to variations in the accuracy of the transmitter. The more extreme the ambient or process temperature, the less accurate the transmitter. When choosing your pressure transmitter, it is important to check that the temperature ranges of the pressure transmitter are suitable for your application.

Some pressure transmitters are temperature-compensated at the time of manufacture over a specific temperature range to avoid temperature variations that could have a negative influence on accuracy. When choosing your supplier, look for an instrument with a temperature compensation function.

Fuji Electric's pressure transmitters are equipped with the unique 4D Gyration&#; technology, which ensures accurate measurements regardless of variations in ambient temperature and static pressure. 

Static pressure

What is static pressure?

The differential pressure transmitter measures the pressure difference between two measuring points in comparison to the relative pressure transmitter (which measures in comparison to atmospheric pressure) or absolute pressure transmitter (which measures in comparison to void).

Static pressure, also called line pressure, is the pressure in a pipe or process. This process pressure applies to both pressure taps of the differential transmitter.

Influence of static pressure

When both pressure taps of the differential pressure transmitter are at atmospheric pressure then the pressure measured by the transmitter is zero. If an identical higher pressure is applied to both inputs in the same way, the measured pressure is also zero in theory. In practice, the static pressure influences the accuracy of differential pressure transmitters.

Line pressure negatively affects the accuracy and repeatability of the measurement. Static pressure can have an effect on the transmitter zero and span. Field calibration can help eliminate the effects of static pressure in the process.

Fuji Electric'spressure transmitters differential sensors are static pressure-compensated at the time of manufacture to avoid errors that could render the sensor inaccurate. When choosing your supplier, look for a device with a static pressure compensation function.

Static pressure must be taken into account when choosing a differential pressure transmitter. These have a maximum permissible static pressure which must not be exceeded.
 

Changing the scale of pressure measurement

The accuracy of the measurement varies depending on the measurement scale set on the transmitter.

The scaling dynamics of the pressure transmitter defines the minimum adjustable measuring range in relation to the total pressure scale of the transmitter. This rangeability ratio is a decisive factor when selecting a pressure transmitter.

If the set scale is outside the dynamic range, the accuracy of the measurement is degraded.

Fuji Electric's pressure transmitters have a high dynamic range of 1:100 which allows low pressure scales to be set without affecting the accuracy of the measurement. It is recommended to choose pressure transmitters with a full scale range as close as possible to the actual pressure to be measured.

Long-term stability

The accuracy of measuring instruments, such as pressure transmitters, deteriorates over time. As a result, the zero point of the sensor drifts over the months, affecting the accuracy of the pressure measurement.
To compensate for this, these pressure measurement devices can be calibrated on a regular basis by a measurement device calibration company.
Fuji Electric's pressure transmitters offer excellent long-term stability of ±0.1% over a 5-year period. This guarantees accurate measurement over time, enabling you to extend calibration intervals and reduce maintenance costs. 

The mounting position of the pressure sensor

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The mounting position has an influence on the zero point of the pressure transmitter. Even if the pressure transmitters are calibrated at the factory, a shift in the measurement due to the mounting position can be observed on site after installation. This can make the pressure measurement inaccurate. This effect is caused by the weight of the oil filling the measuring cell.

For diaphragm seals pressure transmitters, this effect may be more pronounced due to the larger volume of oil in the transmitter. There is no effect of the mounting position on the scale range.

Field calibration is imperative to eliminate any zero offset caused by the effect of mounting position. To carry out this adjustment, pressure transmitters usually features an adjusting screw and a manifold.

Intelligentpressure transmitters devices with HART protocol can be set using a portable communication pocket or a PC equipped with HART® modem configuration software.

Vibrations

The measuring cells of pressure transmitters can be disturbed by vibrations on industrial equipment. Vibrations have an effect on the accuracy of the measurement. In some cases, it can lead to damage to the transmitter or a shortened service life.

Fuji Electric pressure transmitters have been tested by independent laboratories at very high vibration levels to verify their accuracy and robustness. It is worth asking your transmitter manufacturer for the test results to ensure the vibration resistance of your installations.

The supply voltage of the pressure transmitter

Pressure sensors are supplied with 24 V DC. However, they can generally be operated over a wider voltage range. Incorrect or fluctuating voltage can influence the measurement or even destroy the transmitter in the event of an overvoltage.

