The sensor is an external part that come with the Videojet CIJ printer. We always deliver it along with the printer itself. However, it may be confusing how to connect the sensor to the printer, here is the how-to.
Connect the blue wire to #1, black one to #2 and brown one to #3. There you go, the sensor is ready.
Any questions about Videojet inkjet printers, please feel free to contact us.