The Pion Rainbow Dynamic Dissolution Monitor (RDDM®) is a powerful analytical instrument that accurately and efficiently measures percent dissolved data in real time.

Product Description

Pion’s fiber optic-based RDDM, celebrating its 20th year anniversary, is used throughout the industry and serves as the benchmark for in situ dissolution monitoring.  Whether USP dissolution or more novel apparatus are your area of research, in situ analysis can:

improve throughput

reduce consumables

eliminate waste streams

provide more detailed profiles


Built with a world-class optical bench, the RDDM allows for the simultaneous analysis of up to 8 vessels as fast as every 2 seconds. No more offline LC analysis. No more dealing with pump maintenance and troubleshooting. The fastest path to accurate dissolution analysis is the focus of the technology.


Pump the light.  Not the liquid.






Up to 8 channels with dedicated PDA for each channel

200-720 nm effective range

Scanning frequency as fast as every 2 seconds

Linear range up to 1.6+ A.U.

Durable stainless steel dip probes with variable path lengths of 1, 2, 5, 10 or 20 mm.

Horizontal analysis path available through the J style dip probe




For more information about Rainbow®