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Definition: What is an analytical balance?

The analytical balance works with an extremely high precision at a resolution of 0.1 to 0.01 mg. Whether in pharmacies, in laboratories, in medicine or even in schools and universities - such a laboratory balance is indispensable in many areas for high-quality analyses. Modern analytical balances work according to the principle of electromagnetic force compensation: a torque is generated by the dead weight of the material to be measured. The corresponding counter-torque is triggered with the aid of electricity. In most cases, an electromagnetic system is used for this purpose - usually in the form of a coil in a permanent magnet. Any change in the coil current can be measured specifically and can be represented by the analytical balance as a weight value.

Difference between precision balances and microbalances

The analytical balance is a highly sensitive laboratory balance and is characterized by the extreme precision of the measurements. The resolution is usually 0.1 mg, so it is possible to weigh out even very small amounts of substance. The microbalance allows even more accurate weighing. The minimum sample weight for analytical balances (d=0.0001) is 10 and 15 mg. In this regard, it should be noted that according to current guidelines, one hundred times the standard deviation is permitted.

For comparison: microbalances are capable of determining values in a range of up to 1 µg. A single hair with a length of ten centimeters weighs about 50 to 100 µg. This can only be determined with a microbalance.

Common functions of modern analytical scales

Find on MedSolut.com the analytical balance that perfectly fits the needs of your institute, company or medical or educational institution. The main functions of the analytical balance:

• With a laboratory or analytical balance, you can accurately weigh small quantities of materials.

• Depending on the model, different weighing ranges are available.

• Moreover, the functionality in terms of individual readabilities speaks for the value of analytical balances.

• Modern scales are designed for weighing capacities of 1 to 200 g and readabilities of 0.1 mg to 0.01 mg. More sensitive balances can be found on Medsolut.com under the category of microbalances.

• Integrated data and method storage via USB or RS232 connectivity is often provided.

• A draft shield to protect the weighing pan from temperature fluctuations and air movements is also usually part of the equipment.

• You will also find analytical balances with alignment, overload and underload indicators.

Areas of application for analytical balances

Analytical balances are an essential work tool in pharmacies, scientific institutes and facilities as well as in chemical and biological areas, but also in the physics industry. They can be used to precisely weigh chemicals and other substances as well as samples and more. In addition, dynamic weighing of liquids, insects and other unstable samples is possible with modern analytical balances. In addition, an analytical balance can be used to count parts, tablets or other components and determine the density of substances and materials.

The correct use of analytical balances

In order to use an analytical balance correctly, a few things must be observed so as not to put unnecessary strain on the sensitive equipment. To begin with, for example, the warm-up time of the balance (mostly 30 min) should be observed. In addition, keep the ambient temperature constant and adjust the temperature of the materials to be weighed to the room temperature so that no condensation occurs that could falsify the results. Place the sample to be weighed as accurately as possible in the center and watch out for residues on the weighing vessel. Wearing gloves can make the weighing process easier in this respect. Also use the draft shield to screen out air movement and make sure that no electrical interference fields come close to the scale. If you follow these measures, your measurement results should be highly accurate. Regular calibration is also beneficial.

Calibration and verification of the analytical balance

Calibration and verification are carried out using various weights, with the aid of which the balance is checked for its measurement tolerance . Calibration is carried out by the user or a competent body, while verification must be carried out by an official inspection. During calibration, the user must ensure that the values when weighed are within a specified range , i.e. the measurement accuracy must be exact. Calibration is performed according to specifications of certain standards or recognized authorities (Weights and Measures Office). If necessary, devices with faulty measurement can be readjusted. Calibration involves checking for certain criteria. For example, the analytical balance must not be capable of being tampered with and must also meet certain other requirements. There must also be special information on the nameplate (e.g. CE marking). Calibration is usually performed every 2 years.

Laboratory analytical balance: selection criteria

Depending on the measurement project, project and scale, you can choose between different analytical balances. We will be happy to show you the most important attributes that a laboratory analytical balance should have in your company or institute. Let our competence team advise you professionally. The most important criteria of modern analytical balances for the laboratory:

Weighing range

Depending on the areas in which the analytical balance is to be used, you will find various models with corresponding weighing ranges on MedSolut.com. High-performance laboratory balances are characterized by weighing capacities from 1 to 200 g.

Readability

Depending on the respective weighing applications in your company, you will find analytical balances with readabilities from 0.1 mg to 0.01 mg in our online catalog. So-called micro-analytical balances are characterized by the fact that they can be used for weighing considerably smaller quantities - from as little as about 0.1 mg upwards.

Weighing surface

Depending on the substances and materials to be weighed, the appropriate container must of course be in use. In laboratories working with small quantities, a small weighing platform is generally sufficient. However, the container used for weighing should not be larger than the weighing platform. Therefore, in case of doubt, a larger weighing platform should be selected. For exceptional cases where a larger surface is not available, care should be taken to ensure that the weight of the materials to be weighed is evenly distributed for accurate measurement results nevertheless.

