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27 Pumps, Valves & Liquid Handling


pressure, high-temperature syringe pumps – i.e. pumps equipped with a heatable syringe – that can achieve low fl ow rates are suitable for use in core fl ooding experiments.


It is now also possible to use gastight syringes to perform specifi c micro-vaporisation operations, for example in the fi eld of microchip fabrication.


The use of syringe pumps that are able to transport exceptionally small fl uid fl ows in the nL range is growing greatly. In the fi elds of microfl uidics (behaviour of fl uids in very small spaces), fl ow chemistry (reactions in continuously fl owing fl uids) and microreaction technology, the freedom from pulsation of the generated fl uid fl ows is extremely important.


In instrumental analytics, syringe pumps are used for the implementation of chromatographic methods in the fi elds of HPLC (High Performance Liquid Chromatography) and LC-MS (Liquid Chromatography/Mass Spectrometry) in order to minimise background noise during electrochemical detection through the high-precision, stable transportation of the mobile phase.


Finally, it is also necessary to consider one other extremely important area of application. When conducting analytical examinations of very small concentrations, it does not make sense to produce the stock solutions required for calibration using normal dilution methods. In such cases, syringe pumps that are able to dispense very small volumes (µL or nL) of solutions with known, analytically controlled proportions of elements to a high level of precision are extremely suitable. This should fi nally make it possible to develop reference processes for use in specialist areas of nanotechnology or in the fi eld of the life sciences.


The new Syringe Pump from Spetec


To make the advantages of using syringe pumps clear once more, let us describe the SYMAX syringe pump (Figure 3) in more detail here.


The SYMAX syringe pump was designed to meter different fl uids in the microliter and nanolitre range. The mechanical highlights are the gearless stepper motor for the carriage drive, the high-precision carriage itself, the adjustable syringe holder (see Figure 2) and the resulting possibility of replacing syringes. The extremely high resolution of 25,600 individual steps per revolution makes each step imperceptible while simultaneously guaranteeing the transportation of exactly 4 pL per pulse when using a standard syringe. Depending on the volume of the employed syringe, the total amount delivered is between 0.5 nL and 44 mL per minute. Both disposable and metal-free precision syringes can


Figure 3. The SYMAX syringe pump


be used in the adjustable holder as required. If it is necessary to dispense a number of different fl uids, it is possible to operate up to six units at a single USB interface and this number can be doubled as an option. An individual unit or the entire system can be confi gured from a PC.


Using a software-controlled 3-way valve for switching between metering and fi lling or suction mode, it is possible to refi ll the syringe without having to remove it from the adjustable holder. Metering operation can also be started using a foot switch so that the operator always has both hands free.


Thanks to the software, the SYMAX syringe pump is even more versatile in use. One basic functionality is the individualised adaptation of the fl ow during metering and fi lling. In addition, it is possible to set the unit for continuous fl uid delivery over a given period or specify the minimum transport volume per individual step. This also applies to the automatic repeat cycles, rest times, emptying and fi lling level of the syringe and the control of the solenoid valve.


The software and fi rmware can be updated via the Internet. The SYMAX syringe pump is a state-of-the-art device that permits a wide range of applications in the research and development fi elds as well as in industrial practice.


Read, Share and Comment on this Article, visit: www.labmate-online.com/articles Pipette Tip Racks Enhance Process Security for CROs


Pelago Bioscience in Solna, Sweden, is taking advantage of the enhanced process security and convenience offered by Mettler Toledo’s Rainin TerraRack™ pipette tip racks. Dr Charlotta Norling, Project Leader at Pelago, explained: “We perform contract research activities for the pharmaceutical industry, with a particular focus on drug-target interactions in early drug discovery. We use high quality Rainin pipettes throughout the company, because we only have a very limited amount of each drug candidate, and our studies are time sensitive, meaning we cannot afford any pipetting issues which may compromise results for our customers.”


“To save on bench space, we generally use stackable pipette tips for most of our work, but we have recently switched to Rainin TerraRacks in our cell biology laboratory. Sterility is vital for this work, and the risk of contamination when using stackable tips was unacceptable. The TerraRacks are ideal, as they come pre-sterilised. This saves a lot of work in terms of sterilising the tips in house, and each rack has a hinged lid to ensure they stay clean – we’ve had no sterility issues with TerraRacks. The colour-coding also makes it very easy to see which tip size you have – they are ideal for our cell lab and complement our Rainin pipettes well.”


Titration, dispensing or pipetting, 40945pr@reply-direct.com


Hirschmann makes your laboratory work speedier, safer and more accurate.


Hirschmann – HiClass in the lab. New Dual Independent Channel Syringe Pump


Harvard Apparatus is pleased to announce the release of their latest syringe pump. The Harvard Apparatus Pump 33 DDS (Dual Drive System) is a leap forward in syringe pump capability. The Pump 33 DDS has two independent pumping channels controlled by an intuitive touch screen interface. This multi-purpose syringe pump employs advanced syringe mechanisms that include a tight gripping, extremely secure syringe clamp that accommodates syringe sizes 0.5 µl to 60 ml. The Pump 33 DDS offers enhanced flow performance with high accuracy and smooth flow from 1.02 pl/min to 106 ml/min.


The new Harvard Apparatus Pump 33 DDS employs a graphical user interface controlled with a large 7” LCD Colour Touch Screen. Features include: run two separate flows using different directions, flow rates, volumes and syringe sizes; integrated syringe manufacturer tables; high accuracy ± 0.25%; USB, RS-232 & TTL connectivity.


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Fon +49 7134 511-0 · Fax +49 7134 511-990 Hauptstraße 7-15 · 74246 Eberstadt Germany Hirschmann Laborgeräte GmbH & CO. KG


www.hirschmannlab.com · info@hirschmannlab.com


HiClass in the lab – globally!


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