300 Series Laboratory Pumps

Watson Marlow Pumps

Industrial equipment

The 300 Series laboratory pumps are a benchtop solution for pumping liquids with manual, remote, analogue or RS232 control capabilities. The 323 Series pumps feature a chemically resistant ABS top and IP31 protection, a membrane keypad for pump control, and a digital LCD to display speed.

Four models with increasing functionality are available:
323Du High-flow pumps with enhanced RS232/auto/manual control
323U and 323U pumps with analogue auto and enhanced manual control
323S High-flow manual control pumps
323E Manual control pumps

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300 Series Laboratory Pumps

About the Product

The Watson-Marlow 300 Series is a versatile range of laboratory peristaltic pumps engineered for applications requiring higher flow rates, flexible control, and reliable fluid handling. Delivering flow rates of up to 3,000 mL/min, the series supports a wide range of compatible pumpheads, making it ideal for research laboratories, pilot plants, and OEM equipment.

The range includes drive options with manual, analogue, remote, and digital control, including RS232 connectivity, allowing seamless integration into automated laboratory systems, test rigs, and process development equipment.

A key advantage of the 300 Series is its compatibility with multiple pumphead configurations—from standard single-channel models for continuous transfer to multi-channel microcassette pumpheads for precision laboratory dosing. This enables a single drive to support a wide variety of applications without the need to replace the pump.

The drive features a chemically resistant ABS enclosure, a digital LCD display, and a membrane keypad for intuitive operation. Functions such as keypad lock, reverse operation, and MemoDose help ensure consistent, repeatable performance while protecting operator settings and simplifying routine operation

Applications

300 Series Laboratory Pumps

Biotechnology & Research

Precise transfer of culture media, buffers, and reagents for cell culture applications, as well as continuous fluid handling in university laboratories, research institutes, and scientific facilities.

Pharmaceutical Laboratories

Reliable dosing of reagents, sample preparation, and laboratory testing in controlled pharmaceutical research and development environments.

Pilot Plants & OEM Equipment

Ideal for pilot-scale process development and scale-up before full-scale production. A wide selection of compatible pumpheads and control options also makes the 300 Series an excellent choice for OEM integration.

Medical & Diagnostic Devices

Designed for integration into analytical instruments, diagnostic systems, and OEM equipment requiring stable, accurate, and repeatable fluid delivery.

Manual or remote 4 mA to 20 mA or 0 V to 10 V analogue auto-control or RS232 control commands

Enhanced digital manual speed control up to 133:1

Keypad lock prevents unauthorized access or accidental changes to settings

MemoDose function for accurate single dosing

Digital TTL inputs for run/stop and direction

Instant reverse

Two-year warranty

Pump head options available as standard (others available on request):

313D and 313D2 three-roller pump heads for continuous tubing

314D and 314D2 four-roller pump heads for continuous tubing

314MC four-roller five-channel microcassette pump heads

318MC eight-roller five-channel microcassette pump heads

501RL and 501RL2 pump heads for continuous tubing

300 Series Laboratory Pumps

Specifications

Maximum Flow Rate
300 ml/min

Minimum Flow Rate
0.002 ml/min

Speed Control Ratio
133:1, 147:1, 200:1, 27:1, 300:1

Ambient Temperature Range
5 °C to 40 °C

Standards
CE, cETLus

Drive Ingress Protection
IP31

Drive Power Supply
1 Phase, 100 V to 120 V, 220 V to 240 V 50/60 Hz, 100 VA

Compatible Tube DIA (mm)
0.13, 0.19, 0.25, 0.38, 0.5, 0.63, 0.76, 0.8, 0.88, 1.02, 1.14, 1.29, 1.42, 1.52, 1.6, 1.65, 1.85, 2.05, 2.29, 2.54, 2.79, 3.2, 4.8, 6.4, 8