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Watson-Marlow operates a policy of continuous product improvement. As new models are introduced, old models are phased out. This guide makes clear which models have been discontinued, and what is the recommended replacement.
The following list refers only to drives. The pumphead shown should not be considered. The pumps pictured are representative and not necessarily a specific model.
Discontinued drive and pump | Replacement drive and pump |
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313F 313F/D
313S 313S/D
313U 313U/D
313T 313T/D |
323E 323E/D Details
323S 323S/D Details
323U 323U/D Details
323D 323Dz/D 323Dz/RL Details |
You get more:
Enhanced control features
Keypad control with speed display
Increased power and speed control range
Brushless DC motor |
Discontinued drive and pump | Replacement drive and pump |
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504S 504S/RL 504S/RL2 504S/L 504S/D
504U 504U/RL 504S/RL2 504U/L 504U/D
504Du 504Du/RL 504Du/RL2 504Du/L 504Du/D
504S 12V 504S/RL |
520SN 520SN/R 520SN/R2 520SN/L 520SN/D Details
520UN 520UN/R 520UN/R2 520UN/L 520UN/D Details
520DuN 520DuN/R 520DuN/R2 520DuN/L 520DuN/D Details
None - Consider an OEM drive in an NEMA 4X enclosure |
You get more:
Ingress protection upgraded from IP55 to IP66, NEMA 4X
Speed control range 2200:1
One model now covers the 55rpm and 220rpm drives
520R2 pumphead with 2.4mm wall tube enhances performance, including 59% more flow
Additional control features
5 year warranty |
Discontinued drive and pump | Replacement drive and pump |
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505S 505S/RL 505S/L 505S/D
505U 505U/RL 505U/L 505U/D
505Du 505Du/RL 505Du/L 505Du/D |
520S 520S/R 520S/R2 520S/L 520S/D Details
520U 520U/R 520U/R2 520U/L 520U/D Details
520Du 520Du/R 520Du/R2 520Du/L 520Du/D Details
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You get more:
59% more flow with new 520R2, 2.4mm wall pumphead fitted. Use 520R for 1.6mm wall tube
Speed control range 2200:1
Higher torque from brushless DC motor
Additional control features
Still able to fit a number of different pumpheads
5 year warranty |
Discontinued drive and pump | Replacement drive and pump |
 |  | | 505Dz 505Dz/RL |
323Dz 323Dz/RL 323Dz/D Details | You get more:
Improved programming
Additional features
Available for use with 501RL and 313/314 pumpheads |
Discontinued drive and pump | Replacement drive and pump |
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503P 503P/RL 503P/RL2 503P/L 503P/D |
521P 521P/RC 521P/R2C Details
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You get more:
Industrial air motor, runs quieter
Lower cost
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Discontinued drive and pump | Replacement drive and pump |
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| 501 Close-coupled 501F/RL 501DF/RL
501I/RL 501TI/RL 501DV/RL |
521 Close-coupled 521F/RC
521DF/RC 521I/RC 521TI/RC 5211DV/RC
521VI/RC Details |
You get more:
The 520R2C pumphead (2.4mm wall) offers higher flows with better flow stability over the 520RC (1.6mm wall)
Careful motor selection has enabled use of smaller frame size motors, so taking less space, reducing weight and lowering running costs |
Discontinued drive and pump | Replacement drive and pump |
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501B baseplate 501FB/R 501VB/R 501DFB/R
501DVB/R |
521 Close-coupled 521F/RC 521DF/RC 521I/RC 521TI/RCL
5211DV/RC 521VI/RC Details |
You get more:
Simpler build allows all baseplate features at much reduced cost with enhanced performance from 520R2 pumphead
Also available as ATEX configuration |
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Discontinued drive and pump | Replacement pump |
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623S 623S/R |
620S/R 620S/RE Details |
You get more:
50% more flow with a 50% smaller foot print
Brushless DC motor, 2650:1 turndown, 0.1% set speed accuracy
NEMA 4X wash-down and dustproof enclosure suitable for heavy industrial environments
5 year warranty |
Discontinued drive and pump | Replacement pump |
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624S 624S/R 624S/RE 624S/L
