At Focusens, we know that thermistors are more than just components; they are the heart of temperature sensing applications that keep our world functioning smoothly. Among the two main types, NTC (Negative Temperature Coefficient) and PTC (Positive Temperature Coefficient) thermistors, understanding how to identify them is key to selecting the perfect fit for your needs. Let’s dive into their unique characteristics and the methods to distinguish between them. What Are Thermistors? Thermistors are temperaturesensitive resistors that change their resistance in response to temperature fluctuations. This remarkable property makes them ideal for a variety of applications, from motors humming to life in factories to the everyday appliances in our homes. Exploring NTC and PTC Thermistors NTC thermistors are fascinating in their behavior: as temperatures rise, their resistance drops. This makes them perfect for applications like precise temperature sensing, inrush current limiting, and overcurrent protection. In contrast, PTC thermistors work their magic differently. As temperatures increase, their resistance rises. They are often the unsung heroes in motor protection, selfregulating heaters, and temperature control systems, stepping in to safeguard equipment from damage. Key Differences Between NTC and PTC Thermistors 1. Resistance Behavior: NTC Thermistors: Resistance decreases as temperature increases—ideal for accurate temperature measurements. PTC Thermistors: Resistance increases with temperature, serving as protectors against overheating. 2. Applications: NTC Thermistors: Found in devices needing precise temperature readings, like digital thermometers and temperature controllers. PTC Thermistors: Essential for applications such as motor protection circuits and resettable fuses. 3. Temperature Range: NTC Thermistors: Typically function over a broad range of temperatures. PTC Thermistors: Operate at specific temperatures, providing targeted protection. How to Identify NTC and PTC Thermistors Identifying whether you have an NTC or PTC thermistor can be simple and straightforward. Here are some effective techniques: 1. Visual Inspection Start by taking a close look at the thermistor. Many have part numbers printed on them, often indicating whether they are NTC or PTC. Checking the specifications listed on the component or packaging can also offer quick insights. 2. Testing Resistance with a Multimeter A multimeter is your best friend in this identification process. Here’s how to use it: Step 1: Ensure the device is powered off—safety first! Step 2: If necessary, disconnect the thermistor from the circuit. Step 3: Set the multimeter to measure resistance (ohms). Step 4: Measure the resistance at room temperature (around 20°C to 25°C). Step 5: Gently heat the thermistor using a heat source (like a heat gun) and measure the resistance again. Interpreting Results: If resistance drops as temperature rises, you have an NTC thermistor. If resistance inc...

Lithium battery formation: generally refers to the implementation of a series of technological measures to stabilize the performance of the initially charged battery, including small current charge and discharge, constant temperature static, etc. Lithium battery capacity division: that is to analyze the capacity. During the manufacturing process of the battery, the actual capacity of the battery cannot be completely consistent due to technological reasons. Through certain charge and discharge tests, the process of classifying the battery by capacity is called capacity division. The capacity division of the battery is completed by the chemical composition container (because the basic principles of chemical composition and capacity division are the same, the functions of chemical composition and capacity division are integrated in the same cabinet, which is called chemical composition container), and the function of dividing into a container is actually It is like a charger, but it can charge and discharge a large number of batteries at the same time. When the battery is divided into capacity, the data of each detection point is obtained through computer management, so as to analyze the data such as the capacity and internal resistance of these batteries, and determine the quality level of the battery. This process is capacity division. After the battery is divided for the first time, it needs to stand for a period of time, generally not less than 15 days. During this period, some inherent quality problems will appear. In order to improve the electrochemical performance of the battery such as cycle life, stability, self-discharge, safety, etc., the consistency of the lithium battery must be strictly controlled or the battery grade must be accurately assessed. Very demanding. As an important link in the production and manufacture of lithium batteries, chemical composition plays a crucial role in the consistency and stability of the final product. However, for a long time, in the manufacturing process of lithium batteries, the high energy consumption of testing equipment, the large heat generation, the high temperature of the production environment, and the unstable accuracy have become the biggest pain points in this process. For chemical formation, the higher the control accuracy of current and voltage, the better the quality of lithium battery products. The accuracy of current and voltage sensors is more than 1/10,000 is an ideal choice. For capacity distribution, test accuracy and capacity distribution ambient temperature are the two most important indicators to test its performance, and they are also the two most important advantages of energy feedback equipment.

