High Inrush Current Protection for Industrial Equipment

Large power users require mitigation of inrush currents as part of overall energy management strategy. Industrial automation with motor drives and logic controllers, high voltage power supplies feeding industrial robotics and solar panel arrays with large capacity power inverters all require inrush current limiting.     Overview   Inrush current is the momentary surge of current created when power is turned on to motors, transformers, power supplies and heating elements. … Continue Reading

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Arduino and Thermistors – The Secret to Accurate Room Temperature

We’ve made a discovery and wanted to share it with you; introducing the Arduino Uno. If you’re an electronics geek who’s been wanting to learn more about the vast community of “Hardware Hackers” out there, read on! We discovered that you could hack together some awesome stuff with an Arduino Uno and other electrical components such as thermistor temperature sensors. And when you combine the Arduino and thermistors the possibilities are endless. We … Continue Reading

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Thermistor Fan Control in Gaming Applications

A New Application Thermistors are expanding in their applications every day. This year, EVGA, an American computer hardware company, redesigned its leading cooler to better monitor and cool power components in addition to the Graphics Processing Unit (GPU) component. In order to accomplish this, EVGA introduced Negative Temperature Coefficient (NTC) thermistors to its Printed Circuit Board (PCB). These NTC thermistors express large decreases in resistance in response to small increases … Continue Reading

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Overloaded Circuit Board? Clean House with our New UL Certified SL12 10006

We couldn’t keep it a secret any longer. Finally, a UL approved circuit protection thermistor (Inrush Current Limiter) that’s just 12.3mm in diameter but packs an energy rating of 40 (J), yes; we said 40 (J) plus a maximum continuous current rating of 6.0A. Meet our upgraded UL certified SL12 10006 for limiting inrush current. We think this device is a game changer! Up until now if an application required … Continue Reading

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Limiting Heat Lamp Inrush Current Protects Relay Contacts

Limiting Heat Lamp Inrush Current Incandescent heat lamps create a large inrush current when first powered on. Limiting heat lamp inrush current prevents relay damage and extends lamp life. Heat lamps can be used to warm enclosed areas such as livestock pens and chicken coops. Banks of incandescent heat lamps are mounted overhead. As the number of heat lamps increases, limiting heat lamp inrush current becomes more important. Over current can damage relay contacts in … Continue Reading

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5 Thermistor Sensor Considerations When Selecting An NTC Thermistor

These 5 thermistor sensor considerations will make selecting the right NTC thermistor easy Selecting a thermistor temperature sensor can be confusing, and you have a lot of options to choose from. You don’t want to risk equipment failure or circuit breaker short-outs. So, how do you make the right selection without sacrificing performance and giving up quality? See what the 5 thermistor sensor considerations are all about to find out!   … Continue Reading

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Limit AC Motor Inrush Current

Limit Inrush Current In AC Motor Air Conditioning Application AC motors used in air conditioning equipment draw large inrush current at power-on. A recent customer of ours had a 115-VAC air conditioner installed in their travel trailer for park use. This 5,000-BTU unit required 16 amps for simultaneous compressor and blower motor operation. The trailer was also equipped with a load-shedding power distribution panel to protect its wiring harness from overload. If more … Continue Reading

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Thermistor Temperature Sensor Blog Archive

Thermistor Sensor Blog Archive The thermistor sensor blog archive contains articles relating to temperature measurement, compensation, and control.

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Inrush Current Blog Archive

Inrush Current Blog Archive The inrush current blog archive contains articles relating to inrush current, it’s causes, cures, and prevention. Inrush Current Limiting  

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Glass-Encapsulated Thermistors For Automotive and Industrial Applications

Application Overview Ametherm’s DG series glass-encapsulated thermistors provide long-term stability and reliability for high-accuracy temperature sensing in automotive and industrial applications. Hermetically sealed, the thermistors eliminate errors in resistance readings due to moisture penetration, while offering high operating temperatures and a compact size. DG Series Application Benefits Provide faster, more-accurate, and less-expensive alternatives to thermocouples and RTD probes Free from limitations due to solder temperature, which enables them to offer … Continue Reading

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Thermal Time Constant and NTC Thermistors: A Practical Study

The Relationship between Thermal Time Constant and Temperature Sensors In this article, we’ll break down the relationship between the thermal time constant and NTC thermistors. We’ll also cover the importance of selecting the right thermistor with characteristics that will produce the correct thermal time constant for your application. Further down in this article, we demonstrate one way to measure thermal time constant; running two tests, then present the results. What is Thermal … Continue Reading

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Temperature Sensors – Thermistors versus Thermocouples

Temperature Sensors – Thermistors vs Thermocouples We Weigh the Pros and Cons of Each Type of Temperature Sensor Thermistors vs Thermocouples. They’re both good choices for temperature measurement and temperature control applications depending on your application requirements. For electrical engineers faced with the task of managing one or more temperature detection circuits, choosing the right temperature sensing device for a Printed Circuit Board (PCB) can be confusing. When you go … Continue Reading

