Temperature Assemblies
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Thermowells
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RTD Temperature SensorsResistance Temperature Detectors (RTDs)Resistance Temperature Detectors are sensors that measure temperature by correlating the resistance of the RTD element with temperature. Most RTD elements consist of a length of fine coiled wire wrapped around a ceramic or glass core. The element is typically relatively fragile, so it is generally installed inside a sheath to protect it. The RTD element is constructed from a pure material, the resistance of which, at various temperatures, has been documented by various international standards institutes. The material has a predictable change in resistance as the temperature varies; it is this change that is used to determine temperature. RTDs are generally considered to be among the most accurate temperature sensors available.In addition to providing very good accuracy, they feature excellent stability and repeatability. RTDs also provide high immunity to electrical noise and are, therefore, well suited for applications in process and industrial automation environments, especially around motors, generators and other high voltage equipment.Ultra manufactures an almost infinite variety of RTD sensors and assemblies, and most can be supplied in 48 hours or less. Options include combinations of different element materials, values and accuracies, a choice of element leadwire configurations, and a selection of sheath materials and diameters. Many of our RTD assemblies are supplied in drilled or flanged wells, and all assemblies can be supplied with our economical, head mount or DIN-rail mounted transmitters. If you can’t find a catalog RTD for your application, just contact us – custom versions can often be fabricated in less than a week!Typical RTD applications
include:
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Thermocouple Temperature Sensors A thermocouple consists of two dissimilar metals, joined together at one end. When the junction of the two metals is cooled or heated a voltage is produced that can be correlated back to the temperature. Most thermocouple alloys are commonly available as wire. Thermocouples are manufactured in different combinations of metals and/or calibrations. The calibrations most regularly specified by Ultra Electronics, NSPI customers are J, K, T and E. High temperature calibrations include R, S, C and GB. Each calibration has a different temperature range and environment, although the maximum temperature varies with the diameter of the wire used in the thermocouple. While the thermocouple calibration defines the temperature range, the maximum range will also be a factor the diameter of the thermocouple wire. Therefore, a very thin thermocouple may not reach the full temperature range. Since thermocouples measure wide temperature ranges and are
relatively rugged, they are very often used demanding
industrial automation and process control applications. In
selecting a thermocouple, the following criteria are key
considerations: We manufacture a broad variety of thermocouple components and assemblies for use in virtually all high temperature, industrial and process temperature measurement applications. Today, Ultra Electronics, NSPI thermocouples are among the most widely used in the world for applications such as forging, smelting and melting, heat treating, incineration and cogeneration, utility and waste boilers and multiple other severe use processes. Many of our assemblies are supplied in either drilled or flanged wells, and all assemblies can be supplied with our economical, head mount or DIN-rail mounted transmitters. If you can’t find a catalog thermocouple for your application, just contact us – custom versions can often be fabricated in less than a week! Typical T/C Applications: |
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Connection Heads
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Temperature
Transmitters
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