Accurate Laboratory Weighing with Automatic Internal Calibration

Reliable analytical balances for laboratories, research and quality control

KERN ADJ analytical balances are designed for precise weighing tasks in laboratories, research facilities, educational institutions and quality control environments. They combine reliable weighing technology with automatic internal calibration, straightforward operation and practical data communication options.

The ADJ series is a suitable choice for users who require consistently accurate weighing results without having to calibrate the balance manually with an external test weight before routine measurements.

Whether used for sample preparation, formulation, analytical work or quality assurance, KERN ADJ laboratory balances support efficient and reproducible weighing processes.

Key benefits of KERN ADJ analytical balances

KERN ADJ balances combine the essential functions required for professional analytical weighing:

• Automatic internal calibration
• Electromagnetic force compensation weighing system
• High-resolution weighing for demanding laboratory applications
• Glass draught shield with convenient access to the weighing chamber
• Level indicator and adjustable feet for accurate positioning
• Clear digital display
• Simple and intuitive operation
• RS-232 interface for connecting a computer, printer or other peripheral device
• Parts counting and percentage weighing functions
• Selectable weighing units
• Suitable for laboratory work, education and quality control

These features make the ADJ series a practical solution for both routine laboratory weighing and applications where stable, repeatable results are essential.

Automatic internal calibration for consistently accurate results

One of the main advantages of a KERN ADJ analytical balance is its automatic internal calibration system.

The balance uses an integrated calibration weight to check and adjust its weighing accuracy automatically. Depending on the operating conditions, calibration can be triggered by temperature changes or at defined time intervals.

This provides several practical benefits:

• No separate external calibration weight is required for routine adjustment
• The balance can react to changing environmental conditions
• Calibration is less dependent on the operator
• The risk of incorrect manual calibration is reduced
• Daily laboratory workflows become faster and more convenient

Automatic internal calibration is particularly useful when a balance is used regularly, installed in a location with changing temperatures or operated by several members of staff.

Precision weighing based on electromagnetic force compensation

KERN ADJ analytical balances use an electromagnetic force compensation weighing system. This measuring principle is designed for highly accurate weighing applications and supports stable measurement results when handling small sample quantities.

The weighing system makes the ADJ series suitable for applications in which reliable repeatability and fine weight resolution are required.

Typical tasks include:

• Preparation of laboratory samples
• Formulation and recipe weighing
• Chemical analysis
• Pharmaceutical laboratory work
• Research and development
• Material testing
• Educational experiments
• Production and incoming-goods quality control

The exact weighing capacity, readability and performance specifications depend on the selected ADJ model.

Glass draught shield for stable analytical weighing

Air movement can significantly affect sensitive weighing results. For this reason, KERN ADJ analytical balances are equipped with a glass draught shield.

The enclosed weighing chamber helps protect samples against:

• Draughts and air movement
• Air turbulence caused by people passing the balance
• Disturbances caused by ventilation or air-conditioning systems
• Minor environmental influences around the weighing pan

Multiple sliding doors provide convenient access to the weighing chamber. Samples, vessels and laboratory containers can therefore be positioned from different sides without unnecessarily exposing the weighing area.

The glass construction also allows the operator to observe the sample clearly during weighing.

Correct levelling for dependable weighing results

Precise analytical weighing requires the balance to be positioned correctly. KERN ADJ balances therefore include a level indicator and adjustable feet.

These features help the user level the balance accurately before operation. Correct levelling supports reliable measurements and helps avoid deviations caused by an uneven installation surface.

For best results, the balance should be installed on a stable weighing table or laboratory bench away from vibration, direct sunlight, strong temperature fluctuations and noticeable air movement.

Easy operation for routine laboratory workflows

The KERN ADJ series is designed for uncomplicated day-to-day use. A clearly structured display and direct function keys allow users to access the main weighing functions quickly.

Depending on the selected model and configuration, available functions may include:

• Standard weighing
• Taring
• Parts counting
• Percentage determination
• Unit conversion
• Data output

This makes the balances suitable for environments in which several operators need to perform accurate weighing tasks without complex menu navigation.

Parts counting and percentage weighing

In addition to standard weight determination, KERN ADJ analytical balances support useful application functions.

Parts counting

The parts counting function determines the number of similar items based on a reference quantity and the calculated average piece weight.

This can be useful for:

• Counting small laboratory components
• Checking quantities of lightweight parts
• Inventory-related control tasks
• Packaging and production checks

Percentage weighing

Percentage weighing displays the difference between a sample and a defined reference value as a percentage.

Typical applications include:

• Formulation checks
• Comparison of samples
• Determining deviations from a target value
• Quality control procedures
• Mixture and concentration-related weighing tasks

RS-232 interface for transferring weighing data

KERN ADJ analytical balances feature an RS-232 data interface for communication with compatible peripheral devices.

