Pumps, Valves & Liquid Handling


Valveless 400 µl Dispensing Pump Introduced


Fluid Metering, Inc (FMI) introduces their new 400 µl Dispensing Pump ideal for Medical, Analytical and Biotech Instrumentation. Having the identical compact design dimensions as their STH & STF OEM Pump lines, the STF1-9 expands dispense and metering capabilities of previous STH designs by 100% while maintaining 0.5% precision.


The STF1-9 is available in nine drive configurations ranging from 200 µl through 400 µl in 50 µl increments. Each drive model (STF1, STF2 … STF9) has an adjustable displacement of ±25 µl. A supplied adjustment tool rotates an eccentric bushing to precisely make micro-volume adjustments.


There are also four standard pump head options available to provide a fluid path with maximum chemical and dispense volume/flow rate compatibility.


Fluid Metering’s STF1-9 utilises FMI’s CeramPump® valveless fluid transfer technology. One moving part accomplishes both the pumping and valveless functions within the pump, thereby eliminating valves present in other reciprocating pump designs. Sapphire-hard ceramic internal components are both chemically inert and dimensionally stable, resulting in a pump that will transfer fluid, in micro-volume amounts, at a precision of 0.5% or better for millions of maintenance free cycles.


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Premium Pipette Tips Help to put the Focus on Canine Genetics


Mettler Toledo’s Rainin pipettes and TerraRack™ pipette tip racks are helping Paw Print Genetics in Spokane, USA, to offer a canine carrier screening service, enabling dog breeders to ensure the health of their animals. Kyle Sundin, Senior Manager, Development and Laboratory Operations, explained: “Paw Print Genetics is a molecular biology lab with a focus on canine genetic health. Testing for inherited conditions and traits – such as progressive retinal atrophy and hereditary cataracts – helps breeders to understand the genetics of these diseases and produce healthy animals, which is better for both the dog and its owner.”


“In our field of work, the potential for cross-contamination is a real issue; a sterile environment is essential. This begins with the pipette tip, and is one of the reasons we use TerraRacks with Rainin BioClean™ filtered tips. Previously, we used pre-racked tips for procedures performed prior to PCR, autoclaving empty boxes before refilling them to guarantee sterility. Boxes used for post-PCR procedures were simply discarded, generating large amounts of plastic waste. TerraRacks offer a high quality, premium pipette tip that ensures accurate dispensing, which is important for our work. Each box of tips is supplied presterilised, so we no longer have to spend time autoclaving them, and the impact of the waste on the environment is reduced as they use less plastic. We’ve fallen in love with them.”


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New Pen-Sized Electronic Pipette Introduced


pipetty™, from Hoefer, Inc, is the smallest and lightest electric pipettor in the world. The ultralight design ensure user comfort and precision. In addition to normal single dispensing and mixing, multiple continuous dispensing is available. The user can operate pipetty™ either using conventional or open type controls.


pipetty™ is available in three volume ranges to accommodate your needs, 2-20 µL, 25-250 µL and 100-1,000 µL. pipetty™ also has a unique ability to automatically compensate for dispensing volume variability caused by temperature fluctuations, ensuring unmatched dispensing accuracy.


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Ultra-compact, Energy-effi cient, High Flow Latching Solenoid Valve


The established, field-proven range of HDi (High Density Interface) solenoid valves available from Lee Products has recently been expanded following the introduction of a new Lo-Lohm Latching 3-Port HDI Solenoid Valve. By combining the high flow capabilities of the Lo-Lohm HDI with the power efficiency of the Latching HDI, the new 3-Port Lo-Lohm design excels in applications where high flow capacity, low power consumption and small size, are critical. Lo-Lohm means higher flow, as the Lohm is a measure of resistance to flow.


The higher flow rates and smaller size of the Lo-Lohm Latching style (as low as 550 Lohms, 14.6 LPM at 15 psid) allows instruments designers to utilise a miniature valve to achieve demanding flow rates, without sacrificing size. These ultra-compact valves weigh just 4.5 grams and measure 50mm in overall length and 7.6mm in diameter.


Depending on the application, this can result in improved efficiencies in sample processing throughput and quicker venting, both of which also ultimately mean power conservation at the system level. These valves require only a momentary voltage pulse to activate (10 ms minimum) after which they retain their flow state until a follow-on voltage pulse (with reverse polarity) is applied to switch its flow direction. Apart from the initial minimal power consumption, no power is consumed while the valve maintains each flow status. This low energy consumption (as low as 28 mJ/ switch) is particularly important for battery operated and miniaturised systems.


Other features include; low internal volumes of 40µL for the plug-in version, 72µL for the face-mount and 77µL for the ported version and they will provide a reliable and long cycle life of a minimum of 10 million cycles. Wetted materials are PBT for the housing, FeCr alloy for the armature/plunger stop, 316 SS for the spring and silicone for the seal. The low power, high flow rates and low heat generating features of these valves make them particularly suited to applications such as battery powered pneumatic instruments, portable respiratory therapy devices, molecular diagnostics instruments and environmental gas samplers.


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