One of the sensors used in Siemens locomotives to regulate diesel engine power is a thermal sensor based on variable resistance with temperature, which reacts to the exhaust temperature. In order to localize this need, Peyvand Fanavaye Giti Co., Ltd. has made the corresponding sensor in the temperature range of 500 to 800 degrees Celsius. As the diesel exhaust temperature rises above the permissible limit, the output of this sensor causes the control circuit to reduce the power by 20%, and as a result, the temperature drops again.