Sensors are increasingly applied to various fields of social development and human life, such as industrial automation, robotics, medical diagnosis, household appliances, etc. In recent years, the global sensor industry has developed rapidly. Sensors not only enter people's daily work and family life, but also have been widely used in various sectors of the national economy. From the initial manufacturing of machinery and equipment, agricultural production, to electrical appliances, scientific instruments and meters, medical and health, communication electronics and automobiles, until the current smart home. Sensors are everywhere. In recent years, people's requirements for the quality of life have become higher and higher, which has led to an increasing demand for smart homes. The key parts of the smart home are mainly made of sensors, which naturally increases the sales of sensors. Sensors have become the touchstone in the wearable device industry chain, and a field with strong opportunities in the hardware industry chain. Taking Google Glass as an example, it has built-in more than 10 kinds of sensors, including the application of gyroscope sensor, acceleration sensor, magnetic sensor, linear acceleration and other sensors, which allows Google Glass to realize some functions that cannot be realized by traditional terminals, such as Users can take pictures with just a blink of an eye. All these intelligent operations are high-tech applications of source sensors. In the future, more sensor products may be fully applied in people's lives, and sensor technology will be further developed intelligently. In the future, sensors will perfectly fit with intelligent technology, and step by step towards a perfect intelligent life, it will not only subvert our vision, but also facilitate all aspects of our life and daily work.

We know that the safety threat of electric vehicles is not only the risk that may be caused by the defects of intelligent algorithm and functional design. One of the most important reasons for people to fear the accident of electric vehicles is the threat and injury caused by the explosion of the battery. too serious. For example, when the vehicle is in a static state, problems such as battery overcharge, short circuit, and liquid leakage caused by imperfect battery system management, incompatible communication, and communication barriers with charging equipment cannot be monitored and alarmed in advance, resulting in thermal runaway, spontaneous combustion, and fire. Such situations require the management of battery safety through a battery management system (BMS). The battery management system uses the CAN communication protocol and real-time dual ECU multi-level monitoring, which makes the communication between the charging equipment and the battery management system smooth and coordinated to ensure the safety of the battery. During the charging process, if the three links of battery cell, BMS, and sensor do not cooperate well, spontaneous combustion may occur. For the dynamic temperature change of battery charging and discharging, first of all, the pack design of the battery itself is very important, and it is necessary to ensure the heat dissipation and reliability of the battery, and secondly, the constant temperature thermal management technology of the battery pack of the electric vehicle can control the temperature of the battery cell more stably at a high efficiency, safe temperature range.

In today's society, temperature sensors can be said to be ubiquitous. Air conditioning systems, refrigerators, rice cookers, electric fans and other home appliances, as well as handheld high-speed and high-efficiency computers and electronic equipment, all need to provide temperature sensing functions. Taking a computer as an example, the faster the CPU runs, the more heat it dissipates. In order to prevent the computer system from being damaged by overheating, the system must strengthen the overheating protection function. On the other hand, if the system performs high-speed wireless transmission, it is necessary to provide temperature compensation due to frequency shift. The traditional temperature sensor method is limited by its package size, linear performance or accuracy, but the current temperature sensor chip not only has low power consumption and high accuracy, but also has better linear performance than traditional temperature sensors. The most important point It is easy to use. The chip development of temperature sensor has four directions: analog, digital, remote diode, and system monitor. The analog output temperature sensor is suitable for use in cellular mobile phones. Since these types of phones are very sensitive to temperature, over or under temperature protection is very important.

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The temperature transmitter technology has been very mature, and it is very common in various factories. The temperature transmitter is often used in conjunction with some instruments, and there are often some small faults during the supporting use. The more common faults and solutions are as follows. First, the output of the transmitter does not change when the temperature of the measured medium increases or decreases. Most of these cases are caused by the sealing of the temperature transmitter. It may be because the temperature transmitter is not sealed well or is careless during welding. The sensor is welded with a small hole, which generally requires replacing the transmitter housing to solve. Second, the output signal is unstable. This reason is the reason of the temperature source, which is an unstable temperature. If the instrument display is unstable, it is the reason that the anti-interference ability of the instrument is not strong. Third, the output error of the transmitter is large, and there are many reasons for this situation. It may be that the resistance wire of the selected temperature transmitter is not correct, resulting in a wrong range, or it may be that the transmitter is not calibrated well when it leaves the factory.