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Summary: Three broad types of measuring applications are discussed: (i) surface temperature, (ii) air and gas and (iii) liquid, but other applications are also possible, with different configuration combinations.
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Summary: Products that contain thermistors usually carry a warranty. Find out how to determine the reliability of a thermistor in that product by doing a calculation. The equation - mean time before failure or MTBF - is demonstrated.
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Summary: There are factors to consider when choosing an inrush current limiter, of which three of the more common ones include energy rating, maximum inrush current and voltage. An example of a pre-charged circuit is used to illustrate.
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Summary: Explains what an NTC thermistor is and its capabilities as a temperature sensor. Ametherm's NTC thermistors and probes are described, as well as the terminology used.
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Summary: Explains (i) passive or active protection for inrush current, (ii) surge limiters (iii) available types of inrush current limiting thermistors, (iv) cool down time and other uses (v) advantages of NTC thermistors over active circuits and (vi) combining NTC thermistors and active circuits.
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Summary: Find out how a surge limiter can protect equipment from inrush current when power is turned on, and how surge limiters have an advantage over fixed resistors.
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Summary: Three factors to consider are energy rating, maximum inrush current and resistance. An example showing a step-by-step calculation using a pre charge circuit is given.
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Surge Current Causes and Prevention - Inrush Current Limiters
Summary: High inrush current can affect electrical systems by tripping fuses and circuit breakers. This makes inrush current protection a necessity. Ametherm's NTC thermistors - called inrush current limiters - are the perfect solution.
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Summary: Explains thermal time constant - a key element in NTC thermistors. Shows a diagram that can be useful if your application requires frequent on/off switching.
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Summary: What kind of thermistor would reduce inrush current in a 2.0KVA transformer with certain specifications? Find out by following the detailed calculations provided in this article.
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Summary: In using NTC thermistors to obtain accurate measurements, a phenomenon called "immersion stem effect" can occur. This article defines it and how it can be eliminated.
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Summary: Explains why the beta value, although often used, is not as accurate as using the Steinhart and Hart equation. The Steinhart and Hart equation uses three temperatures over a given range.
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Summary: Calculating power dissipation can lead to errors, causing an inaccurate correlation between voltage reading and temperature. One solution is to use a bridge diagram which has a linear voltage-temperature characteristic, as opposed to using the temperature-rsistance curve which is non-linear and much harder to use.
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Summary: This equation is arguably the best equation to use when determining the resistance temperature relationship of NTC thermistors and NTC probe assemblies, given that the equation uses three temperatures. This article tells you which equation to use in your particular application.
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Summary: The Wheatstone Bridge is one of the easiest ways to measure temperature and explains how it is calculated using a specific example with certain variables. A chart of temperature versus volts is also provided.
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Summary: This article provides you with an equation you can use to calculate a thermistor's temperature coefficient. The temperature coefficient is the change that occurs in the resistance with a change in temperature. A useful and frequent customer example is provided.
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Summary: Metals like coils and solenoids often present problems involving temperature compensation. In an automotive application, you can minimize this problem by using a total resistance equation and a linearization equation. A step-by-step calculation will guide you.
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Summary: When you use one thermistor to limit inrush current, there is no need to calculate a thermistor's energy handling capability. With two and more thermistors, however, you need to perform a calculation so that the energy does not exceed its rating. A worst case hypothetical example is provided with voltage drops to arrive at total energy.
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Summary: Provides the key factors to consider when choosing a thermistor: (i) size and type (ii) thermistor features (iii) application or intended use (iv) resistance temperature curves (v) tolerance limits (vi) interchangeability and (vii) calibration. This article also briefly explains linear response elements versus thermistor probes.
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Summary: Explains the fundamentals regarding NTC thermistors, and commercial and military grade NTC thermistors.
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Summary: Type and size of thermistor, resistance-temperature curves, nominal resistance value, resistance tolerance and beta tolerance are few of the things to consider before deciding which thermistor is the most appropriate for your needs.
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Inrush
Current Applications