KERN PNJ 3000-2M Precision Balance, tuning fork measurement system, internal calibration, suitable for verification

The KERN PNJ 3000-2M precision balance represents a high-end metrological system solution for high-precision weighing applications in laboratories, industrial quality control and in legally regulated, calibration-required environments. Based on the innovative tuning-fork principle, this measuring instrument combines outstanding thermal stability with mechanical robustness and extremely short settling times. Wherever reliable mass measurements up to a maximum weighing range of 3,200 grams are required in a professional B2B environment, this laboratory balance guarantees gentle handling of materials, efficient operation and process reliability of the highest standard.

Innovative tuning fork measuring system and thermodynamic stability

The metrological foundation of the PNJ 3000-2M is its highly advanced tuning fork measurement system (Tuning Fork Technology). In direct comparison to conventional strain gauges or electromagnetic force-compensating load cells, this system operates using an oscillating quartz tuning fork. By coupling the change in mechanical frequency to the applied load, a transient, digital measurement value is generated, operating with virtually no wear. The system is characterised by excellent resistance to fluctuations in ambient temperature, achieves a remarkable settling time of just around 3 seconds, and saves valuable waiting time during sequential measurement series in the demanding day-to-day laboratory environment.

Automatic internal calibration for seamless GLP compliance

A key functional feature of the balance is the integrated, automatic internal adjustment (indicated by the ‘J’ in the model designation). The system continuously monitors the thermodynamic conditions and, upon detecting a temperature change or at predefined time intervals, initiates a fully automatic calibration using an internal calibration weight. Alternatively, this adjustment process can be triggered manually at any time at the touch of a button. For quality management personnel, this ensures seamless GLP/GMP compliance, as the balance independently safeguards its metrological chain and reliably eliminates measurement drifts.

Verifiable system architecture and ergonomic design

The PNJ 3000-2M has a type approval for verification in accordance with European accuracy class II. With a verification value of 0.1 gram and a readability of 0.01 gram, it meets all legal requirements for use in pharmacies (compounding balance), in the precious metals trade or for official analyses. The balance is fitted with a generous, square weighing pan made of stainless steel (190 x 190 mm), which allows for easy and residue-free cleaning. A large, high-contrast LCD display guides the user intuitively through the menu structure and, via an integrated capacity indicator (bar graph), constantly displays the remaining weighing range to prevent mechanical overload whilst protecting the equipment.

Technical details

Metrology & Weighing Specifications

• Weighing system: Innovative tuning fork principle
• Maximum weighing range (Max): 3200 g (3.2 kg)
• Readability (d): 0.01 g
• Verification value (e): 0.1 g
• Minimum load (Min): 0.5 g
• Reproducibility: 0.01 g
• Linearity: +/- 0.02 g
• Settling time / stabilisation time: approx. 3 seconds

Construction, materials & geometry

• Weighing plate material: Stainless steel
• Weighing plate dimensions (W x D): 190 x 190 mm (square)
• Housing material: Robust, impact-resistant plastic composite
• Overall dimensions (W x D x H): approx. 196 x 293 x 89 mm
• Net weight: approx. 3.5 kg

Functions, electronics & interfaces

• Calibration: Internal, fully automatic (time- and temperature-controlled)
• Verification approval: Verifiable to accuracy class II (verification optional ex works)
• Application modes: Piece counting, percentage determination, tolerance weighing (checkweighing), recipe mode
• Interfaces: RS-232 and USB interfaces for GLP-compliant connection to a PC or printer
• Display: Large LCD display with a digit height of 16.5 mm and capacity bar

Contents of delivery

• 1 x KERN PNJ 3000-2M precision balance base unit (MPN: PNJ 3000-2M)
• 1 x stainless steel weighing pan
• 1 x universal mains adaptor (Euro/UK/US)
• 1 x protective cover for the housing and keypad
• 1 x User manual

Important note for applications subject to legal metrology requirements: Initial calibration must be specified as an optional accessory at the time of the initial order. Subsequent calibration after delivery is not permitted by law.

Customised requirements & accessories

To optimally adapt the functionality of the KERN PNJ 3000-2M to your laboratory processes, we offer a comprehensive range of original accessories. For the direct, legally compliant printing of weighing data and calibration reports in accordance with GLP guidelines, we recommend connecting a KERN thermal or Nadelprinz statistical printer (e.g. YKB-01N). To protect against environmental influences at draughty workstations, our range includes bespoke safety hoods and under-counter weighing fixtures. For applications that are not strictly subject to verification, the balance can also be supplied with a traceable DAkkS calibration certificate. Please use our technical procurement service to configure your standards-compliant weighing station.