The DICE DS is designed for Suction Lift applications (pump is above the fluid level)
The DICE DM is designed for Flooded Suction applications (pump is below the fluid level)
The difference in the design of the two modules is the addition of a ball valve in the middle of the DICE™ DM module, used for calibration, as detailed below.
Read more about the differences HERE
DICE DS - Suction Lift
DICE DM - Flooded Suction