What is the primary advantage of a peristaltic pump?

Peristaltic pumps offer gentle, low-shear pumping action, preventing contamination as the fluid only contacts the tubing. They are ideal for sensitive or abrasive fluids and provide accurate, repeatable dosing.

Can this pump handle corrosive chemicals?

Yes, as the fluid only contacts the inside of the tubing, the pump can handle corrosive chemicals provided the tubing material is chemically compatible with the fluid being pumped. Buyers should verify tubing material suitability for their specific application.

Is this unit suitable for continuous operation?

Peristaltic pumps like the 620S/R are designed for continuous operation, particularly with their robust brushless DC motor. Regular inspection and replacement of tubing are necessary for sustained performance.

What maintenance is typically required for this type of pump?

The primary maintenance involves routine inspection and replacement of the peristaltic tubing, which is a wear part. The brushless motor generally requires minimal maintenance. The wipe-down enclosure facilitates easy cleaning.

Can the flow rate be precisely controlled?

Yes, units of this type typically offer exceptional speed accuracy and a high turndown ratio, allowing for very fine control of flow rates and precise dosing.

Are spare parts and tubing readily available for Watson Marlow pumps?

Watson Marlow is a well-established manufacturer, and spare parts, particularly tubing and pump heads, are generally widely available through official distributors and suppliers.

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Watson Marlow 620S Peristaltic Pump

Used Watson Marlow 620S Peristaltic Pump - Peristaltic Pumps, photo 1

Used Watson Marlow 620S Peristaltic Pump - Peristaltic Pumps, photo 2

Used Watson Marlow 620S Peristaltic Pump - Peristaltic Pumps, photo 3

Used Watson Marlow 620S Peristaltic Pump - Peristaltic Pumps, photo 4

Used Watson Marlow 620S Peristaltic Pump - Peristaltic Pumps, photo 5

Used Watson Marlow 620S Peristaltic Pump - Peristaltic Pumps, photo 6

Used Watson Marlow 620S Peristaltic Pump - Peristaltic Pumps, photo 7

Used Watson Marlow 620S Peristaltic Pump - Peristaltic Pumps, photo 8

Used Watson Marlow 620S Peristaltic Pump - Peristaltic Pumps, photo 9

Used Watson Marlow 620S Peristaltic Pump - Peristaltic Pumps

used Equipment

Available

Verified seller

Watson Marlow 620S Peristaltic Pump

Name: Watson Marlow 620S Peristaltic Pump
Brand: Watson Marlow
SKU: 45289.SR4B SR8B
Availability: InStock

Price: Contact seller for price

This listing is for a Watson Marlow 620S/R Peristaltic Pumps.

The units are in full working condition and ready for immediate use.

Design & Functionality

The 620S/R model is part of the 600 Series of cased peristaltic pumps featuring a brushless DC motor equipped with digital keypad control (620S) and a sturdy NEMA 2 / IP31 vented, wipe‑down enclosure suited for dry industrial environments.

It operates at dual voltage (100–120 V or 200–240 V, 50/60 Hz) and includes features like MemoDose for one-shot dosing and wireless guard-switching for safety.

The casing is chemically resistant, with powder-coated die-cast aluminium construction and an easy-to-clean membrane keypad.

Pump Performance

Flow range: 0.00026 to ~4.23 gpm (equivalent to ~0.001 to 16 L/min) with the 620R pump head.

With newer 620RE LoadSure heads, the flow increases up to ~4.76 gpm (0.004–18 L/min).

Pressure capability: Up to approximately 60 psi (4 bar) with the appropriate head and tubing.

Control accuracy: Exceptional 2,650:1 turndown ratio, fine speed control from 0.1 to 265 rpm in selectable increments (0.1, 0.5, 1, 2, 5, or 10 rpm), with 0.1% speed accuracy.

Pump Heads & Tubing

The model supports the following interchangeable pump heads:

620R Mk II (continuous tubing, two rollers)
620RE and 620RE4 (LoadSure elements, two or four rollers)

These heads are compatible with various tubing materials (e.g., Marprene™, Bioprene™, Sta‑Pure™, silicone) and sizes (typically 6.4 mm to 17 mm inner diameter).

The 620RE and RE4 heads feature retractable rollers for easier cleaning (CIP/SIP) and rapid loading.

AFAB Lab Resources - Used Lab Equipment

Physical Attributes & Construction

Ingress Protection: IP31 (NEMA 2) for the standard 620S/R; there are IP66/NEMA 4X variants (e.g., 620SN/R) for environments requiring better dust and water resistance.

Weight: Around 19.6 kg (with 620R/RE head) to 20.1 kg (with 620RE4).

Sound level: Less than 70 dB(A) at 1 m—relatively quiet for continuous industrial operation.

Advanced Features

MemoDose: Delivers precise single-shot volumes—ideal for dosing applications.

Ramp function & non‑drip: Ramp improves handling of delicate fluids, preventing splashes/frothing, while non-drip minimizes residual drips at dose end (noted in related Di versions but often included in feature suites).

Data export: Some models (e.g. 620S/RE) support RS‑232 export of batch records—important for GMP compliance.

Cambridgeshire, United Kingdom

5,773 km away

Model Number

620S/R

Stock Number

45289.SR4B SR8B

Machinery Masters View

Typical context for this category of equipment. Always confirm specifics with the seller.

Accurate dosing and transfer of sensitive fluids in laboratory settings.
Chemical metering and dispensing in industrial processes.
Food and beverage ingredient addition and transfer.
Pharmaceutical and biotechnology fluid handling for sterile applications.
Water treatment chemical dosing.

Typical flow range: For this class of equipment, flow rates commonly range from approximately 0.001 L/min up to 18 L/min, depending on the pump head and tubing configuration.
Pressure capability: Units of this type are typically capable of pressures up to approximately 4 bar (60 psi).
Speed control: Fine speed control from 0.1 to 265 rpm is commonly found, offering a high turndown ratio for precise operation.
Motor type: This model features a brushless DC motor, known for reliability and precise control.
Enclosure rating: The enclosure is typically rated NEMA 2 / IP31, suitable for dry industrial environments.
Power supply: Units commonly operate at dual voltage, typically 100–120 V or 200–240 V, 50/60 Hz.
Compatible pump heads: This series typically supports interchangeable pump heads such as the 620R Mk II, 620RE, and 620RE4 for continuous tubing or LoadSure elements.
Tubing compatibility: Commonly compatible with various tubing materials (e.g., Marprene™, Bioprene™, Sta‑Pure™, silicone) and inner diameters, typically from 6.4 mm to 17 mm.

Peristaltic pumps offer gentle, low-shear pumping action, preventing contamination as the fluid only contacts the tubing. They are ideal for sensitive or abrasive fluids and provide accurate, repeatable dosing.

Peristaltic pumps are valued in laboratory and pharmaceutical settings for their gentle, non-contact fluid handling, making them suitable for delicate samples and sterile applications. When buying used units, buyers typically prioritise checking tubing condition, motor functionality, and calibration history. Industry sentiment favours these pumps for their reliability, low maintenance requirements, and consistent flow rates. Common strengths include versatility across various fluid viscosities and compatibility with corrosive or shear-sensitive media. Prospective buyers should verify spare parts availability for specific models.

General overview for this equipment type

Machinery Masters Intelligence. General guidance for this category of equipment only, not a substitute for the seller's exact specifications. Always confirm details with the seller.