The Grundfos DDA 30-4 AR-PP is a compact, positive displacement, digital diaphragm dosing pump featuring variable-speed stepper motor technology. Part of the Grundfos SMART Digital Dosing series, this pump delivers exceptional chemical injection accuracy with a turndown ratio of 1:1000. Manufactured in France, this model is engineered for precision applications requiring flow rates up to 30 l/h at pressures up to 4 bar.
Key Technical Specifications
- Model Number: DDA 30-4 AR-PP (Verify full suffix for exact configuration)
- Product Numbers Available: 93016969, 97722245, 97974141
- Max. Flow Rate: 30 l/h (7.93 GPH)
- Min. Flow Rate: 0.03 l/h (30 ml/h)
- Max. Operating Pressure: 4 bar (58 psi)
- Turn-down Ratio: 1:1000
- Repeatability Accuracy: ±1%
Materials of Construction
- Dosing Head: Polypropylene (PP) – Excellent chemical resistance for alkaline solutions and salts
- Valve Balls: Ceramic – High durability and sealing precision
- Gaskets/Seals: EPDM – Suitable for water treatment and specific chemicals
- Diaphragm: Full PTFE (Teflon) – Long lifetime and universal chemical resistance
Electrical & Control
- Power Supply: 1 x 100-240V, 50/60 Hz (Universal Voltage)
- Power Input (P1): 24 W
- Enclosure Rating: IP65 / NEMA 4X (Dust-tight and water-jet protected)
- Control Interface: AR Variant with color graphic LC display and Click Wheel navigation
- Communication: Modbus RTU/TCP ready (Fieldbus control with E-box)
Advanced Features & Operation Modes
The SMART Digital DDA operates at full stroke length, varying the speed of the stroke to adjust capacity rather than stroke length. This ensures smooth, continuous flow and excellent priming, even with viscous or degassing liquids.
Operation Modes:
- Manual: Direct setting in ml/h, l/h, or GPH
- Pulse Control: ml/pulse with memory function
- Analog Control: 0/4-20 mA (scalable)
- Batch Dosing: Pulse-based or timer-based (cycle/weekly)
- SlowMode: 50% (15 l/h) and 25% (7.5 l/h) for high-viscosity liquids (up to 1500 mPas)
Smart Functions:
- AutoDeaeration: Automatic venting during standby to prevent air-locking
- Service Info Display: Predictive maintenance with wear-part order numbers
- Multi-parameter Dashboard: Real-time monitoring of flow, pressure, and temperature
- Key Lock: Two-step keypad protection against unauthorized access
Applications
Ideal for precise chemical dosing in industrial processes and water treatment:
- Water Disinfection & Treatment (Chlorine, pH correction)
- Industrial Process Water
- Cooling Towers & Boilers
- Detergent & Polymer Dosing
- Wastewater Treatment
