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Dispensing

with bottle-top dispensers

Definition of 'dispensing':

The term 'dispensing' is understood to mean the discharge of defined quantities. For easy, rapid and precise dispensing of reagents, bottle-top dispensers are widely employed to replace poured transfers into graduated cylinders. They can be mounted directly on commercial laboratory bottles, either directly or by means of adapters. It is no longer necessary to transfer or decant chemicals. Serial dispensing in particular is greatly facilitated.

Functional principle of bottle-top dispensers

By an upward movement of the piston, the preset amount of liquid is aspirated from the reagent bottle into the dispenser cylinder. By the subsequent downward movement of the piston, the liquid is released through a valve system and the discharge tube. There is no need to set a meniscus or to observe a waiting time.

Dispensing

Bottle-top dispensers with floating pistons, e.g., Dispensette® from BRAND

Dispensette S

For dispensing aggressive reagents, e.g., concentrated acids such as H3PO4, H2SO4, bases like NaOH, KOH, saline solutions, as well as many organic solvents: Dispensette® S

Dispensette Organic

For dispensing organic solvents, such as chlorinated and fluorinated hydrocarbons (e.g., trichlorotrifluoroethane and dichloromethane), or acids such as concentrated HCl and HNO3, as well as for trifluoroacetic acid (TFA), tetrahydrofuran (THF) and peroxides: Dispensette® S Organic

Dispensette S TA

For dispensing HF we recommend the use of the Dispensette® S Trace Analysis with a platinum-iridium valve spring.

Dispensette® S, Digital, DE-M, 1-10ml, with recirculation valve

The Dispensette® S is your number 1 solution for direct bottle-top dispensing. It makes dispensing liquids safer and easier. Thanks to the special functional design of the piston, the…

Dispensette® S, Analog-adj., DE-M, 0,1-1ml, without recirculation valve

The Dispensette® S is your number 1 solution for direct bottle-top…

Dispensette® S Organic, Digital, DE-M, 1-10ml, with recircul. valve

The Dispensette® S is your number 1 solution for direct bottle-top…

Dispensette® S Trace Analysis, DE-M, PT/IR, 1-10 ml, w. recirculation valve

The Dispensette® S Trace Analysis provides outstanding performance…

Documents download

Dispensette® S

Operating Manual | pdf | 2 MB

Dispensette® S

Brochure | pdf | 2 MB

Volumetric Measurement

Brochure | pdf | 4 MB

Dispensette®

Testing instructions (SOP) | pdf | 415 KB

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Bottle-top dispensers with wiping-seal piston, e.g., seripettor® from BRAND

Seripettor

The design of the system allows a replacement of the complete dispensing cartridge. The somewhat higher operating forces during filling are minimized by a spring with automatic lifting action. The seripettor® pro is a competitively-priced dispenser for simple dispensing tasks in the volume range of 0.2 to 25 ml.

 

Range of application and materials

The range of application includes the daily routine dispensing of bases, acids in low concentration, biological buffers, cell culture media, biological detergents and polar solvents. The seripettor® pro dispenser is suitable for dispensing acids such as concentrated HCl, polar solvents (e.g., acetone) and UV-sensitive media. In contrast to the seripettor® dispenser, valves made from chemically resistant materials are used in this instrument.

seripettor®, 1-10 ml

seripettor® and seripettor® pro are innovative bottle-top dispensers from BRAND with a special design. A lifting spring provides automatic filling. When the piston seal is worn out, the entire dispensing unit can be exchanged by…

seripettor® pro, 0,2-2 ml

seripettor® and seripettor® pro are innovative bottle-top dispensers from BRAND with a special design. A lifting…

Documents download

seripettor®

Operating Manual | pdf | 2 MB

seripettor® pro

Brochure | pdf | 1 MB

Volumetric Measurement

Brochure | pdf | 4 MB

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Safety always comes first!

When choosing a bottle-top dispenser, the safety features of the instrument should be kept in mind. For example, does it reduce the risk of injury due to glass breakage? How does it avoid accidental splashing when the instrument is primed? How is contact with the medium minimized when the dispensing tube is closed? Likewise, the suitability of the dispenser for the medium to be dispensed should be checked by the user. Information about this can generally be found in the operating manual in the chapter 'Function and limitations of use'. When in doubt, contact the manufacturer directly. Information on maintenance and monitoring of measuring instruments are also found in the operating manual.

Calibration

Monitoring of measuring instruments / calibration

In regard to the monitoring of measuring instruments according to ISO and GLP  guidelines, the accuracy of volumetric instruments should be checked regularly and recalibrated if necessary.