Advice on how to choose a balance for the laboratory.
Laboratory scales are devices that measure the mass of substances or objects with an accuracy of 0.0001 g. These high-precision accessories are used throughout industry and scientific research.
“The main work carried out in the laboratories is aimed at tracking the primary processing of raw materials and manufacturing various products. Therefore, modern scales must be automated and technically equipped,” Venta Lab says https://ventalab.ua/ru/.
The quality and proper selection of laboratory equipment largely determines the effectiveness, accuracy and efficiency of the research, and also, to a certain extent, affects the work of employees.
Criteria for choosing a laboratory balance
Today, only high-precision electronic devices are used in laboratories. Such scales are not limited to simple weighing, they have a bunch of additional functions, for example, data collection, storage and processing; conversion to percentages and different units of measurement; density calculation and more.
All laboratory scales differ in the technical and functional features specified in the instrument data sheet. Depending on the needs of a particular laboratory, a model that meets the requirements is selected.
Among the main criteria to pay attention to:
- division price;
- possible error;
- range of weighing limits;
- precision class;
- helper functions
Price division
A mass measurement equal to the difference between the values of two successive scale marks.
Possible error
The maximum permissible error of the scales or the "price of the verification interval". The maximum permissible error should not exceed the normative documents. It is indicated by the manufacturer during the production of scales.
The ratio of discreteness and separation price is considered ideal if they are equal.
Weight range
There are two main indicators: NGV, which indicates the upper limit mark of the load, and NmGV, which corresponds to the lower limit. If calculations go beyond these allowed values, the result will be invalid.
Accuracy classes
Class membership defines government or industry standards. This factor is influenced by NGV and the division price. In total, 4 classes are distinguished by number:
- Class 1 - special;
- Class 2 - high-precision;
- Class 3 - medium accuracy;
- Class 4 is normal.
Additional Functions
Several modes of operation: weighting, taring, counting several weighings.
Authorized software. This feature allows multiple users to work with personal data. Everyone can set a password to protect information.
Interfaces for exchanging digital values with a computer. This simplifies the process of transferring calculations and accounting for data.
