Peristaltic/Hose
| Identification | |
| Manufacturer | Watson-Marlow |
| Series | 500 Series |
| Model / size | 520UN/R |
| Dosing type | Peristaltic/Hose |
| Pump class | Category E — Peristaltic/hose, gentle handling dosing. Tube compression mechanism. Accuracy ±2.0%. Best for: shear-sensitive fluids, food/pharma, slurries, abrasives. Limit: 35.0 L/h, 2.0 bar. Self-priming. |
| Spec code | DSG-146 |
| Dosing duty | |
| Min flow | 5 L/h |
| Max flow | 35 L/h |
| Max pressure | 2 bar |
| Dosing accuracy | 2 % |
| Stroke frequency | 60 spm |
| Suction lift | 8 m |
| Max viscosity | 5000 cP |
| Control & drive | |
| Control type | Digital + Analog 4-20mA + Manual |
| Stroke adjustment | Variable speed 0-100% |
| Power | 114 W |
| Supply voltage | 230 VAC 1-phase V |
| IP rating | IP55 |
| Materials & chemical | |
| Liquid end | Peristaltic tube |
| Diaphragm | N/A (Tube pump) |
| pH range | 2-12 (general purpose) |
| Chemical compatibility | Shear-sensitive fluids, suspensions, viscous chemicals, polymers |
| Application | |
| Service | Water Treatment, Wastewater, Chemical Process |
| Key features | Watson-Marlow 520UN/R, 35 L/h at 2 bar, industrial peristaltic, 5000 cPs, 8m suction, continuous dosing |
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.
Our expertise spans multiple industries with sector-specific water treatment solutions.
Explore closely-related tools, references and guides
Send your influent analysis and our engineers assess your process and recommend a tailored treatment solution — free, confidential and no obligation.
Select the regulatory standard for your country — it sets which parameters we need for a compliance-aware process assessment.
Required parameters for the chosen standard are flagged on the sample form. You can still submit a partial set and we will advise what else to test.
Your sample is stored against your company so we can track the project. Provide a company name or email as a minimum.