An impurity pellet injector is being developed for the RFX reversed field pinch (RFP) with three aims: measurement of the pitch of the magnetic field lines, transport studies, and first wall conditioning. The injector uses pneumatic ally accelerated metal sabots to launch the pellets. In this way the same barrel can be used for pellets of different sizes, speeds and materials. With drive pressures of 1-10 bars, velocities of 50-400 m/s can be obtained, which, based on code simulations, are adequate for core ablation. The measurement of the internal magnetic field will be done by diagnosing the direction of elongation of the pellet plasmoid using a masked charge coupled device camera capable of acquiring 28 images 40 lines x 1024 pixels each with a maximum sampling rate of 50 kHz.
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