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Bottle-top Dispenser: Operating Principle and Applications
In many laboratories, efficient handling of liquids is crucial due to the volume of work involved. This saves time and ensures better results. Bottle-top dispensers assist in accurately measuring and dispensing liquids, which is practical when working with numerous reagents such as bases, acids, or solvents.
There are various types of bottle-top dispensers. They all share the feature of being screwed onto stock bottles, allowing the contained liquid to be dispensed using different methods. Digital dispensers operate similar to pipettes, where the user can dispense the desired volume by moving the plunger up or down. Analog dispensers are manually adjusted; the plunger is lifted to fill the cylinder with solution. There are also electronic dispensers equipped with displays. Another advantage of bottle-top dispensers is that they eliminate the need to adjust the meniscus.
There are two types of plungers: wiping and floating. For certain chemicals, a plunger with a seal is necessary to close the gap between the plunger and the dispensing cylinder. This creates friction, which may require higher operating forces. However, many devices feature spring support. The seal is a wear part. This design of bottle-top dispenser is suitable primarily for less aggressive and crystallizing reagents.
When working with critical substances, variants with a floating plunger are more suitable. This applies especially to handling these substances:
- Concentrated acids
- Organic solvents
- Bases
- Viscous media
The gap between the plunger and the cylinder is sealed by a liquid.
Bottle-top Dispenser: Added Value in the Laboratory
Bottle-top dispensers make serial dosing more efficient and safer. Users no longer need to handle laboratory bottles themselves, reducing potential mishaps. Some dispensers even automatically seal the dispensing nozzle when not in use, which is beneficial when dealing with aggressive media. Ensure the dispenser is suitable for the intended medium. If so, these devices are maintenance-friendly for liquid handling. They can usually be disassembled and are partially autoclavable at 121°C. Our blog covers many other topics related to liquid handling. For instance, like other volumetric measuring devices, dispensers need regular calibration for precise dosing.
BRAND Dispenser
Dispensette® S - the new generation bottle-top dispenser - the best Dispensette® ever
Improvements in almost every detail:
- Incredibly light fluid intake and delivery
- Easy venting through optimized flow channels
- Quick and secure volume fixation through internal rack teeth
- The right bottle-top dispenser for every application:
- Dispensette® S: Suitable for a wide range of applications, particularly effective for many acids, salt solutions, and organic solvents.
- Dispensette® S Organic: Ideal for application and dosing of organic solvents and concentrated acids.
- Dispensette® S Trace Analysis: Designed for use with high-purity acids, bases, and H2O2. With a platinum-iridium valve spring, it can also be used as a hydrofluoric acid dispenser.
The Dispensette® S, three variants for optimal use:
- Digital: Particularly clear digital display. The selected dispensing volume is precisely and reproducibly adjustable. Easy Calibration Technique for tool-free adjustment in seconds. Automatic marking when changing factory settings.
- Analog: Analog volume display, quickly adjustable dispensing volume, securely fixed by internal rack teeth. Easy adjustment with adjustment key.
- Fixed: Pre-set dispensing volume for standard applications. Easy adjustment with adjustment key.
Hirschmann Dispenser
Hirschmann dispensers are available in various volumes, e.g., 10 ml, 20 ml, and 50 ml. These dispensers combine efficiency, functionality, and user-friendliness.
The electronic control allows for consistent and reliable serial dosing. Additionally, a method memory for nine different dosing operations with storage of all settings is integrated.
Bottle-top Dispenser: Dosing with Highest Reliability
VITLAB bottle-top dispensers offer a wide range of applications for precise dosing. VITLAB® genius2 and simplex2 are almost universally applicable, while the VITLAB® TA2 dispenser was specifically developed for trace analysis and highly concentrated media. Chemical-resistant materials make VITLAB bottle-top dispensers highly robust and reliable. They can be screwed directly onto all common laboratory bottles or with the help of an adapter, eliminating the need to transfer chemicals.