Yes. The Pax 3 was specifically designed with both flower and concentrate use in mind. To effectively vaporize concentrate, it is best to purchase the Pax 3 concentrate insert. Place your desired concentrate into the insert, and then attach the insert to your device. From here, the standard vaping procedures apply. Keep in mind that the Pax 2 device is compatible with the Pax 3 concentrate insert as well.
Also, note that the concentrate insert is included in the Pax 3 Vaporizer Complete Kit, but it is not included in the Standard Kit.