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Sensors

5 Posts authored by: Labfacility Limited
The NTC Thermistor is an alternative to the Platinum resistance thermometer; the name derives from “thermal resistor” and defines a metallic oxide which displays a high negative temperature coefficient of resistance. This compares with the small positive coefficient of say Platinum used for the Pt100 sensor. The temperature-resistance characteristic of the thermistor is up to 100 times greater than that of the alternative resistance thermometer and provides high sensitivity over a li ...
Temperature calibration provides a means of quantifying uncertainties in temperature measurement in order to optimise sensor and/or system accuracies.   Uncertainties result from various factors including:   a)         Sensor tolerances which are usually specified according to published standards and manufacturers specifications. b)         Instrumentation (measurement) inaccuracies, again specified in m ...
Connections between the thermocouple or Pt100 and associated instruments may involve a physical interface with installed wiring and/or sensors. Such interfaces take the form of special connectors, terminal strips, barrier blocks and extension cables. Due to their location in often adverse environments such as hot working zones of furnaces and machinery, temperature sensors are liable to corrosion and mechanical damage. The need for occasional replacement is inevitable and the use of suitable pol ...
Sheath materials range from mild and stainless steels to refractory oxides (ceramics, so called) and a variety of exotic materials including rare metals. The choice of sheath must take account of operating temperature, media characteristics, durability and other considerations including the material relationship to the type of sensor. The application guide below provides details of various commonly specified sheath materials.   Sheath Material Maximum Continuous Temperature Notes Applicatio ...
The relatively new Type N thermocouple represents the single greatest advance in thermocouple thermometry in recent years. The dominant, well established Type K thermocouple has, for many years been the industry standard general purpose, high temperature (up to 1100oC) sensor world-wide.   In fact, type N offers superior performance and reliability to Type K in all applications and should be considered as an alternative when specifying new installations. Type N has very good thermoelectric ...

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