Depending on the laboratory setup, weighing results can be transferred to:

• A laboratory computer
• A compatible printer
• Data collection software
• Documentation systems
• Other suitable peripheral equipment

Digital data transfer helps reduce manual transcription and supports traceable weighing processes. It can also make it easier to document measurements for quality assurance, laboratory records or internal process controls.

The exact compatibility depends on the connected hardware, software and interface configuration.

Applications for KERN ADJ laboratory balances

KERN ADJ analytical balances can be used in a wide range of professional and educational environments.

Research and development

In research laboratories, accurate weighing is essential for preparing samples, comparing materials and conducting repeatable experiments.

Chemical laboratories

Analytical balances are commonly used for weighing substances, preparing solutions and measuring components for laboratory analyses.

Pharmaceutical and healthcare-related laboratories

Precise weighing supports formulation, sample preparation, testing and controlled laboratory procedures.

Quality control

Quality assurance teams can use analytical balances to check materials, components, samples and formulations against defined specifications.

Universities, colleges and schools

The straightforward operation of the ADJ series makes it suitable for practical laboratory training and educational weighing exercises.

Industrial laboratories

Industrial users can integrate KERN ADJ balances into development, inspection, incoming-goods control and production-related laboratory processes.

How to choose the right KERN ADJ analytical balance

When selecting a balance from the KERN ADJ range, several factors should be considered.

Maximum weighing capacity

The required capacity depends on the total weight of the sample, container and any accessories placed on the weighing pan.

Readability

Readability indicates the smallest weight increment shown by the balance. Applications involving very small quantities generally require a finer readability.

Minimum sample requirements

The smallest displayed increment is not automatically the same as the minimum suitable sample weight for a specific quality standard or regulated method. Users working under defined standards should determine the required minimum sample weight for their individual process.

Data communication

Where measurements must be printed, stored or processed digitally, the RS-232 interface and compatibility with the existing laboratory system should be considered.

Calibration requirements

Automatic internal calibration is particularly beneficial when regular adjustment, ease of use and reduced dependence on external calibration weights are priorities.

Installation environment

The balance should be placed on a stable, level and vibration-resistant surface. Environmental factors such as air movement, static electricity, humidity and temperature variation should also be considered.

Internal calibration and accredited calibration are not the same

Automatic internal calibration adjusts the measuring system of the balance using its built-in calibration weight. This supports accurate routine operation.

An accredited calibration service, however, documents the measurement performance of the balance under defined conditions and provides a traceable calibration certificate.

Depending on the application, quality management system or regulatory environment, users may require both:

• Regular internal adjustment for everyday weighing
• Periodic professional calibration for documented traceability

The appropriate calibration interval should be determined according to how frequently the balance is used, the required measurement accuracy, the operating environment and the applicable quality requirements.

Why choose a KERN ADJ analytical balance?

KERN ADJ balances offer a balanced combination of precision, convenience and functionality. Their automatic internal calibration system helps maintain weighing accuracy, while the draught shield, levelling features and force compensation technology support dependable analytical measurements.

Additional functions such as parts counting, percentage weighing and RS-232 data transfer make the series suitable for a broad range of laboratory and quality-control tasks.

For businesses, research organisations and educational institutions looking for a professional analytical balance with internal calibration, the KERN ADJ range provides a practical and efficient weighing solution.

Frequently asked questions about KERN ADJ analytical balances

What is a KERN ADJ analytical balance used for?

KERN ADJ analytical balances are designed for precise weighing tasks in laboratories, research facilities, educational institutions and quality control departments. Typical applications include sample preparation, formulation, analytical testing and material inspection.

What is automatic internal calibration?

Automatic internal calibration means that the balance adjusts its weighing system using a built-in calibration weight. The process can be initiated automatically in response to defined time intervals or changes in environmental temperature.

Is an external calibration weight required?

An external test weight is generally not required for routine internal adjustment because the calibration weight is integrated into the balance. External or accredited calibration may nevertheless be required for verification, traceability or quality management purposes.

Does the balance include a draught shield?

KERN ADJ analytical balances are equipped with a glass draught shield. It helps protect sensitive measurements from air movement and provides convenient access to the weighing chamber through sliding doors.

Can weighing data be transferred to a computer or printer?

The ADJ series includes an RS-232 interface that can be used to connect compatible computers, printers or other peripheral devices. The required cables, software and configuration depend on the intended system.

Can a KERN ADJ balance count parts?

Yes. The parts counting function can determine the quantity of similar items using a reference quantity and an average piece weight.

Can percentage weighing be performed?

Yes. Percentage determination can be used to compare a sample with a stored reference value or target weight.

Are all KERN ADJ models identical?

No. Models within the ADJ series can differ in maximum weighing capacity, readability, dimensions and other technical specifications. The product data for the selected model should always be checked before purchase.

Is a KERN ADJ balance suitable for regulated laboratory work?

Suitability depends on the specific method, applicable regulations, minimum sample weight, documentation requirements and calibration procedures. These requirements should be assessed individually before selecting a balance.