Watson Marlow 620 Du/R Peristaltic pump

Watson Marlow 620 Du/R

This listing is for the Watson Marlow 620 Du/R Peristaltic pump

The unit is in full working condition and is ready for immediate use

The 620DU is a process peristaltic pump (i.e. hose pump) designed for metering, dosing, and transfer of fluids.

Because it is a peristaltic design, the fluid is contained entirely within the tubing, avoiding contact with internal moving parts (other than the tubing).
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It is suitable for remote control, automation, and integration into control systems (SCADA, factory logic, etc.).

Wide control range & precision: The large turndown (2,650:1) gives flexibility to handle both very low and high flow rates with fine control.

Remote / automation capabilities: Because it supports analog and digital interfaces, it’s well-suited for integrated systems.

Pump protection & security: PIN locking helps avoid unintentional changes in process-critical applications.

Low maintenance on non‑wetted parts: Since only the tubing contacts fluid, mechanical wear is mostly on the tubing, making part replacement simpler.

Safe to run dry: Peristaltic pumps typically tolerate running dry without damage (unlike many positive displacement pumps).

Reversible / ability to back‑flush: This is helpful when attempting to clear lines or avoid clogging.

Limitations / Considerations

Tubing wear / life: The hose or tubing is the consumable component. Chemical compatibility, pressure, and mechanical stress affect how often tubing needs replacement.

Upper pressure / flow limit: While it handles decent pressure (~2 bar standard, possibly up to 4 bar variant), it’s not suited for very high-pressure pumping tasks.

Enclosure limitations (non-“N” model): The standard 620DU is not fully sealed, so it may not be ideal for wet or harsh environments unless you use the “N” variant.

Cost / complexity: More features, interfaces, and protection can make the system more complex (and costlier) to configure, install, and maintain.