Introduction If sensors are used in your equipment or control systems, having these signal converter modules like this NPN to PNP converter readily available could effectively eliminate the last-minute problems that you encounter when your controller and the type of sensor you are ...Introduction If sensors are used in your equipment or control systems, having these signal converter modules like this NPN to PNP converter readily available could effectively eliminate the last-minute problems that you encounter when your controller and the type of sensor you are using have a mismatched signal. This signal converter is designed to convert NPN signal to PNP and is equipped with surge absorption and over-current protection to further protect your device.