The calibration of pressure transmitter is an essential step in guaranteeing the accuracy and quality of measurements. It is the a process used to adjust and check the performance of a pressure transmitter or sensor against a standard reference.
Does the calibration of a pressure transmitter or pressure transducer seem complicated? You may be wondering why these terms are so crucial in the world of measurement and pressure?
In this article, we take a look at the calibration process, its importance, and how it helps to improve the accuracy of measuring instruments. You'll also discover the nuances associated with calibration and the key steps to ensuring reliable results.
Calibration is the process of comparing the performance of a measuring instrument, such as a pressure transmitter, with that of a reference standard. This step is crucial to ensure that the instrument works properly and provides accurate measurements. In the context of pressure transmitters, a calibration is used to determine the difference between the instrument's measurement and the actual value.
Pressure transmitters and sensors are used in a wide range of applications, from commissioning industrial equipment to monitoring manufacturing processes. A small error in measurement can have serious consequences, particularly in terms of quality, safety and performance. Calibration ensures that these instruments operate with the required accuracy, minimising the risks associated with inaccurate measurements in the measurement chain.
A correctly calibrated pressure transmitter or transducer ensures optimum performance. This not only ensures accurate measurements, but also greater efficiency in the applications where these instruments are used.
Incorrectly calibrated instruments can lead to costly errors, particularly in terms of wasted resources or production faults. By investing in regular calibration, you can avoid these additional costs in the long term.
Many industries have strict standards for measurement accuracy. Regular calibration ensures that your instruments meet these standards, avoiding penalties or compliance issues.
In some industries, such as the chemical, oil & gas or nuclear sectors, accurate measurements are essential for safe operations.
Optimising performance
Cost reduction
Comply with standards and improved product quality
Operational safety
There are different types of pressure transmitters, each with its own applications and calibration requirements. For example, an absolute pressure transmitter measures pressure relative to a perfect vacuum, the gauge pressure transmitter measures pressure relative to atmospheric pressure, while a differential pressure transmitter measures the pressure difference between two points.
Each type requires a specific calibration procedure to ensure accurate measurements.
How often you need to calibrate your pressure transmitters depends on a number of factors, including use, working environment and industry standards.
Some instruments may need to be calibrated monthly, while others may need to be calibrated every 1 to 3 years. It is essential to follow the manufacturer's recommendations and industry standards to determine the appropriate calibration frequency.
An on-site calibration is carried out directly at the point where the instrument is used, whereas a laboratory calibration is carried out in a controlled environment on a pressure bench.
Field calibration is often preferred for instruments that are difficult to move or that are essential to the production process.
On the other hand, laboratory calibration offers advantages such as generally better accuracy thanks to more stable equipment and conditions.
The calibration process begins by placing the instrument on a calibration bench. The instrument is then subjected to various pressure values, from zero (or vacuum) to its maximum measurement range.
At each stage, the instrument's measurements are compared with those of a reference standard. If deviations are observed, the instrument is adjusted accordingly.
Before starting calibration, it is crucial to prepare the instrument. This involves checking its general condition, its components, ensuring that it is clean and allowing it to acclimatise to the calibration environment (temperature, humidity, atmospheric pressure) for an appropriate period.
Install the transmitter in a stable location, free from vibration or movement.
Set the zero position of the transmitter. This is crucial because the calibration position may differ from the actual installation position. Ignoring this step could result in inaccuracies. Prestress the sensor diaphragm before calibration. This involves applying a pressure of approximately 90% of full scale. For example, for a 10 bar sensor, increase the pressure to around 9 bar. Hold this pressure for half a minute and then release. This step ensures greater accuracy during calibration.
The reference standard or test equipment must be at least four times more accurate than the instrument being calibrated. It is essential to ensure that the standard itself has been recently calibrated and complies with the required standards.
The calibration procedure varies according to the type of sensor or transmitter. However, in general, the instrument is subjected to a series of 3 known pressures (0%, 50%, 100% corresponding to 4mA, 12mA and 20mA for a 4-20mA output signal) on the way up and down, and its readings are compared with those of the reference standard.
Allow each test point to stabilise before moving on to the next, usually at least 30 seconds.
If necessary, use 5 points for greater accuracy. If deviations from the reference calibrator are observed, adjustments are made until the instrument gives accurate readings.
Calibration is not simply a matter of comparing measurements. It requires a thorough understanding of equipment, procedures and standards.
Make sure that the technicians who carry out the calibration are properly trained and up to date with the latest techniques and standards.
If you need help, you can call on a company offering calibration services, or request training on measuring instruments from a specialist firm.
Not all measuring instruments are created equal. It is essential to choose a high quality pressure transmitter and adapted to your specific needs to guarantee accurate results.
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The calibration of pressure transmitters is much more than a simple routine or formality. It is essential to the safety, quality and efficiency of many industrial processes. By understanding the importance of calibration and following the appropriate steps, you can not only ensure the accuracy of your equipment, but also extend its life and optimise its performance.
Remember, precision is at the heart of efficiency. By investing time and resources in the regular calibration of your equipment, you're investing in the quality and reliability of your operations. So the next time you think about calibration, remember its crucial role and the benefits it brings to your business.
Our pressure transmitters and calibration services will help you solve your measurement problems.
To find out more about our products and benefit from a free consultation, contact our team of experts today.
Calibrating a pressure transmitter involves comparing its measurements with those of a reference standard, then adjusting the transmitter according to the differences observed.
Calibrating a transmitter is the process of checking and adjusting its accuracy by comparing it with a reference standard.
Calibration ensures that the transmitter operates correctly and provides accurate measurements, which is essential for the quality, safety and efficiency of industrial processes.
Calibrating a pressure transmitter is identical to calibrating a sensor. It involves comparing the transmitter's measurements with those of a reference standard and adjusting the transmitter accordingly.
The calibration procedure depends on the type of instrument. It generally involves preparing the instrument, selecting an appropriate reference standard, then comparing the measurements of the instrument with those of the standard and adjusting accordingly.
