Solenoid Diaphragm
| Identification | |
| Manufacturer | Grundfos |
| Series | DDA SMART Digital |
| Model / size | DDA 120-1 |
| Dosing type | Solenoid Diaphragm |
| Pump class | Category A — Solenoid diaphragm, low-flow precision dosing. Stroke frequency 300 SPM. Accuracy ±1.0%. Best for: intermittent duty, water treatment, swimming pools. Limit: 120.0 L/h, 1.0 bar. |
| Spec code | DSG-016 |
| Dosing duty | |
| Min flow | 5 L/h |
| Max flow | 120 L/h |
| Max pressure | 1 bar |
| Dosing accuracy | 1 % |
| Stroke frequency | 300 spm |
| Suction lift | 3 m |
| Max viscosity | 500 cP |
| Control & drive | |
| Control type | Digital 4-20mA + Pulse + Profibus |
| Stroke adjustment | Digital 0-100% |
| Power | 256 W |
| Supply voltage | 100-240 VAC (auto) / 24 VDC V |
| IP rating | IP65 (NEMA 4X) |
| Materials & chemical | |
| Liquid end | PVDF |
| Diaphragm | PTFE/EPDM |
| Valve / ball | Ceramic |
| pH range | 0-14 (full range — HF, concentrated acids, caustic) |
| Chemical compatibility | Chlorine, pH adj., Coagulant, Polymer, Antiscalant |
| Application | |
| Service | Water Treatment Dosing, Wastewater |
| Key features | Grundfos DDA 120 L/h at 1 bar, maximum flow SMART Digital, 300 SPM, FLOWControl, 1% accuracy |
A complete, shareable page for a single pump. It plots the performance curve (head, efficiency and NPSHr against flow, with the best-efficiency point marked, or dosing flow against stroke), decodes the API 682 / ISO 21049 mechanical seal plan, and lists the full specification — duty and operating range, drive and motor, materials of construction, build and reliability, connections, weight and certifications. Pop-up panels give the type-specific preventive-maintenance schedule (daily to annual tasks with procedures) and a troubleshooting guide (symptoms, probable causes and recommended solutions).
Run a centrifugal pump near its BEP and keep dosing pumps in their recommended stroke band. Data is from the engineering reference database — confirm against the manufacturer's certified curve before procurement.
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