PTC sensors, or Positive Temperature Coefficient sensors, are vital components used to monitor and control temperature in a wide variety of applications. At Focusens, we specialize in providing high-quality PTC sensors designed for accuracy and reliability. This article explores the working principle, types, and applications of PTC sensors, helping you understand their important role in modern technology. What is a PTC Sensor? A PTC sensor is a type of temperature sensor whose resistance increases as the temperature rises. The term “positive temperature coefficient” refers to this characteristic. As the temperature increases, the resistance of the material inside the PTC sensor increases proportionally. This property is what makes PTC sensors ideal for use in temperature sensing, overcurrent protection, and self-regulating heating applications. How Do PTC Sensors Work? The working principle of a PTC sensor is straightforward. PTC materials, typically made from ceramics or polymers, exhibit a resistance that increases sharply with temperature. In a typical setup, when the temperature exceeds a certain threshold, the sensor’s resistance increases dramatically, reducing the current flowing through the circuit. This makes PTC sensors useful for temperature protection and overload protection in electrical circuits. For example, in an overcurrent protection circuit, when the current rises too high, the PTC sensor heats up, causing its resistance to increase and limiting the current flow. This helps prevent damage to other components, such as motors or circuits, by reducing the excessive current. Types of PTC Sensors PTC sensors come in several types, each suited for different applications. Below are the most common types: Resettable PTC Sensors These sensors are self-regulating, meaning they automatically reset after the temperature returns to a safe range. Once the temperature exceeds the threshold, the resistance increases, reducing the current. When the temperature drops, the resistance decreases, allowing normal current flow to resume. These sensors are widely used in overload protection and thermal switches. Fixed PTC Sensors Fixed PTC sensors have a permanent increase in resistance after reaching a certain temperature. They are used in applications where once the temperature limit is reached, the sensor needs to stay in a high-resistance state, like in over-temperature protection systems. High-Temperature PTC Sensors These sensors are designed to operate at very high temperatures and are commonly used in industrial applications. Their high-temperature resistance characteristics are ideal for monitoring extreme temperature conditions, such as those found in furnaces or industrial machinery. Low-Temperature PTC Sensors Low-temperature PTC sensors are used in sensitive applications that require precise temperature control at lower temperatures. They are often used in devices that need to maintain a consistent, low temperature without exceeding criti...

Temperature sensors are vital components in many industries, from manufacturing and healthcare to electronics and automotive systems. They measure temperature by converting it into a readable electrical signal, helping systems to monitor and control temperature accurately. At Focusens, we specialize in providing high-quality temperature sensor types designed to meet the needs of a wide variety of applications. Let’s take a look at the most common temperature sensor types and their uses. 1. Thermocouples Thermocouples are one of the most widely used temperature sensor types. They consist of two different metal wires joined at one end. When the junction of these metals is heated or cooled, it generates a voltage that corresponds to the temperature. The voltage can then be measured and translated into temperature readings. Advantages of Thermocouples: Wide Temperature Range: Thermocouples can measure very high temperatures (up to 1800°C) and low temperatures (as low as -200°C). Fast Response Time: Thermocouples are known for their quick response to temperature changes, making them ideal for dynamic environments. Durability: These sensors are highly durable and can withstand harsh conditions. Applications: Industrial equipment Furnace and oven monitoring Temperature measurement in automotive systems 2. RTD Sensors (Resistance Temperature Detectors) RTD sensors are temperature sensors that measure temperature by correlating the resistance of the RTD element with temperature. Most RTDs are made from pure platinum, as its resistance increases in a nearly linear fashion with temperature, making it ideal for precise measurements. Advantages of RTD Sensors: High Accuracy: RTD sensors are highly accurate, offering precise temperature measurements. Stability: They offer long-term stability and are less affected by changes in environmental conditions. Wide Temperature Range: RTDs are ideal for applications requiring a wide operating temperature range, typically from -200°C to 850°C. Applications: Laboratory equipment HVAC systems Food processing Automotive systems 3. Thermistors Thermistors are temperature sensors that work based on the principle that the resistance of a material changes with temperature. Thermistors typically have a higher degree of sensitivity than RTDs or thermocouples, making them ideal for more precise measurements in specific temperature ranges. There are two main types of thermistors: NTC (Negative Temperature Coefficient): Resistance decreases as temperature increases. PTC (Positive Temperature Coefficient): Resistance increases as temperature increases. Advantages of Thermistors: High Sensitivity: Thermistors provide more precise temperature readings in narrow temperature ranges. Cost-Effective: They are more affordable than other temperature sensor types. Small Size: Their small size makes them ideal for applications where space is limited. Applications: Household appliances (e.g., refrigerators, washing machines) Medical devices (e...

