Laboratory balances are measuring devices to determine the weight of a specimen. Let’s find out what is an experimental balance through the following article

1. What is a laboratory balance?

Laboratory balances are known to be devices and instruments with measurement functions to determine the weight of a specimen. The most commonly used balances in laboratories, research laboratories,…

2. Advantages and uses of laboratory scales

With more outstanding features than other scales, laboratory scales have a number of advantages that can be mentioned as follows:

Designed with compact size, diverse designs.

Measurement results are quick, displayed on the screen and have very accurate parameters.

The scale is also solidly designed, easy to clean, hygienic, uninterrupted operation.

Laboratory balance with software to install, save parameters and can store results.

Laboratory balance is a type of microbalance, so it is mainly used for weighing small, high-resolution and accurate samples. high accuracy, with great value, very suitable for use in laboratories, jewelry trade, industry and research institutes,… 

Designed with precision and modernity for quick on-screen results. It can also be used as a tube so that data can be transferred to a PC for easy analysis, piece counting and hopper functionality.

3. Structure, working principle

Laboratory balance is designed similarly to other scales such as electronic bench scales, electronic scales. Laboratory balance is designed with compact design, easy to use. Below is the structure of the commonly used laboratory balance:

Outer layer of the scale: this part is responsible for protecting the internal components of the scale. At the same time, the transparent windshield box of the scale is designed to protect the specimen from the wind and avoid affecting the results for accurate measurement results.

Loadcell: sensor block known as a sensor placed underneath the weighing pan to help receive signals from the weight weight of the object placed above. Then, the sensor block will convert the variable signal to convert it into an electrical signal at the output. These electrical signals are converted into amplification blocks so that data analysis can be performed.

Signal amplifier or ADC converter circuit: signal amplification is a part responsible for amplifying the signal with a guaranteed magnitude. are matched to analog and digital variability. The analog converter is sized and sized to match the incoming amplifier circuit. Then, where the signal is output, it is a digital signal to put into the central processing block. The ADC converter circuit is known as a comparator circuit, which converts the voltage and has a reference equal to the analog voltage. Then, this ADC converter circuit will generate a code with a value corresponding to the voltage.

Central processing block: is the central part of digital signal processing and signal processing from ADC, this part is responsible for processing signal to be passed to the program in the central unit. This processor also has memory to help store data, adjust zero and have the ability to subtract tare, etc.

Display: display with laboratory balance as the receiver of the output signal. From there, the user can read the results of the weight of the object to be weighed. Through the wall, all kinds of laboratory scales use LCD screens and LED screens. The buttons are designed so that suitable measurement modes can be set  with the central and external processors. Currently, laboratory scales have buttons such as CALL, ON/OFF, PRINT.

Power supply: laboratory scales are using a direct power source and using an AC to mains power converter DC power such as 5V or 12V power supplies,…
In general, the working principle of a laboratory balance is similar to that of other electronic balances and has a simple operating principle as follows:

When a specimen is placed on top of the pan, the weight of the specimen is pressed against the weight sensor and converts the signal into an electrical signal to from there to the signal amplifier. This electrical signal will then be converted into numbers for the final display.

At that time, users only need to read the displayed data results to read the data and conduct accurate measurement results analysis. . From there, users can analyze samples as well as assess the quality of each specimen suitable for the job.

4. Popular types of laboratory balance

Coarse scales: are scales that provide results obtained with accuracy in grams.

Technical balances: are all commonly used scales in measurements that do not require high accuracy, usually ranging from 0.001 – 0.1g. This is the type of balance used when you want to pre-weigh the sample before analysis.

Analytical balance brings high accuracy, capable of analyzing samples and stock substances used for solution preparation with the highest accuracy. . In the line of analytical balances, there are also different types of laboratory balances:

Analytical balances usually provide results with an accuracy of 0.1mg – 200g.

Semi-micro balance is a high-precision scale, from 0.01 – 0.02g (10-3mg)

Dynamic microbalance accurate to 0.001 mg.

Ultra-microbalance with an accuracy of 106 – 109

In the above balance lines, the semi-micro balances, micro-balances, micro-micro balances are all high-end, high-priced weighing scales. very high. Therefore, they are all commonly used scales in many specialized laboratories.

In addition, laboratory scales are classified according to each degree of accuracy of error. You can refer to a number of accurate electronic scales that are commonly used today:

Analysis of 2 odd numbers.

Analysis of 3 odd numbers.

Analysis of 4 odd numbers.

Analysis of 4 odd numbers  

Analysis of 5 odd numbers.

Analysis of 6 odd numbers.

Moisture scale

5. User manual for laboratory balance

Start weighing

Before weighing, you should take steps to warm up the scale to ensure stable operation of the scale.

Power on the scale to start up, warm up the scale, adjust the scale to temperature and humidity.

Connect to computer, printer or monitor before weighing.

Fix the scale position and won’t move after starting the warm-up.

If an error is suspected on the scale, it is best to calibrate it before weighing.

Makes the room air humidity from 45%-60%, does not change the humidity so as not to change the weighing results.

How to use laboratory balance

Step 1: The scale has been powered on and started, place the pan on the scale with gloved hands.

Step 2: Click the Zero button to return the scale to its default state.
Step 3: You use clamps and gloves to place the specimen on the weighing pan gently and avoid the specimen falling out.

Step 4: Results are displayed on the screen, write the results. You can press the “Hold” button to keep the data.

Step 5: You continue to click the “Zero” button to return the screen to default and proceed to measure other specimens.

Step 6: Once done, take out the specimen and the weighing pan.

Step 7: Turn off the machine, turn off the power and clean the weighing surface and surrounding area.

6. Laboratory weighing application

Laboratory balance, also known as analytical balance, technical balance, this type of balance is commonly used in many other research fields. together, users can refer to some of the following applications:

In the field of industrial production: laboratory scales are used in industrial production that requires high accuracy requirements. . This type of balance is capable of weighing samples accurately and is also used in the production of pharmaceuticals, foodstuffs, biochemistry, petrochemicals, etc. This scale is also commonly used in business fields such as: weighing gold, weighing silver and weighing precious stones such as diamonds,…

In the laboratory: special laboratory balances are very popular, they are known as laboratory balances used currently in the field of research. Laboratory balances are used to weigh samples accurately, thereby serving researchers to meet the research work of new products and new materials.