HL-KZ-1401series humidity control unit with CH402 series PID controller is used to control humidity HL-KZ- ... 1401series humidity control unit with CH402 series PID controller is used to control humidity systemsPower supply ... , 4~20mAThe control box includes HS-P6100 humidity sensor and CH402 PID controllerBy setting a changeover switch, winter/ summer changeover and ...