Both the P28 and P131 instructions will work with the AVW100. The AVW100 was designed for sensors with measurement frequencies below 1000 Hz, so it is the best choice if any part of the swept frequency of the transducer is below 1000 Hz. Compared to the P28 instruction, the P131 instruction has four additional user-configured parameters, which allow the user to fine tune the measurement; otherwise, the P28 and P131 instructions are identical.