In the world of temperature measurement, high-accuracy thermistors are becoming increasingly vital. These small yet powerful components play a crucial role in ensuring precise temperature control across various industries. At Focusens, we specialize in providing high-accuracy thermistors that offer outstanding performance, reliability, and accuracy for a wide range of applications. What is a Thermistor? A thermistor is a type of resistor whose resistance varies significantly with temperature. The term "thermistor" is derived from the combination of "thermal" and "resistor," reflecting their core function of changing resistance with changes in temperature. Thermistors are commonly used in temperature sensing applications because they offer high sensitivity, quick response times, and a wide range of resistance values. There are two primary types of thermistors: NTC (Negative Temperature Coefficient) and PTC (Positive Temperature Coefficient). The key difference between them is how their resistance changes with temperature. NTC thermistors decrease in resistance as temperature increases, while PTC thermistors increase in resistance with rising temperatures. Why Choose High-Accuracy Thermistors? High-accuracy thermistors are designed to provide precise and reliable temperature readings. The accuracy of a thermistor is essential in many applications, from industrial automation and HVAC systems to medical devices and consumer electronics. Here’s why high-accuracy thermistors are important: Precise Temperature Control: Many systems, especially those in critical industries such as healthcare and aerospace, require precise temperature control. A high-accuracy thermistor ensures that these systems operate efficiently, preventing overheating or undercooling that could lead to equipment failure or safety hazards. Quick Response Time: High-accuracy thermistors typically have fast response times, meaning they can quickly adapt to changes in temperature. This feature is essential for applications where temperature fluctuations need to be detected and managed in real-time. Wide Temperature Range: Many high-accuracy thermistors can function over a broad temperature range, making them versatile and suitable for a variety of environmental conditions. Whether it's for extreme cold or heat, a high-accuracy thermistor can provide reliable temperature readings. Long-Term Stability: For industries that rely on consistent performance over time, high-accuracy thermistors are a dependable choice. They maintain accuracy for extended periods, ensuring reliable data for long-term operations. Applications of High-Accuracy Thermistors High-accuracy thermistors are used in a wide array of industries and applications. Here are some common use cases where Focusens' high-accuracy thermistors play an essential role: Medical Devices: In medical equipment like patient monitoring systems or thermometers, precise temperature measurement is critical. High-accuracy thermistors are used to...

"Welcome to the Focusens website. If you reply to the news, please wear it online and prepare for help." Incoming Material Inspection To ensure that all raw materials meet product specifications and quality standards, our company inspects the batch number, production date, and quality certification documents of the materials. We conduct a visual inspection to ensure that there is no damage, contamination, or deformation. It's important to note that we have standardized control procedures for supplier onboarding and material procurement, along with regular evaluations to enhance the quality assurance of both materials and supplier capabilities. Cable Preparation (Cutting and Stripping Sensor Harness) According to product design requirements, we cut the cables to the appropriate length. Using specialized cutting and stripping equipment and insulation strippers, we cut the cables based on design drawings. Additionally, to enhance signal conductivity and stability, and to improve downstream process performance, we perform tinning on the conductor of the stripped wires when the process requires it. Connecting Components and Lead Wires (Spot Welding/Soldering/Copper Band Crimping) Depending on the product's application and performance needs, we choose the appropriate connection method to securely connect the sensor's sensing elements with the wires. For example, when dealing with thermistors, which are temperature-sensitive resistors, it’s essential to ensure proper connections to maintain accurate temperature readings. Understanding what a thermistor does—primarily acting as a temperature sensor by changing resistance with temperature—helps guide these processes. We use spot welding equipment to connect the components. During soldering, we keep the soldering iron tip clean and control the welding time and temperature to ensure a secure connection without damaging the components. Weld Inspection We inspect the weld points for completeness and uniformity using CCD, magnifying glasses, or visual inspection to ensure there are no cold solder joints, short circuits, or burrs. To ensure weld quality meets standards, weld inspection is treated as an independent process, with 100% of products inspected. It is crucial to verify that connections, especially in thermistors, maintain their integrity to avoid false readings. If you’re wondering how to test a thermistor, it's important to measure its resistance at different temperatures to ensure it performs correctly. Parts Taping and Alignment To facilitate batch packaging operations, we align and tape the semi-finished sensors, ensuring that the final product's appearance and dimensions are consistent. This step is particularly important for thermistors, where precise alignment impacts their accuracy. Encapsulation and Curing Typically, our sensors undergo 2-3 encapsulation processes to ensure sufficient voltage resistance and insulation reliability for each sensor. This is vital for thermistors, as the encapsul...