Amazon.com: NPN PNP Signal Converter, MRI-24TR/INV PLC Sensor Polar IO Level Conversion Module, PNP to NPN Signal Converter Relay : Industrial & Scientific
Sensor Controller, PNP/NPN/Contact Input, Aux. 230VAC, Sensor Power 12VDC, Relay Output, Rail and Foot Mount, Made in India, AUTONIX PU-1Z : Amazon.in: Industrial & Scientific
Slim DIN Rail Mount NPN to PNP/PNP to NPN Sensor Logic Signal Converter Module: Amazon.com: Industrial & Scientific