120DM3 three-channel laboratory pump

Ultra low flow metering

Ultra low flow metering

400U/DM3 three channel pumphead, using manifold tubing for ultra low-flow metering.
Small, simple, precise

Small, simple, precise

Multi-channel pump features a keypad lock. The security of your process and product is safe
Maintenance-free brushless DC motor

Maintenance-free brushless DC motor

Superior speed control up to 10,000:1, ±1% set speed and IP31 ingress protection for wipedown environments

Contact us

To order this product please contact us on:

Telephone: +64 (0)9 273 3166

Fax: +64 (0)9 273 3167

You can also send us an email


120 Peristaltic pumps brochure

120 Peristaltic pumps brochure

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The Watson-Marlow 120U/DM3 and 120S/DM3 pumps comprise a 400DM3 three-channel pumphead powered by a 120 variable speed or automatic drive. The pumphead accepts 0.8mm wall, three-bridge manifold tubing in sizes from 0.13 to 2.79 mm internal diameter. The pump gives flow rates up to 36 ml/min.

120 pumps are compact, saving valuable space in cleanroom, LAF and biosafety cabinet installations.

120U/DM3: 0.1-100 rpm in 0.1 rpm increments. Manual remote control or automatic control via 4-20mA or 0-10V inputs. Speed scrolling, priming and keypad lock.

120S/DM3: Manual control, 1-100 rpm in 1 rpm increments. Speed scrolling, priming and keypad lock.

Flow rates 0.0001 to 36 ml/min at 2 bar (30 psi) 

  • Compact footprint requires minimal benchtop space
  • Superior speed control up to 1,000:1, ±1% set speed accuracy, repeatable flow
  • 400DM3 three-channel pumphead accepts three-bridge manifold tubing only
  • Efficient and intuitive to use, requiring minimal key presses
  • Smooth, wipedown case with no sharp edges to tear gloves and no bug traps. IP31 ingress protection
  • Maintenance-free, brushless DC motor
  • Three year warranty

Fermentation The 120 is the perfect pump for maximizing yield in fermentation and cell culture applications. Ultra-compact and stackable for multiple feeds such as pH control, antifoam, nutrient and buffer addition, the 120 offers the ideal combination of size and technology to optimise your process.

Single-use systems The new 120 pump is perfectly suited to single-use systems where no contamination can be accepted. Error-free tube change takes only seconds.

Process validation The biopharm process requires accurate and repeatable pumping which is easy to validate. With an exceptional 1,000:1 speed range, the 120 delivers the flexibility and purity so vital to drug trials. A keypad lock secures your pumping parameters for constant and repeatable performance.


Functionality 120U/DM3 120S/DM3
Manual control    
1 to 100rpm (100:1)
0.1 to 100rpm (1000:1
Numerical speed display
Direction change
Max (prime)
Auto start
Remote control    
Run/stop, direction change, auto/man toggle, alarm  
Analog control    
0.01 to 100rpm (10,000:1)  
Analogue speed input; 4-20mA, 0-10V  
Tacho speed output; 0-5V  
Keypad lock to protect set-up


Tube bore and flow rates 120S/DM3 and 120U/DM3 (ml/min)

  Speed (rpm)  0.13mm  0.19mm  0.25mm  0.38mm  0.50mm 
120S 1-100 0.001-0.1                 0.002-0.2    0.004-0.4     0.008-0.8    0.014-1.4
120U 0.1-100 0.0001-0.1                   0.0002-0.2  0.0004-0.4
0.0008-0.8 0.001-1.4
Speed (rpm)  0.63mm 0.75mm  0.88mm  1.02mm  1.14mm 
120S 1-100 0.089-8.9                   0.110-11    0.120-12  0.140-14    0.180-18 
120U 0.1-100 0.009-8.9                    0.011-11  0.012-12    0.014-14   0.018-18
Speed (rpm) 1.29mm                       1.42mm  1.52mm   1.65mm  1.85mm
120S 1-100 0.089-8.9             0.110-11    0.120-12     0.140-14      0.180-18
120U 0.1-100 0.009-8.9                   0.011-11    0.012-12   0.014-14  0.018-18
Speed (rpm) 2.05mm               2.38mm  2.54mm  2.79mm  
120S 1-100               0.210-21    0.260-26   0.310-31    0.360-36  
120U 0.1-100                0.021-21    0.026-26    0.031-31  0.036-36  


400DM3 three-channel pumphead

The three-channel 400DM3 pumphead uses three-bridge manifold tubing. Ideal for ultra-low-flow metering. Available for 120S and 120U drives.


114DV flip-top four roller pumphead

The 114DV single-channel pumphead assures trouble-free continuous tube loading in seconds, high accuracy and repeatable flow. It accepts 1.6mm wall tubing in bores sizes 0.5mm to 4.8mm.


102R single-channel two roller pumphead

The 102R single-channel pumphead with two-roller rotor is suitable for continuous silicone tubing. It accepts tubing in bore sizes 0.5mm to 4.8mm.


400DM2 twin-channel pumphead

The twin-channel 400DM2 pumphead uses three-bridge manifold tubing. Ideal for ultra-low-flow metering. Available for 120S and 120U drives.


400D1 single-channel pumphead

The single-channel 400D1 pumphead accepts 1.6mm-wall tubing from 0.5mm to 4.0mm.

This metering pumphead is familiar to users replacing older 101 and 400 series pumps with the 120. Suitable for 120S and 120U drives.


120U offers 0.1 to 100rpm manual remote control of the pump in 0.1rpm increments or automatic control in 0.1rpm increments via 4-20mA or 0-10V inputs.

120S offers 1-100rpm operation in 1rpm increments

Datasheet download

120DM3 datasheet

Manual download

Tubing and hoses for your industry

  • Contact us

    To order this product please contact us on:

    Telephone: +64 (0)9 273 3166

    Fax: +64 (0)9 273 3167

    You can also send us an email