The Watson-Marlow 323 Series Digital Peristaltic Pump is a laboratory and process fluid-transfer pump designed for controlled, accurate and reversible pumping of liquids through flexible tubing. The photographed unit clearly shows the Watson-Marlow branding, 323 series marking, digital RPM display and dedicated START, STOP, MODE, speed and direction controls.

The 323 series uses a peristaltic pumping principle in which the pumphead compresses flexible tubing to move fluid through the line without direct contact between the pumped liquid and the pump mechanism. This makes the system suitable for applications where contamination control, gentle fluid handling and easy tubing replacement are important.

Watson-Marlow’s 323 range includes several drive configurations, including 323E, 323S, 323U and 323Du. Depending on the exact drive and pumphead configuration, the series supports speed ranges from approximately 3–400 rpm and multiple pumphead/tubing configurations. The exact suffix and pumphead fitted to the photographed unit are not visible, so the listing is conservatively identified as a 323 Series pump.

Applications

The Watson-Marlow 323 Series is suitable for controlled liquid transfer, dosing, sampling, laboratory fluid handling and process applications. Different pumphead and tubing combinations allow the same drive platform to handle a wide range of flow requirements.

Typical applications include laboratory sample transfer, reagent dosing, pharmaceutical processing, biotechnology, chemical processing, water treatment and general fluid dispensing. The peristaltic design is particularly useful when the fluid should remain isolated from the pump mechanism and only contact the replaceable tubing.

Main Features

Watson-Marlow 323 Series digital peristaltic pump
Digital RPM display
Variable-speed operation
START and STOP controls
Adjustable speed using UP/DOWN controls
MODE selection
Reversible pumping direction
Peristaltic tubing-based pumping principle
Compatible with multiple Watson-Marlow pumpheads
Compatible with different tubing sizes and materials
Suitable for continuous and controlled liquid transfer
Keypad-control functions depending on exact 323 model
Compact laboratory/process pump design
Suitable for laboratory and industrial fluid-handling applications

Technical Specifications

Specification	Details
Brand	Watson-Marlow
Series	323
Product Type	Digital Peristaltic Pump
Pumping Principle	Peristaltic
Speed Display	Digital RPM
Speed Range	Approximately 3–400 rpm, depending on model/configuration
Pumphead	Configuration dependent; not fully visible
Tubing	Pumphead/tubing dependent
Flow Rate	Configuration dependent
Direction	Forward / Reverse
Controls	Start, Stop, Mode, Speed Up/Down, Direction
Displayed Speed in Photograph	165 rpm
Speed Resolution	Model dependent; some 323 models provide 1 rpm increments
Maximum Flow	Up to approximately 3,000 mL/min depending on pumphead/tubing configuration
Minimum Flow	Down to approximately 0.002 mL/min depending on configuration
Power Supply	100–120 V or 220–240 V, 50/60 Hz depending on version
Power Rating	Approximately 100 VA
Ingress Protection	IP31
Operating Temperature	Approximately 5–40 °C
Condition	Used / Refurbished
Exact Model Suffix	To be verified
Pumphead Configuration	To be verified
Accessories	Tubing, pumphead accessories and fittings subject to availability

Watson-Marlow’s current 323-series documentation lists multiple configurations with speed ranges from 3–400 rpm, depending on the drive model and configuration. The series can accommodate 313D, 314D, 501RL, 314MC and 318MC pumpheads, with flow dependent on tubing bore, pumphead and drive configuration.

For example, with a 313D pumphead, published performance ranges from approximately 0.81–110 mL/min with 1.6 mm tubing up to 15–2,000 mL/min with 8.0 mm tubing for applicable 323 configurations. These figures are configuration-dependent and should not be treated as the guaranteed flow rate of the photographed unit.

Benefits of Refurbished Laboratory Equipment

Refurbished Watson-Marlow pumps provide laboratories and processing facilities with access to established peristaltic pumping technology at a lower acquisition cost than purchasing new equipment. The 323 platform is particularly flexible because different pumpheads and tubing sizes can be selected according to the required flow rate and application.

The peristaltic design also allows the pumped liquid to remain within the tubing, which can simplify cleaning and reduce contamination between the fluid and mechanical components. Before use, the pump should be inspected for drive operation, speed accuracy, pumphead condition, tubing compatibility, direction control and electrical safety.

Additional Information

This Watson-Marlow 323 Series pump is a previously used laboratory/process pump with visible signs of use. The photograph shows the 323 digital drive and a pumphead/tubing interface, but the exact model suffix such as 323E, 323S, 323U or 323Du is not visible.

The exact pumphead, tubing size, flow rate, electrical version and service history should be verified before purchase. Tubing is a consumable and should be replaced with tubing compatible with the selected pumphead and application.

Refurbished Condition

This is a refurbished Watson-Marlow 323 Series Digital Peristaltic Pump. The instrument has been professionally inspected and tested. Reagents, accessories, software and consumables may vary depending on availability.

Watson-Marlow 323

Refurbished Watson-Marlow 520S Peristaltic Pump