How To Select A Bottle Top Dispenser Correctly

What Is A Bottle Top Dispenser?

Bottle top dispenser is a common laboratory instrument used to dispense precise amounts of chemicals/reagents, organic & inorganic solvents, oils, other liquids, etc. from bottles or other containers. 

Bottle top dispensers are, as the name suggests, on the top of a bottle instead of its cap. It is an essential instrument for accurate and precise liquid measurements in the laboratory to maintain the integrity of the experiment. Without bottle dispensers the risk of chemical spillage, inaccurate measurements and fatal laboratory accidents increases considerably. 

Bottle top dispensers can facilitate a broad range of applications and increase safety, reliability and speed at daily laboratory operations. Choosing a correct bottle top dispenser saves time, work and protects your samples as well. 

It is vital to identify the need of liquid dispensing first, before choosing the correct bottle top dispenser for the laboratory. Each and every bottle top dispenser comes with different kinds of limitations such as volume, chemical compatibility, frequency of use, viscosity etc.

Below is a thorough description of three main points to consider on how to select the correct bottle top dispenser. 

The capacity of the dispenser

Bottle top dispensers come in both fixed and variable volume range models, every range has maximum and minimum liquid handling capacities as per the model. The volume can either be changed manually with the help of its knob or a dial or electronically through the control panel. 

Chemical compatibility

While selecting a bottle top dispenser, the user must check the chemical compatibility of the dispenser. A chemically compatible dispenser delivers explicit results and also enables easy maintenance. Every dispenser has a defined chemical compatibility that ensures that the liquid being dispensed does not strike the materials of the dispenser and affect its functionality permanently. 

Generally, the compatibility of the dispenser with a chemical can be grouped into four main categories. These include acids, bases, solvents and highly corrosive liquids. 

For example, strong chemicals like Hydrofluoric Acid cannot be dispensed using a normal dispenser, owing to their corrosive properties. 

Viscosity of the reagent

The viscosity of the reagent is another important point that a user must consider before choosing a Bottle Top Dispenser. Highly viscous solutions with a kinematic viscosity between 75 and 500mm2/ second will require correct selection of bottle top dispenser. Solutions below 75mm2/ second can be used with efficiency dispensers. Microlit bottle top dispensers of liquid having viscosities up to 500cp. 

After selecting the correct bottle top dispenser, it is essential to learn how to set up the bottle top dispenser properly to ensure the accurate and precise results. 

  • Before starting the dispensing, the user should verify the calibration of the equipment. It is wise to cross-check the calibration report provided in the box to ensure that the dispenser is calibrated according to the ISO 8655 standards and that the calibration has not expired. 
  • Choosing the right bottle adapter that helps in mounting the dispenser on the reservoir bottle. The provided adapters are made with polypropylene and work for most applications. ETFE/PTFE adapters may be used for corrosive acids.
  • The next step is to attach the inlet tube with provided extension tubing to reach the bottom of the reservoir bottle that is being used. 
  • After connecting the inlet tube to the dispenser, mount it on the solvent bottle and tightly screw it up. 
  • To ensure that the barrel of the bottle is bubble-free, purge the dispenser by continuously filling-dispensing operations multiple times until there are no bubbles remaining. This process has to be carried out when the recirculation knob is in a closed position so that there is no reagent or chemical wasted during the on-going process. 
  • Once the bottle top dispenser is properly removed, next is to set the desired volume on the scale using the volume adjustment knob. 
  • The dispenser is now set to dispense the required chemical in a controlled motion to achieve an accurate and precise amount from the dispenser

There are many advantages of the Accumax bottle top dispenser such as unique piston mechanism, springless valve design, volume lock, dual graduation marks, 4 additional adapters, ISO 8655-5 standards, easy to dismantle

Accumax Bottle Top Dispenser has various innovative design features as well to make it perfectly precise to use:

  • Versatile telescoping filling tube, compatible with a bottle height range of 170mm to 30mm.
  • Discharge tube with 360 degree rotation for convenient dispensing in multiple vessels. 
  • Single tool calibration
  • Ergonomic design for convenient sampling and low pressure design for larger volumes.
  • Snap-fit mounting of discharge tue for easy handling.
  • Safety-looking feature for prevention against accidental spillage.  


Generally, bottle top dispensers have a good deal of  benefits, although some of other core benefits are as follows:

Accuracy and precision

The bottle top dispensers enhance the accuracy and precision of your daily laboratory work. They are known to offer 0.5%-0.6% accuracy. 

Time saved

One of the best advantages is that the bottle top dispenser intensifies productivity by increasing the pace of work. Traditionally, it takes hours to prepare multiple samples of the same quantity by pouring it manually from the source container to the receiver. Bottle top dispensers allow the user to prepare samples in a short period of time. 

Easy to use

Bottle top dispensers are known for their ease of use and safety. They provide a closed, ideal environment for the reagents, preventing accidental spilling and reducing the risk of exposing the lab users to hazardous chemicals. 

No wastage of chemicals

Since the bottle top dispensers are designed ergonomically, they prevent wastage and accidental chemical spilling. They are equipped with a recirculation valve which prevents the loss of reagents during purging by redirecting them into the mounted bottle and facilitating bubble-free dispensing. If the recirculation valve is closed and the piston is pressed down accidentally, the reagent will go back into the bottle rather than spilling out. 

Contact us to experience our bottle top dispenser which offers unmated features and satisfaction made from the best quality raw materials for unwavering precision and durability that spans over years by Accumax

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