624U 624U/R 624U/RE 624U/L |
NEMA 2 - 620S/R 620S/RE
NEMA 4X - 620SN/R 620SN/RE Details
NEMA 2 - 620U/R 620U/RE
NEMA 4X - 620UN/R 620UN/RE Details |
You get more:
50% more flow with a 50% smaller foot print
Brushless DC motor, 2650:1 turndown, 0.1% set speed accuracy
NEMA 4X wash-down and dustproof enclosure suitable for heavy industrial environments
Remote control via contact closure or 5VTTL to 24V industrial logic Digital status outputs (configurable) via four relays (N models)
Analogue speed control using programmable inputs (0-10V or 4-20mA) and 0-10V output (8 bit)
Speed feedback from 0-1478Hz tachometer output
5 year warranty |
Discontinued drive and pump | Replacement pump |
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624Di 624Di/R 624Di/RE 624Di/L |
IP31 - 620Di/R 620Di/RE 620Di/L
IP66 - 620DiN/R 620DiN/RE 620Di/L
Details |
You get more:
Keypad entry of flow rates from 0.003 litre/min to 13 litre/min
Dispenses 500ml to within +/-0.5% in 2.7 seconds
Stores up to 50 dispensing programs
PIN-secure Process Protection; full pump configuration protected by dual operator/supervisor PIN codes
Export batch records via RS232 to a PC or printer for cGMP requirements
50% more flow with a 50% smaller foot print
Brushless DC motor, 2650:1 turndown, 0.1% set speed accuracy
NEMA 4X wash-down and dustproof enclosure suitable for heavy industrial environments
5 year warranty |
Discontinued drive and pump | Replacement drive and pump |
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603P 603P/R 603P/L |
621P 621P/R 621P/RE 621P/L Details |
You get more:
Upgraded to accept the new 620R pumphead with either continuous tube or with 620RE LoadSure elements
Simpler build means lower cost |
Discontinued drive and pump | Replacement drive and pump |
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601B baseplate 601FB/R 601VB/R
601DFB/R 601DVB/R |
621 Close-coupled 621F/R 621DF/R 621I/R 621TI/R 621DV/R 621VI/RE Details |
You get more:
Less space required and lower cost
Also available as ATEX configuration
Upgraded to accept the new 620R pumphead with either continuous tube or with 620RE LoadSure elements |
Discontinued drive and pump | Replacement drive and pump |
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601 Close-coupled 601F/R 601DF/R
601I/R 601TI/R 601 DV/R |
621 Close-coupled 621F/R 621DF/R 621I/R 621TI/R 621DV/R 621VI/R Details |
You get more:
Upgraded to accept the new 620R pumphead with more positive tube clamping for continuous tube or with the 620RE which enhances performance and offers easier tube changing with LoadSure elements |
The following list refers only to pumpheads. The pumps pictured are representative.
Discontinued Head | Replacement Head |
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202AA 202BA |
202CA Details |
You get more:
Superior track profile geometry and materials
Still available as 4, 8, 12, 16 way with 12 or 16 channel extension heads
Fits to 205 or 500 series cased drives |
Discontinued head | Replacement head |
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501RL
501RL2 |
520R Details
520R2 Details |
You get more:
520R2 pumphead is designed to take up to 9.6 bore x 2.4 wall tube. 520R uses 1.6 wall tube
Larger track radius enables more flow at same speed as 501RL, resulting in longer tube life
Tougher guard with improved snap-shut, tool-unlocking latch
More chemically resistant
Roller bearings for better long-term occlusion reliability |
Discontinued head | Replacement head |
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601R |
620R Details |
You get more:
The 620R pumphead has a snap-shut, tool-unlockable front guard
Accepts all the same size continuous tubes as the 601R. Easier tube loading and more positive tube retaining
The 620R and 620RE are not retro-fittable to a close-coupled or cased drive manufactured for the 601R pumphead |
Discontinued head | Replacement head |
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601R |
620RE Details |
You get more:
Uses LoadSure elements. The thicker wall enhances performance over continuous tube
The element connectors enable quicker and more positive tube loading - available as Cam and Groove or Tri-clamp |
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