Grundfos DDE (S)-PR Speed Controlled Diaphragm Dosing Pump

The Grundfos DDE (S)-PR Digital Diaphragm Dosing Pump is a precision dosing solution designed for applications where chemical injection must be synchronised to an external pulse signal, such as flow meters, PLCs, or irrigation controllers. This listing covers both PR pulse-operated variants, allowing customers to select the correct flow and pressure combination for their application.

Unlike manual-only dosing pumps, the DDE-PR series accepts pulse input control, automatically adjusting the dosing volume in proportion to incoming pulses. This makes it ideal for flow-proportional dosing, where chemical injection must track system demand accurately and consistently.

Built on Grundfos SMART Digital Dosing technology, the DDE-PR uses an internal stepper motor drive to maintain full stroke length across the entire operating range. This ensures high dosing accuracy, smooth discharge flow, and reliable priming—even when handling degassing liquids. The pump can be switched easily between manual and pulse operation, offering flexibility during commissioning, testing, or maintenance.

Both variants feature a chemically resistant PVC dosing head, ceramic double ball valves, and PTFE gaskets, making them suitable for common water treatment and conditioning chemicals. Integrated level control, external stop input, and configurable output relays provide additional system protection and monitoring capability.

With an IP65 / Type 4X enclosure, low power consumption, and a compact footprint, the Grundfos DDE (S)-PR is well suited for irrigation fertigation systems, water treatment plants, OEM dosing skids, and industrial process water applications where accurate, pulse-based dosing is required.

APPLICATIONS

• Flow-proportional chemical dosing using water meters
• Irrigation fertigation systems with pulse-output flow meters
• Disinfection dosing linked to variable system demand
• Water treatment systems requiring pulse-synchronised dosing
• Industrial process water dosing controlled by PLC or BMS
• OEM dosing skids requiring pulse input and alarm feedback
• Chemical injection where dosing must track real-time flow rates

FEATURES

• Digital diaphragm dosing pump with pulse input control
• Flow-proportional dosing via external pulse signal
• Divisor function for precise dosing per pulse
• Manual and pulse operation selectable via front panel
• Internal stepper motor drive with full stroke length control
• Integrated level control input for empty tank protection
• External stop input for system interlock
• Two configurable potential-free output relays (alarm, pulse, full stroke, level)
• PVC dosing head with PTFE gaskets for chemical resistance
• Ceramic double ball valves for dosing accuracy
• Full-PTFE diaphragm for long service life
• IP65 / Type 4X enclosure for harsh environments

SPECIFICATIONS

• Turn-down ratio: 1:1000
• Accuracy of repeatability: ±5%
• Maximum viscosity: 50 mPas

Hydraulic

• Maximum suction lift (operation): 6 m
• Maximum suction lift (priming):
• 6-10 PR: 2 m
• 15-4 PR: 3 m
• Liquid temperature range: 0 to 45 °C
• Ambient temperature range: 0 to 45 °C

Materials

• Dosing head: PVC (Polyvinyl Chloride)
• Valve balls: Ceramic (Al₂O₃)
• Gaskets: PTFE
• Diaphragm: Full-PTFE

Connections

• Inlet / Outlet hose sizes: 4/6, 6/9, 6/12, 9/12 mm

Electrical & Controls

• Rated voltage: 1 × 100–240 V, 50/60 Hz
• Power input: 19 W
• Enclosure class: IP65 / Type 4X
• Cable length: 1.5 m
• Plug type: Australian
• Pulse control: Yes
• Level control: Yes
• External stop input: Yes
• Output relays: Yes (potential-free)