HONEYWELL FF-SB12E04K-S2是霍尼韦尔（Honeywell）公司生产的一种热敏电阻温度传感器。这种传感器通常用于测量和控制各种设备和系统的温度。

是一种热敏电阻，具有正温度系数（PTC）。这意味着它的电阻值会随着温度的升高而升高。这种特性使得 PTC 热敏电阻非常适合用于温度控制和过温保护等应用。

PTC 热敏电阻的工作原理是基于半导体的热敏特性。当温度升高时，半导体的载流子数量增加，电阻值相应增加。因此，通过测量 PTC 热敏电阻的电阻值，可以确定当前的温度。

* 温度控制：PTC 热敏电阻可用于控制加热设备，如电热器、烤箱等，以保持温度恒定。

* 过温保护：PTC 热敏电阻可用于监测设备的温度，并在温度超过安全范围时切断电源或触发警报，以保护设备免受损坏。

* 温度检测：虽然不如 NTC 热敏电阻常见，但 PTC 热敏电阻也可用于一些温度检测应用，如发热故障监测等。

It is a thermistor temperature sensor produced by Honeywell Company. This type of sensor is typically used to measure and control the temperature of various devices and systems.

It is a thermistor with a positive temperature coefficient (PTC). This means that its resistance value will increase with the increase of temperature. This characteristic makes PTC thermistors very suitable for applications such as temperature control and over temperature protection.

The working principle of PTC thermistors is based on the thermal characteristics of semiconductors. As the temperature increases, the number of charge carriers in the semiconductor increases, and the resistance value correspondingly increases. Therefore, by measuring the resistance value of the PTC thermistor, the current temperature can be determined.

*Temperature control: PTC thermistors can be used to control heating equipment, such as electric heaters, ovens, etc., to maintain a constant temperature.

*Over temperature protection: PTC thermistors can be used to monitor the temperature of equipment and cut off the power supply or trigger an alarm when the temperature exceeds the safe range to protect the equipment from damage.

*Temperature detection: Although not as common as NTC thermistors, PTC thermistors can also be used for some temperature detection applications, such as heating fault monitoring.