Temperature measurement

Readwin software can be easily downloaded from the Endress+Hauser website. Simply search for ‘Readwin 2000’ in the searchbar of the website, download links can be found on the right side of the Readwin page.

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Both RTD’s and thermocouples can be used for temperature measurement and each have their own characteristics which will suit different applications and requirements better. RTD’s offer increased levels of accuracy, only require one point of measure and are more cost effective to install overall. Thermocouples offer faster response times, a smaller surface area and can measure much higher temperatures. If you would like to find out more, get in touch.

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Thin film and wire wound sensors are both RTD measuring elements and measure temperature in the same way. Wire wound sensors are constructed by platinum wire being wound around a ceramic element to create an RTD. Thin film elements are created by applying a platinum track across a section of GRP board. Thin film elements are much smaller therefore easier to embed or place in different and varied applications however they are often limited by a smaller measurement range than wire wound sensors.

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Thermowells aren’t always necessary in temperature measurement but offer more flexibility on the application of a temperature device. Through the inclusion of a thermowell, a probe can be removed from a process for calibration or repair while keeping the process sealed, they can offer physical protection for the delicate measuring element of an RTD or thermocouple and can be used to alter the resonant frequency of a temperature device when the wake frequency of a medium could cause damage.

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In a 3 wire RTD set up, compensation of this additional resistance is created by measuring the resistance of one wire outside of the RTD element, and duplicating it to represent both wires for subtraction from the overall resistance. In a four wire set up, measurement of both linking wires is made and used for compensation, reducing the potential for error that can occur if resistance of the two wires differs. Contact our experts to learn more.

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