Accuracy and resolution

Precise measurements are elementary in medical, pharmaceutical, biological or chemical fields. Therefore, opt for this type of scales with a high accuracy. Models with electromagnetic force compensation shine with their very high resolutions and can achieve weighing accuracies of +/- 0.1 mg, among others. Some devices also have an internal automatic calibration function.

Operating temperature

A balance can only work with the highest accuracy at a certain temperature. Pay attention to how long the balance needs to reach this temperature. Usually this is about 30 minutes, but it can be longer. If you don't want to put up with extra time, it makes sense to go for a scale that reaches the operating temperature quickly

Repeatability

Due to external influences, it is sometimes necessary to perform measurements several times in succession. The high-quality laboratory balances impress with their special repeat accuracy, so that you can always generate precise measurement results. If you have any questions in this regard, we will be happy to help you.

Interfaces and software

Today, many laboratories work with a PC in order to further use the results. In such a case, it makes sense to choose an analytical balance with an interface that makes it easy to transfer data to the PC or to a label printer. Here there are interfaces for direct transmission or also storage media connections such as USB. What is also common in analytical scales is the RS 232 interface, which is ideal for use with printers and scanners. In addition to interfaces, the right software is also essential for fast and unobstructed work in the laboratory. For example, good software not only offers direct transmission of results, but also automatic listing of times, results and evaluations.

Type of wind protection

Drafts or movements in the ambient air can lead to inaccuracies in the measurements to be made. To prevent this, the first-class laboratory balances on MedSolut are equipped with special draft shields. Depending on the model, these are made of robust glass or plastic. The corresponding segments can be opened both mechanically and electrically.

Accessories

Since many factors can affect the measurements, there are accordingly many accessories to eliminate these factors. These include, for example, the windshield described above or protection against static influences caused by other devices placed near the balance. Even minor vibrations interfere with the measurement, so anti-vibration tables are also available to absorb disturbances. Weighing paper, certain spatulas or weights are also often used in the weighing process for calibration.

Special settings

Additional fine adjustments are practical for individual use. For example, there are analytical scales that are equipped with additional percentage, check or recipe weighing or that also help with piece counting. Also helpful are variable limit values or software for calculating statistics. Other weighing options include:

• Underfloor weighing (for items that do not fit on the weighing pan due to their size or shape).

• Animal weighing (e.g.: in poultry fattening)

• Moisture analysis

Depending on the laboratory area and analyses, the requirements for analytical balances differ. Consider which functions they support in your daily laboratory routine and pay attention to these functions when purchasing. You will then be satisfied for a long time with the high-quality analytical balances from MedSolut.

Frequently asked questions about calibration and adjustment of analytical balances

Accurate calibration, verification, calibration and adjustment of measuring instruments is the basis for generating accurate measurement results. Find out everything you need to know about the perfect functionality of your legal-for-trade analytical balance at MedSolut.com. The following questions and answers can also help you specifically in your search for the optimal product:

What is meant by "accuracy" of an analytical balance - and how can it be determined?

The weight of any balance is independent of its location. However, due to possible changes in temperature and ambient air, the measured values may vary. To prevent this, the exact setting of the analytical balance must be done individually and on site. The value of the deviation should not exceed +/- 1 mg.

Why do analytical balances need to be calibrated?

Over the course of use, the accuracy of an analytical balance may deteriorate. This is due to material wear, but also to external influences. Inaccurate readings can lead to high costs and incorrect formulations in a wide variety of applications. Regular checking is therefore essential.

How can analytical balances be calibrated?

Calibration is performed by an approved or certified service technician on the basis of a standardized procedure and with the aid of calibration software. We will be happy to show you the detailed procedure.

What tolerances apply to the calibration of analytical balances?

A distinction is made between legal tolerances, manufacturer tolerances and process tolerances. The former are defined by OIML R76 and determine the legal-for-trade conditions. In general, tolerances are an indication of the "good" or "bad" weighing precision of a balance.

Assortment of MedSolut.com - top manufacturer of analytical balances

In our wide range of products you will find a variety of analytical balances from well-known manufacturers. Let the great variety on our platform convince you. We will be glad to help you in your search for the optimal analytical balance.

Kern

The Kern company is one of the leading manufacturers of high-precision analytical balances for laboratories and industry. The entire range of this manufacturer shines due to its excellent quality. Especially popular are models such as the KERN AET, KERN ACS or the KERN ABJ-NM.

Phoenix Instrument

The manufacturer Phoenix has already been highly successful on the market for many years and offers a comprehensive product portfolio with a view to scales and laboratory supplies. Discover on MedSolut.com the best solutions from Phoenix for your company.

Shimadzu

As an internationally active manufacturer of first-class scales and laboratory supplies, the Shimadzu company established itself on the market years ago. We hold the best analytical balances and more from Shimadzu in our assortment for you. Popular models include the SHIMADZU AX, AW or AUY.

Buy analytical balances - our experts will be happy to advise you!

Find calibratable analytical balances for your laboratory or pharmacy now on MedSolut.com. Our highly motivated team of specialists will be happy to assist you - you can reach us by phone at +49 30 209657900 or by e-mail at info@medsolut.com. We look forward to meeting you.