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Calculate Inrush Current in Three Steps

Why do I need to Use Inrush Current Calculators to Select an Inrush Current Limiter? An Inrush Current Limiter (ICL) can protect electrical equipment from overheating at switch-on due to inrush current. And, because inrush current equals the maximum instantaneous surge of incoming current from a power source, it can equate to as much as 2-3 times the steady state current of the attached device. So, Inrush Current Calculators are the … Continue Reading

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Thermistor – Temperature Detection Fire Alarm Example

Thermistors serve a crucial role in temperature detection. For example, thermistor temperature detection can be used in fire alarms to detect fires based on a sudden change in temperature. Unlike photoelectric detectors or ionization alarms, thermistors only require heat to activate. Thermistors are temperature-sensing elements made of semiconductor material that displays large changes in resistance in proportion to small changes in temperature. Photoelectric and Ionization Fire Alarms The photoelectric detector requires heavy smoke … Continue Reading

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Alternative Energy Applications for MS35 Inrush Current Limiters

Application Overview Ametherm’s MS35 series inrush current limiting thermistors play a key role in alternative energy applications by avoiding current spikes in the power generated by wind turbines, solar panels, and other sources as it’s fed into batteries, inverters, and other energy storage components. The MS35 devices are also used to regulate the release of battery energy in electric vehicles and in pre-charge circuits for many different types of battery … Continue Reading

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Toroidal Transformer Inrush Current Issues Got You Down? We’ve Got the Answer

What You Need to Know About Toroidal Transformer Inrush Current Toroidal Transformer Inrush Current can cause some serious damage if not appropriately managed. Inrush current can cause circuit breakers to trip and fuses to blow. Additionally, it can cause a complete failure of the transformer itself. And if that weren’t enough to give you a headache, excessive inrush current can also limit the total number of devices which can be … Continue Reading

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The Secret To Successful Thermistor Beta Calculations

What Do RT1, RT2, T1, and T2 Have In Common? They are the main components of Thermistor Beta Calculations as it relates to temperature measurement, compensation, and control. And if you are an engineer in an industry such as automotive or HVAC where things like coolant and air intake temperatures are crucial to the safety and performance of a vehicle or unit, chances are you will deal with beta calculations … Continue Reading

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How to Limit DC Motor Inrush Current

Choosing An Inrush Current Limiter To Preserve Your DC Motor So, what does an Inrush Current Limiter have to do with DC motor inrush? More than you may think. DC motor inrush is the maximum, instantaneous input current drawn by the DC motor when first turned on and it is important to know how to limit the inrush current to prevent possible damage to the motor. A DC motor converts electrical energy … Continue Reading

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NTC Thermistors Used In Tesla Hyperloop Pod

Award-Winning Hyperloop Pod Uses NTC Thermistors A team of engineers use NTC thermistors in their design for a high-speed transportation pod.  The thermistors accurately sense temperatures and create a map of the application’s heat. Teslarati recently conducted an interview with members of the Badgerloop team, 3rd-place winners of SpaceX’s Hyperloop Pod design competition in January.  The Hyperloop is Tesla CEO Elon Musk’s “fifth mode” of transportation where passengers in a … Continue Reading

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Design Guidelines for a Power Factor Correction (PFC) Circuit Using a Capacitor and an NTC Thermistor

Objective Ametherm inrush current limiters are used in many applications today that require suppression of surge current when power is first applied to the system. One of the popular applications of Ametherm inrush current limiters is in power factor correction circuits. This article provides a solution for finding the correct power factor correction (PFC) circuit for an inductive load. This solution is suitable for applications such as ballasts, LED drivers, … Continue Reading

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Enabling Higher Power Efficiency through Thermistor-based Temperature Compensation

By Balaji Santhanam, Hubble Power Systems Mehdi Samii, Ametherm Inc. Originally Published in Power System Design  Magazine  As electronic systems continue to become more compact, temperature plays an increasingly important role in system reliability and power efficiency.  Many engineers are already familiar with how temperature can affect reliability; if a system becomes too hot, device operation can become unpredictable.  Using a simple temperature sensor like a thermistor, the host processor can monitor … Continue Reading

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Thermistors used to Measure Temperature in Lake Tahoe

Recently, the SFGate released an article about how thermistors are used to measure temperature change in Lake Tahoe. The article states that over the past 40 years, global warming has caused the temperature of lakes to rise, affecting the natural habitat for fish species and algae blooms. Scientists at the Tahoe Environmental Research Center carefully monitor the lake’s temperature using thermistors carried by large ocean buoys. Signals from the buoys transmit data via satellite to scientists at NASA’s Jet Propulsion Laboratory in … Continue Reading

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ACCU-CURVE™ Thermistors for High Accuracy Temperature Sensing

