If the system measured temperature exceeds the set temperature range of values, alarm systems start working.alarm system consists of a shock buzzer, self-excited (NPN transistor) and electroluminous.

• 如果系统测得温度超过设定的温度值范围，报警系统开始工作。报警系统由一个自激震荡蜂鸣器、三极管(NPN)和发光二极管组成。