![]() By contrast, price is probably less critical for a medical instrument sensor, but high accuracy, resolution and noise immunity is usually essential.ĭifferent applications will make varying demands on a sensor’s accuracy. ![]() For example, a home thermostat does not need very high accuracy, but it should be low-cost for high volume production. Sensors’ profiles in terms of these parameters can be compared with an application’s requirement specifications to identify the best fit. Sensors are characterised by many parameters, which can be broadly classified into electrical, physical and environmental types. Consider your application, and match your sensor to it We finish by highlighting some currently available kits and hardware that you can use to get started with your sensor system design. Armed with these comparative profiles, we proceed to look at some more in-depth practical considerations approaches to take and points to consider when designing these sensors into real applications. We then review the different sensor types available, so that their comparative benefits and drawbacks become apparent. When initially considering temperature sensor types for integration into a new application, the first questions relate not so much to how ‘good’ a sensor may be – that will come later – but rather to how well matched to the application it is.Īccordingly, we start by looking at the factors that dictate which sensor type is best for any given application. ![]() This article is intended to help engineers tasked with designing temperature sensors into their systems, whether for direct monitoring or control, protection against overheating, or calibration of other temperature sensitive sensors or system components such as gas and flow meters. Overcoming these challenges and integrating the sensors into CPU-based control or monitoring systems requires expertise in analogue and digital circuit design, and firmware development. While methods for using these are well-known, the challenge comes when attempting to measure with an accuracy of better than 0.5☌ or 0.1☌. The most commonly-used devices for electrically measuring temperature are thermocouples, temperature-dependent resistance elements – RTDs and thermistors – and semiconductor diode elements. Temperature is the most frequently measured parameter in the world, yet it is difficult to measure accurately.
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