Têtes de pompe Masterflex L/S : le guide ultime

• The tubing is placed in the tubing bed (between the rotor and the housing) where it is occluded.
• When the rotor turns, the rollers move across the tubing, pushing the fluid. Once the tubing recovers its shape, it creates a vacuum which draws fluid.
• This creates a "pillow" of fluid between the rollers. Flow rate is determined by multiplying speed by the size of this pillow.

How to choose your Masterflex L/S pump head?

• Define the flow rate required for your application. Some pump heads are more efficient at low flow rates, other more performant at higher flow rates.
• Will the pump head be exposed to harsh chemicals/environment? If yes, consider choosing housing and rotor materials that are resistant to these external constraints.
• Does the accuracy/pulsatility of the flow have an impact on your experiment? If yes, you should choose a pump head with more rollers, which will minimize the pulsation and increase its accuracy.
• How many channels do you need? Multichannel pump heads (up to 32 simultaneous channels) are extremely convenient to multiplex your experiments, but also more expensive and less versatile compared to separate pump heads.

Types d'occlusion

Occlusion defines how the tubing is "squeezed" by the rollers. It has an impact on the tubing performance and output flow.

• Standard fixed occlusion: occlusion is fixed at slightly different levels for each tube size to maximize its performances (flow, vacuum, tubing life). Pump heads with this occlusion type generally only accept one tubing size (e.g. Standard pump head).
• Average fixed occlusion: occlusion is fixed at an average level for several tubing sizes, allowing for fast tubing change and compatibility with different tubing sizes without changing the pump head.
• Adjustable occlusion: occlusion can be adjusted by the operator for optimal pump performance (e.g. Easy-Load II or Cartridge pump heads).

Matériaux

Masterflex pump heads are made of 3 main parts: the rotor, the rollers, and the housing. While some materials are chosen for their resistance to harsh environments, others increase the pump head life or optimize its efficiency.

Boîtier de pompe :

• Polycarbonate (PC) : pour les applications générales, translucide
• Sulfure de polyphénylène (PPS) : meilleure protection contre les fluides/vapeurs corrosifs
• Acier inoxydable (SS) : résistant aux fluides corrosifs
• Polyarylamide (PARA) : rigidité élevée et surface lisse
• Aluminium : résistant aux fluides corrosifs
• Nylon PA renforcé de verre : haute rigidité et résistance mécanique

Roller/rotor:

• Acier laminé à froid (CRS) plaqué : pour les applications générales
• Acier inoxydable (SS) : résistant aux fluides corrosifs, durée de vie la plus longue
• Aluminium : résistant aux fluides corrosifs

Compatible tubing for L/S pump heads

L/S pump heads are compatible with L/S tubing, but not all sizes. The following tables give the correspondance between tubing name and nominal inner diameter (ID), along with the compatibility of these tubing sizes with Masterflex L/S pump heads.

Masterflex L/S pump heads comparison

Masterflex offers a broad range of pump heads, each with its own features. You will find below a comparison of Masterflex L/S pump heads, with their main specifications and key features.

If you have any questions about the Masterflex range or need some help choosing the best peristaltic pump for your application, do not hesitate to contact us!