22101

221 01 (220/221 ohms) is a low-cost temperature sensor, which is usually used in automatic control systems. It is used to detect temperature changes in a control area or to measure temperatures in a range of applications. In this article, we will discuss its application field and working principle.

Application Field

221 01 is a device that can measure temperature in systems such as refrigerators, air conditioners and other electrical systems. It can be used for automatic temperature monitoring, temperature control, and other temperature-related applications. It is also widely used to control the temperature and humidity of greenhouses and laboratories.

Working Principle

The principle of 221 01 temperature sensor is based on the basic concept of resistance temperature detection. The generator outputs a constant voltage and the temperature sensor element generates a resistance that is affected by the temperature. The temperature sensor component is an NTC (negative temperature coefficient) thermistor made of ceramic materials. When the temperature changes, the resistance of the thermistor also changes. The resistance is lower when the temperature rises and higher when the temperature falls.

The internal resistor in the 221 01 has a resistance value of 220 Ω or 221 Ω, respectively. The resistance of the thermistor can be calculated by dividing its resistance value by the resistance of the internal resistor. The ADC (analog-to-digital converter) can convert the analog resistance signal into a digital number, which can be read directly by the microcontroller in the system. In this way, the temperature can be calculated accurately.

Conclusion

The 221 01 temperature sensor is a low-cost and widely used temperature sensor. It is used in a variety of temperature-related applications and can accurately detect temperature changes. The application field and working principle of 221 01 have been discussed in this article, which may be helpful in understanding and using this temperature sensor.