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Pumps

  1. Choosing a Pump for your Fluid Handling Application
    October 04, 2015
    The type of pump you choose for your fluid handling will largely depend on your laboratory application. In this article, we will compare the popular pump types. Peristaltic Pumps A peristaltic pump has a series of rollers that rotate around the edge of the pump head. A flexible tubing is threaded around the rollers and pressed up tight next to them, pinching the tubing where it contacts a roller. As the rollers rotate around the head, the fluid in the tubing moves from the input to the output. The rate of head rotation and the size of the tubing determine the volume of fluid that can be pumped. The volume that can be pumped is limited only by the volume of the input source. Syringe Pumps A syringe pump consists of a syringe attached to a motor driven pusher block
  2. When a Bigger Bolus is Better
    June 12, 2015
    First, let's consider volumes. A milliliter (mL) is one thousandth the volume of a liter (L) or 10-3L A microliter (µL) is one thousandth the volume of a mL (10-6L) A nanoliter (nL) is one thousandth the volume of a µL (10-9L) A picoliter (pL) is one thousandth the volume of a nL (10-12L) This is graphically represented at the right. Notice that the mL is one trillion times larger than the picoliter. The table (right) shows that the side of a cube with a volume of 1mL is 1cm long. Likewise, the side of a cube with a volume of 1pL is 10µm long. Just for comparison, it shows that the diameter of a sphere with a volume of 1mL is 1.24cm, and the volume of a sphere with a volume of 1pL is 12.4µm. With these volume comparisons in
  3. Low Flow Dampening Kit for a Pump
    December 08, 2014
    Parts List Qty Part Number Description 2 13163 MALE LUER FITTING 5/32 2 13161 MALE LUER FITTING FOR 3/32 2 13157
  4. Nanoliter Troubleshooting
    May 01, 2013
    The Nanoliter injector is a micro-processor controlled injection system that uses direct piston displacement. The collet assembly (exploded view) is shown in the image below. The glass pipette fits into the white, plastic sleeve (spacer). When the collet is screwed in place securely, the black rubber washers are compressed and hold the glass firmly in place. Nanoliter 2000 A side view of the assembled Nanoliter injector is shown below. Nanoliter 2010  As the plunger is depressed, it pushes into the glass to expel the liquid in the pipette. Eventually, the diameter of the plunger matches that of the glass,
  5. Micro Injection Setup 101
    April 29, 2013
    When it comes to setting up microinjection systems, the options appear endless. The pictures below give some broad suggestions on how you might set up your own system. Keep in mind that many parts are interchangeable depending on your needs or preferences. In general, you will need a stereo microscope on a stand, a light source, one or two micromanipulators with stands, and one or two injection systems. The following images show various setups for microinjection, and all the WPI part numbers are included for easy reference. Remember, when you set up your own system, choose the parts that fit your needs. For example: M10 or the M9 magnetic base could be used.
  6. Choosing the Correct Pump
    April 29, 2013
     WPI carries a wide variety of fluid handling tools utilizing three different technologies: peristaltic pumps syringe pumps pneumatic injectors The range of applications and the criteria used to select a particular pump or injector is broad and complex, and we encourage you to phone (866.606.1974 in the USA) or email (customerservice@wpiinc.com) us and speak to a technical support specialist. In the meantime, we have tried to simplify the process by listing all of the pumps
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