Buying Guide

How to Pick the Right Dispenser based on your Budget.

< $200                                  

Economy. Come with a narrow chemical compatibility range. For light applications, consider brands like BrandTech Seripettor and the Scilogex Dispensmate.

$200 to $500 Value for Money. Bottletop dispensers in this range offer a wider chemical compatibility range than the Economy dispensers as well as enhanced design features and material construction for heavier use. Some of the most popular brands in this category include the BrandTech Dispensette S, the Hirschmann Ceramus, and the LH Technologies Sapphire Dispenser.                                                                        
$500 to $1000 Premium. Most dispensers between 500 and 1000 offer the widest compatibility range and often support specialty chemicals and compounds. The models in this category that are popular are Dispensette S OrganicDispensette S Trace Analysis from BrandTech, Hirschmann Ceramus HF, and Brinkmann ChemSaver by Metrohm.                                                                                                                         
> $1000 Automation. For customers that are looking to automate their dispensing workflows through a programmable interface, consider the Opus from Hirschmann and the iFlow from Scilogex as they allow repeat dispensing for manufacturing facilities including perfume, essential oils, and other industries. These types of dispensers allow advanced programming.                                                    



Image: Hirschmann Bottle Top Dispenser

Bottletop dispensers are used in many labs for dispensing a wide range of reagents, media, chemicals, and solutions from bottles, containers, and drums into another smaller vessel. This method for transferring chemicals can be seen in academic research laboratories, wet chemistry laboratories, food and beverage quality control departments, biotechnology labs, the perfume industry, essential oils manufacturing, vapor shops, wineries, distilleries and more.

A few of the benefits of using a bottletop dispenser include the ability to dispense a liquid accurately and precisely in a safe way. Typical components of bottletop dispensers are the filling tube, piston (pump), discharge valve, and discharge tube. They are designed for one handed operation and fit common laboratory bottles such as 250 mL, 500 mL, 1 Liter, and 2.5 Liter glass bottles.

5 Criteria for Selecting the Right Bottletop Dispenser for Your Lab

  1. Chemical Compatibility
  2. Viscosity
  3. Volume
  4. Frequency
  5. Budget

Chemical Compatibility. Compatibility of a chemical with a dispenser can typically be grouped into four main categories. These include acids, bases, solvents, and highly corrosive liquids. Chemicals groups with examples are below

  • Acids: Acetic Acid, Hydrochloric Acid, Sulfuric Acid, Nitric Acid
  • Bases: Acetyl Chloride, Ammonia, Pyridine, Sodium Hydroxide
  • Organic Solvents: Toluene, Methanol, Trichlorotrifluoroethane, Dichloromethane
  • Highly Corrosive Liquids: Hydrofluoric Acid
  • Specialty Application: Essential Oils, Botanical Extracts, Grain Alcohol, Vegetable Glycerin

Viscosity. Highly viscous liquids and solutions with a kinematic viscosity of between 75 and 500 mm2/second will require careful selection of a bottletop dispenser whereas liquids below 75 mm2/second can be used with efficiency dispensers such as the BrandTech Seripettor and Seripettor Pro. If the desire is to dispense a liquid with the viscosity of vegetable oil or similar, consider the BrandTech Dispensette S, the BrandTech Dispensette S Organic, or the Hirschmann Ceramus. The design of these pumps allows them to withstand higher viscosity liquids. The key with all three will be the usage of the dispenser. With viscous liquids, take extra care to pump the dispenser slowly until you have a better feel for your application. If you have a questions about the compatibility of your liquid with a dispenser due to its viscosity, contact the Kite Scientific customer service team.

Volume. Bottletop dispensers come in both fixed volume and adjustable volume models. The most popular is adjustable volume. With an adjustable volume dispenser, the user must select a volume to dispense based on the volume range and volume increments supported. The volume dispensed by an adjustable volume dispenser can be set manually with an adjustment knob, manually with a dial, or electronically with a control panel depending on your model. The precision and accuracy range depend on the volume being dispensed.

Frequency of Dispensing. For those considering a dispenser for their production or manufacturing floor where there will be a high volume of dispensing being done, we recommend programmable dispensers including the Hirschmann Opus and the Scilogex iFlow. These types of dispensers allow the user to program for repetitive dispensing and can also come with even more accessories like a foot pedal for dispense timing control.


Important Design Features for Consideration during Purchase of Bottletop Dispensers

Recirculation Valve. Another variation seen in bottle top dispensers is the inclusion or exclusion of a recirculation valve. The recirculation valve on a bottletop dispenser is designed to recirculate the liquid as the user primes the dispenser for use. This feature recommended in most labs as it ensures the safe priming of the unit by preventing chemical splashing and offers cost savings as less liquid is lost.

Autoclavable. If autoclaving is a requirement for your protocol, manufacturing floor, or production, consider fully autoclavable dispensers like the Scilogex Dispensmate and BrandTech Dispensette. Make sure to read the manual prior to autoclaving as some most dispensers require loosening of valves prior to autoclaving.

Volume Setting Mechanism. Setting the volume on a bottletop dispenser is typically done through one of three designs: a volume adjustment knob, volume adjustment dial, and finally electronic with premium dispensers like the Hirschmann Opus.

Bottletop Dispenser Accessories

Bottle Adapters. Most dispensers will come with multiple sizes of thread adapters to ensure the dispenser itself can be used with the desired lab bottle. Typically, the adapters supplied with dispensers are made of polypropylene (PP), and can only be used for media which do not attack PP. If a higher chemical resistance is required, there are EFTE and PTFE bottle adapters available. Contact your Kite Scientific team with any questions.

Bottles. While some dispensers will come with a compatible bottle for the dispenser, most do not, as the material of the bottle needed will vary with the application and the chemical being dispensed. The most common bottles used are glass bottles that are 500 mL, 1 Liter, or 2.5 Liters in capacity. Before you purchase a bottle, ensure that the threads of the bottle will be compatible with your dispenser or if not, that a bottle adapter is available.