Harvard Apparatus '33' Dual Infuse/Withdraw Syringe Drive Pump
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Harvard Apparatus '33' Dual Infuse/Withdraw Syringe Drive Pump


  • Dual Infuse/Withdraw Syringe Pump System
  • Channel-Independent Direction and Flow Rate
  • Reciprocal/Parallel Operation
  • Continuous Run Mode
  • TTL and RS-232 Interfaces

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This Harvard Apparatus Model '33' Dual Infuse/Withdraw Syringe Drive Pump is used and in excellent condition.

Stock # 46031-1

  • Description
  • Tech Specs
  • Datasheets / Manuals 
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The Harvard 33 Syringe Pump offers continuous infusion or withdrawal, 24 hours a day, 365 days a year with the accuracy and low flow of a Harvard syringe pump.

The Harvard 33 Syringe Pump is a breakthrough in pumping technology. The 33 has two independent pumping channels linked through hardware and software. When combined with a valve box, it provides the continuous delivery of a peristaltic or piston pump with the accuracy, absence of pulsation and low flow rates of a syringe pump.

The Harvard 33 Twin Syringe Pump opens up whole new pumping possibilities.
These are some of the applications of this pump:
• The injection of dyes, perfumes and flavoring in industrial applications
• Applications with liquids or viscous materials in micro-manufacturing
• Continuous injections of reactants into reactor vessels
• Simultaneous samplings from two sites
• Continuous injection for long term toxicology testing

Several modes of operation are available to accommodate a range of setups and experimental protocols. A unique movable limit switch mechanism is used to change direction or stop operation of the pump depending on the mode of operation.
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TypeMicroprocessor Dual Drive, Single Syringe, Infusion/Withdrawal
Minimum Syringe Size0.5 µ l
Maximum Syringe Size140 ml
Minimum Flow Rate0.0004 µ l/hr
Maximum Flow Rate106.6 ml/min
RS-232RJ11-4 conductor
TTL9-pin connector
Average Linear Force57 lbs
Voltage Range95 to 130 VAC, 60 Hz; 220 to 260 VAC, 50 Hz, selectable
Dimensions15.2 x 31.1 x 28.6 cm (6 x 12.5 x 11.25 in)

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Manuals, Datasheets, Drivers, Links

Harvard Model 33 Manual (pdf) 
Model 33 Product Datasheet (pdf) 
Link to Harvard Apparatus Website