Last updated on Feb 5, 2024
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Choose the right sensor
2
Use signal conditioning
3
Apply calibration and compensation
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Implement error detection and correction
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Optimize sensor placement and orientation
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Here’s what else to consider
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Sensors are essential components of automation systems, as they provide feedback on the status and performance of various devices and processes. However, sensors are not perfect, and they can be affected by noise, interference, calibration errors, or environmental factors. How can you increase the accuracy of sensors in automation systems? In this article, we will explore some tips and techniques that can help you improve the quality and reliability of your sensor data.
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- Alef Mariano Projetista Elétrico na Gali Energia | Engenheiro de Segurança do Trabalho
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1 Choose the right sensor
The first step to increase the accuracy of sensors is to choose the right sensor for your application. Different types of sensors have different advantages and disadvantages, such as sensitivity, range, resolution, response time, or cost. You should consider the specifications and requirements of your automation system, and select the sensor that best suits your needs. For example, if you need to measure temperature, you can use a thermocouple, a thermistor, or an infrared sensor, depending on the accuracy, speed, and distance you need.
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- Khalid Kamal Electrical Automation Technician (Maintenance) at Packaging Products Company Riyadh (Saudi Arabia)
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To enhance sensor accuracy in automation systems, consider calibrating sensors regularly, minimizing environmental interference, using redundant sensors for cross-verification, and implementing advanced signal processing algorithms to filter noise and improve precision. Additionally, proper maintenance and ensuring sensors operate within specified conditions can contribute to accuracy improvements.
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2 Use signal conditioning
Signal conditioning is the process of modifying the output signal of a sensor to make it more suitable for further processing or analysis. Signal conditioning can include amplification, filtering, isolation, linearization, or conversion. Signal conditioning can help you increase the accuracy of sensors by reducing noise, enhancing signal-to-noise ratio, compensating for nonlinearity, or matching the signal level and format to your data acquisition system. For example, if you use a strain gauge to measure force, you can use a Wheatstone bridge to amplify the small voltage change, and a low-pass filter to remove high-frequency noise.
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- Alef Mariano Projetista Elétrico na Gali Energia | Engenheiro de Segurança do Trabalho
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O condicionamento de sinal em um sistema de automação refere-se ao processo de manipulação e preparação dos sinais elétricos ou eletrônicos que são gerados por sensores, transdutores ou outros dispositivos de entrada. Isso é feito para garantir que os sinais estejam na forma correta e dentro das especificações necessárias para serem processados e utilizados por outros componentes do sistema, como controladores, PLCs ou sistemas de monitoramento.O condicionamento de sinal pode envolver amplificação, filtragem, isolamento, conversão de sinais analógicos para digitais, linearização e compensação de temperatura, entre outras técnicas.
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3 Apply calibration and compensation
Calibration and compensation are methods of correcting the errors and deviations of a sensor from its ideal behavior. Calibration is the process of comparing the output of a sensor to a known standard or reference, and adjusting the sensor or its output accordingly. Compensation is the process of applying mathematical formulas or algorithms to the sensor output to account for the effects of external factors, such as temperature, humidity, or pressure. Calibration and compensation can help you increase the accuracy of sensors by eliminating systematic errors, improving repeatability, and increasing stability. For example, if you use a pressure sensor to measure fluid flow, you can calibrate it against a manometer, and compensate for the temperature variation using a lookup table or a polynomial function.
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4 Implement error detection and correction
Error detection and correction are techniques of identifying and correcting the errors that may occur during the transmission or storage of sensor data. Error detection and correction can help you increase the accuracy of sensors by ensuring the integrity and validity of your data. There are different methods of error detection and correction, such as parity bits, checksums, cyclic redundancy checks, or error-correcting codes. For example, if you use a wireless sensor network to monitor environmental parameters, you can use a Hamming code to detect and correct any bit errors that may happen due to interference or noise.
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5 Optimize sensor placement and orientation
Sensor placement and orientation are factors that affect the accuracy of sensors by influencing the quality and quantity of the input signal. Sensor placement and orientation can help you increase the accuracy of sensors by maximizing the signal strength, minimizing the interference, and avoiding the sources of error or distortion. You should consider the physical characteristics and constraints of your automation system, and position and align your sensors accordingly. For example, if you use a light sensor to control the brightness of a lamp, you should place it away from direct sunlight, and orient it perpendicular to the light source.
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6 Here’s what else to consider
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