What’s an ACCU-CURVE™ Thermistor? ACCU-CURVE™ thermistors are used for high-accuracy temperature sensing, control, and compensation in medical, industrial, and automotive applications. They also deliver long-term stability and reliability, while offering interchangeability over a broad temperature range. This eliminates the need to individually calibrate or provide circuit compensation for part variability. Accurate temperature measurement to ±0.2°C is available over the 0°C to 70°C temperature range. Standard ohmic values at 25°C range from 2,252 to 100,000 ohms. ACCU-CURVE™ Thermistor vs. … Continue Reading

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Temperature Sensor for Control and Compensation Circuits

To use a temperature sensor in a control or compensation circuit, the detection circuit must provide an output in a usable format.  For analog circuits, the output is usually a resistance.  For digital control and compensation, the measurement needs to be converted to a digital format for processing by an MCU.  This is commonly achieved by reading the measurement as a voltage using an analog to digital converter (ADC). Semiconductor-based sensors … Continue Reading

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Follow Ametherm on Social Media!

The time has come for Ametherm to go digital! While pen and paper remain true to our hearts, the engineers here at Ametherm want to share their wealth of the research, development and knowledge of inrush current limiters and thermistors at a more consistent and rapid pace. What better way than to… tweet it? Or, share it on Facebook.     Like us on Facebook!     Follow us on Twitter!    … Continue Reading

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How to Select the Optimal Temperature Sensor

When designing a temperature detection circuit, it is important to not pay for more than is actually needed.  By understanding the requirements of an application, an optimal temperature sensor can be selected that minimizes cost without compromising performance, accuracy, or reliability. There are several factors to consider when selecting a sensor. They are outlined in the table below. Temperature Sensor Selections   NTC Thermistor Platinum RTD Thermocouple Semiconductor Based Temperature … Continue Reading

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4 Most Common Types of Temperature Sensor

A temperature sensor plays an important role in many applications.  For example, maintaining a specific temperature is essential for equipment used to fabricate medical drugs, heat liquids, or clean other equipment.  For applications like these, the responsiveness and accuracy of the detection circuit can be critical for quality control. More frequently, however, temperature detection is part of preventative reliability.  For example, while an appliance may not actually perform any high … Continue Reading

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ACCU-CURVE™ Series of Interchangeable Thermistors

We are excited to announce that we are now offering ACCU-CURVE™ series thermistors. These are a new series of interchangeable thermistors used for temperature sensing, control, and compensation. They are best suited for applications that require a high degree of measurement accuracy over a wide temperature range. Common applications include medical, industrial, and automotive. Read the full press release here. Why choose the ACCU-CURVE™ series? The ACCU-CURVE™ series offers faster … Continue Reading

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NTC Disc Thermistors Available at Rhopoint

We have exciting news! U.K.- based Rhopoint Components now carries our series of NTC disc thermistors acquired from Measurement Specialties (formerly RTI electronics). These components deliver high stability and maximum sensitivity for temperature measurement, compensation, and control. You can read the full press release here. NTC Disc Thermistor Applications NTC disc thermistors offer extreme precision and temperature measurement for various applications. They are used in a wide range of industries including aerospace, military, appliance, medical, and automotive. … Continue Reading

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Transformer Inrush Current: Limiting a 40VA Transformer

Have you ever turned on a transformer and heard a loud humming sound? What about having a blown fuse or tripped circuit breaker? These signs can all indicate transformer inrush current. Transformer inrush current describes a spike in current that occurs when you initially turn on your transformer. This spike can be up to 10 times higher than normal current. Why does inrush current occur?  It can happen because large transformers demand a huge amount … Continue Reading

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PTC Thermistors vs. NTC Thermistors for Inrush Current

Today we’re going to cover how you can improve inrush current protection for your equipment, machinery or system using NTC and PTC thermistors. Inrush current affects a wide range of products. It becomes further complicated by systems that switch on and off quickly, such as welding equipment and HVAC systems. This post will give you a brief overview of the topic. For more information, you can read the full article here. What … Continue Reading

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Behind the Scenes: Creating a Custom Thermistor Probe

Recently, we put out a press release Customization Capabilities for NTC Thermistor Probe Assemblies announcing our ability to create customized NTC thermistor probe assemblies to fit the specific needs of any application. In today’s blog post, we are going to give you a behind the scenes look at one of our custom designs. Let’s get started! More than two years ago the team at Ametherm began working on a custom probe to … Continue Reading

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Ametherm Adventures: Lenze Supplier Day

Ametherm was thrilled to receive an  invitation from Lenze Americas to attend the first Lenze Supplier Day. The event was held at Lenze’s North American Headquarters in Uxbridge, Massachusetts on September 24, 2015 and featured attendees from their 20 top suppliers. The agenda included several presentations with key-information on lean manufacturing, quality expectation and global commodities strategies. Between sessions the group took a tour of the manufacturing facilities and participated in … Continue Reading

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