Variable-Speed Peristaltic Pump

What is the Variable-Speed Peristaltic Pump?

A variable-speed peristaltic pump is a single-channel drive with adjustable rotation speed for continuous liquid transfer and general dosing. It is the standard laboratory pump for media, buffers and reagents from microliters to liters per minute.

Overview

The variable-speed peristaltic pump pairs a stepper or brushless DC motor with a single pump head. Speed is set by a dial or digital keypad and may range from 1 to 600 rpm, giving flows from about 0.001 to several liters per minute depending on tubing. Direction can be reversed for draining or purging. Many drives offer a reversible motor, timer, and remote control through analog or RS232 signals. Flow accuracy is typically 1 to 3 percent after calibration, and pulsation is low at high speed. The pump head accepts a range of tubing sizes, and quick-release heads simplify tube changes. Because it is easy to set up and clean, this is the most common peristaltic pump format in laboratories, used for filling, transferring, recirculating and feeding fluids in research and routine operations.

How does it work?

A peristaltic pump has a rotor carrying two or more rollers that press the tubing against a curved raceway. As the rotor turns, the rollers occlude the tube and push a trapped volume of liquid forward, while the tube behind the roller recovers and draws in more fluid. The displaced volume per revolution depends on the tube bore and wall, so flow is set by tube size and rotation speed. Because the fluid stays inside the tubing, the pump head never touches the sample, giving excellent chemical compatibility and making sterilization simple: replace the tubing or use pre-sterilized sets. Flow is nearly pulseless at higher speeds but slightly pulsed at low speeds and with few rollers. Typical components are the drive motor, pump head, tubing, and a control interface for speed, direction and sometimes calibration.

What are the key features?

• Single channel with adjustable speed of 1–600 rpm
• Flow from about 0.001 to several L/min by tubing size
• Reversible direction for draining and purging
• Timer and remote control options
• Quick-release pump head for fast tubing changes
• Calibrated accuracy of about 1–3 %

What are the technical specifications?

A typical variable-speed peristaltic pump configuration offers speed range of 1–600 rpm, flow range of 0.001–3,000 mL/min, number of channels of 1, tubing sizes of 1.6–9.5 mm inner diameter, speed accuracy of ± 0.5 % and flow accuracy after calibration of ± 1–3 %. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Variable-Speed Peristaltic Pump is used in media and buffer transfer, reagent dosing, recirculation in reactors, chromatography mobile phase feed and filling and dispensing tasks. Across the wider Peristaltic Pumps class, laboratories also deploy it for sterile media and buffer transfer, reagent dosing and metering and continuous flow chemistry.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 61326-1, ISO 9001, USP <87>, USP <88> and GB 4793.1. Certification candidates for this model are CE, RoHS and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Tubing is the main consumable and also the calibration reference, so keep the same part number and replace it on a schedule or when flow drifts. Recalibrate after changing tubing, since wall thickness and elasticity affect volume per revolution. Avoid over-tightening the pump head, which shortens tube life, and do not run dry for long periods unless the tubing is rated for it. Keep the raceway and rollers clean, and check for wear that causes uneven flow. For sterile or hazardous liquids, work inside a biosafety cabinet and use closed tubing sets. Follow IEC 61010-1 for electrical safety. In flow chemistry and metering applications, verify against a balance or flow meter, and record tubing lot and calibration data so results remain traceable.

How do I select the right Variable-Speed Peristaltic Pump?

Choose the variable-speed model for general transfer and dosing on a single stream. For parallel streams choose a multi-channel unit, and for automated volume dispensing choose a dispensing drive. In the RFQ, state flow range, tubing material and size, control interface and accuracy.

How does it compare with other Peristaltic Pumps variants?

Start with flow range and tubing size. Small-bore tubing gives microliter flows for microfluidics and dosing, while large-bore tubing moves liters per minute for media transfer and process work. Confirm the tubing material for chemical compatibility and temperature: silicone is flexible and autoclavable, while PharMed or Viton resist solvents and high temperatures. Decide whether you need a single channel or several channels running in parallel, and whether channel-to-channel accuracy matters. Choose the drive for speed range, torque and control features such as dispensing, ramp profiles, remote control and data output. For sterile work, look for autoclavable or disposable tubing sets and quick-release heads. Consider pulsation where smooth flow is important, since more rollers and higher speeds reduce it. Add calibration to convert speed into a reliable volume.