Which settings on a D6 IL 3000 water-powered proportional dosing pump help maintain dosing ratio stability at 0.25 bar and 250 L/h with a low-viscosity additive?
1 answer
On the DOSATRON D6 IL 3000, dosing ratio stability at 0.25 bar and 250 L/h is primarily influenced by how close the installation operates to the pump hydraulic lower limits and by the repeatability of the dosing adjustment position. At these conditions, the system is operating very near the minimum inlet pressure range (typically specified around 0.23 to 8 bar), so even small upstream pressure variations can affect the motor speed and the apparent dosing ratio.
To help maintain a stable ratio with a low-viscosity additive, set the dosing adjustment as high as the process allows within the model range, because extremely low settings are inherently more sensitive to minor suction-side effects and hydraulic micro-variations. In practice, targeting 0.2 to 0.3% rather than the very bottom end generally improves stability. Keep the adjuster locked exactly on-scale (avoid intermediate positions), ensure the suction line is perfectly airtight and as short as possible, keep the foot strainer fully submerged, and stabilize upstream pressure by avoiding undersized filters or regulators that can introduce pressure ripple.
If the application requires very low ratios under these low-pressure hydraulics, selecting a model designed for stable low-ratio dosing on centralized systems (for example D9IL3000) can be a robust approach while staying within the DOSATRON proportional, non-electric dosing principle.