402FG4K

Temperature Sensors - NTC Thermistors

Temperature sensors, or thermistors, play an important role in applications that measure and/or manipulate temperatures. The most commonly used types are NTC (Negative Temperature Coefficient) thermistors, which exhibit a decrease in electrical resistivity with increasing temperature. One example of an NTC thermistor is the 402FG4K model, which is often used in automotive and industrial temperature control applications.

Applications of 402FG4K

The 402FG4K thermistor is highly accurate and reliable, making it the preferred choice for applications where precise temperature control is necessary. Some of the most common applications for the 402FG4K include:

• Automotive engine monitoring
• Industrial process control
• Temperature regulation in laboratory and medical equipment
• Environmental monitoring
• HVAC control systems
• Electrical power control
• Security systems
• Home automation systems.

Working Principle of 402FG4K

The 402FG4K thermistor operates on the principle of thermoelectric effect, also known as Seebeck effect. When two dissimilar metals, or semiconductors, are brought into contact with each other, a temperature gradient is created, and a measurable voltage is generated between the two materials. The voltage generated is proportional to the temperature gradient, which in the case of the 402FG4K is the rate of change of resistance with changing temperature.

The 402FG4K is constructed from a metal oxide ceramic core, which is encapsulated in a protective sleeve made of stainless steel. The core contains a highly conductive material, such as zinc or copper, and is placed within a resistor. As the temperature of the core increases, it expands and pushes the resistor, which in turn increases the electrical resistance of the thermistor. This increase in resistance is measured using an Ohm meter, and is directly proportional to the temperature.

In addition to measuring temperature, NTC thermistors can also be used to control temperature. In this case, the thermistor is connected to a control circuit, and when the temperature reaches a certain level, the control circuit will activate an appropriate device, such as a fan or a heating element.

Advantages of 402FG4K

NTC thermistors, like the 402FG4K, are highly sensitive to temperature, and provide accurate and reliable measurements. Additionally, they are relatively inexpensive, small in size, and are available in a variety of shapes and sizes, making them ideal for applications where space is limited. They also have a wide operating temperature range, from -80°C to +250°C, and are capable of withstanding high temperatures and rough handling without damage.

The 402FG4K thermistor is also easy to install and maintain, and can be used in a variety of applications, from automotive engine monitoring to security systems. Finally, it is highly accurate and stable over long periods of time, making it the perfect choice for temperature monitoring and control.