Meters, as the etymology of the word itself states, measure a certain determined quantity of a substance, mostly liquid. The concept is that from a larger container a quantity of liquid is extracted that the meter is able to measure.
Meters from different sectors
It is good to specify that these are laboratory dispensers, because dispensing is a process that is present in many environments and with different characteristics. For example, dispensing is present in the kitchen with its own instruments such as bottles or jugs that are also present in the laboratory. In the industrial sector, there are dispensers for air, for fluids, for packaging, piece counters and much more.
In the chemistry, biology or analytical laboratory, dosing is mainly done in two ways: drawing liquid from a bottle; turning the bottle to fill a specially shaped cap.
The first type of dispensers are called repetitive dispensers because they are able to take the same amount of liquid many times in succession. Even if the operation is repeated frequently, the same precise quantity is maintained. There is always a certain margin of error tolerance, but it is very minimal. Drawing is done via a piston that can be adjusted for different capacities. This allows this type of dispenser to set the quantity by turning a ring nut on the piston body and adapt it to different requirements.
How to choose a dispenser
When buying a dispenser, several factors must be taken into account. First and foremost, the precision of the withdrawal. The greater the precision, the higher the price of the product and the accuracy with which it is constructed. You do not always need to spend a lot of money on dispensing that requires less precision. There are good products on the market with average performance that are useful in most machining operations.
The material of construction can be decisive if you need to draw corrosive or acidic liquids. In this case, the dispenser body must be made of PTFE in order not to be damaged and not to interfere with the analysis. Very important is the possibility of attaching this plunger to the most common bottles of the substance to be withdrawn.
The plunger must be made of PTFE in order not to be damaged and not to interfere with the analysis.
In many cases it is necessary to take quantities of solvent or chemical reagent. To avoid having to decant the liquid, with the risk of contaminating the operator, it is preferable to be able to place the dispenser on the bottle of the product itself. There are various bottle and container sizes on the market. It is therefore important to ensure that the dispenser to be purchased is equipped with adaptors so that it can be attached to different types of bottles.
All those dispensers that have a container on the cap can be defined as manual. This is filled by tipping the bottle or, in the case of plastic bottles, by pressing on the body to release the liquid. These are obviously less precise than repetitive dosing, but occasionally they do offer their service. Glass dispensers can be made by our Colaver glassblower in the desired size. The containment bubble can be larger or smaller and therefore have different capacities. In our catalogue you can see other types of dispensers for different requirements.