It is recommended to use an isolated, stabilised and regulated power supply to avoid inaccuracy of measurement.
Fuji Electric pressure transmitters have a wide power supply range from 10.5 V DC to 45 V DC to ensure minimal influence of the supply voltage on the measurement accuracy.

Don't let your next pressure transmitter be influenced

When choosing your pressure transmitter supplier:

• Demand accurate measurement in any environment.
• Demand a wide 1:100 measurement dynamic range from 1 mbar to 500 bar.
• Demand high long-term stability.
• Demand on-site commissioning and calibration services.
• Demand pressure transmitters that  can withstand the most intense vibrations.
• Demand a wide power range for your transmitters.

Factor typeImpact on AccuracyRecommendations for minimizing the effectAmbient and process temperatureTemperature variations can cause significant measurement errors.Use pressure transmitters with temperature compensation to minimize these variations.Static pressureNegatively affects the accuracy and repeatability of pressure transmitters differential.Choose pressure transmitters with static pressure compensation and perform on-site calibration.Change of measurement scaleIncorrect setting of the scale can degrade measurement accuracy.Choose a suitable measurement scale and use pressure transmitters with a high dynamic range of 1:100.Long-term stabilityZero drift over time can affect measurement accuracy.Plan regular calibrations to maintain the long-term accuracy of your pressure transmitters. Choose pressure transmitters with high long-term stability.Mounting positionThe position can modify the sensor zero point, making the measurement inaccurate.Install pressure transmitters according to the manufacturer's datasheet and check the zero after installation.VibrationsCan affect measurement stability and shorten sensor life.Use anti-vibration mounts to minimize impact. Use vibration-resistant pressure transmittersSupply voltageVoltage variations may alter measurements or damage the sensor.Prefer sensors with a wide power supply range for better tolerance.

Precision factors for pressure transmitters and recommendations

By choosing Fuji Electric pressure transmitter FCX, you can ensure the accuracy of your pressure measurements on your industrial processes. Your plants and facilities operate more safely and efficiently, producing higher quality products and reducing downtime. You can rely on reliability and robustness of Fuji Electric's pressure transmitters to deliver accurate, repeatable measurement.

For optimum measurement accuracy, our technicians offer commissioning of your pressure transmitters . You can be sure that your devices are ready for use and that your installations start up under the best conditions.

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Pressure Transducers are often used in industrial applications; we have a whole range of products which could suit applications in this field. But which one do you choose for the job?

There are many factors which should be taken into consideration when selecting the right pressure sensor; we have selected the top 5 things to evaluate to help you find the best product for your needs.

Pressure Range

This is the most important factor to consider because if a pressure transducer is operating in the wrong range, it will not function correctly for your application. Choosing too high a range would mean only using a small part of the output, too low a range could leave the sensor susceptible to pressure spikes. 50 to 75% of the range is common. The operating pressure range is usually given in bar or mbar, we can also calibrate to a psi scale.

All of the information required about pressure ranges, whether gauge, absolute or differential can be found on the individual product data sheets of our pressure transducers. Alternatively, you can call us to discuss your application and we will help you determine the right sensor for you.

Accuracy

The level of accuracy you require will once again depend on your application. This will depend on the individual sensor.

The accuracy of our pressure transducers can be found on the product data-sheet. If your application requires very high accuracy it&#;s best to choose a pressure sensor which offers ±0.1% accuracy.

Temperature

The operating temperature range is another consideration to take into account when selecting a pressure sensor. Some pressure transducers are able to withstand high surrounding temperatures without their performance being affected whereas others may not be so durable in this area.

Finding out the operating temperatures of the pressure transducers and comparing this with the expected temperatures of your given environment is an important process before purchasing your sensor.

Material

The external factors within the application will have an effect on what material you need to select for your pressure transducer. It is important to find a material strong enough to withstand the environment it is operating in. For example; can the material be exposed to elements such as seawater; tap water; nitrogen; compressed air or oxygen without corroding?

Most of our pressure transducers are constructed of stainless steel as this is strong and rugged making the sensors well-suited to applications in demanding environments.

Environment

The environment of the application must be examined closely before a pressure transducer is selected. Some working factors could have an effect on how the sensor operates. How much shock and vibration will the pressure sensor be exposed to? Is the space restricted in the environment? If so a smaller pressure transducer may be the best option.

All of the specifications to help you select your pressure sensor can be found on the individual product datasheets which are available for download by visiting the pressure sensor section of our website.

If you are looking for more details, kindly visit pressure level transducer.