KERN ADJ 200-4 analytical balance, self-calibrating, 220 g / 0.1 mg

The best-value balance with uncompromising precision: KERN ADJ 200-4 analytical balance

Weighing in the sub-milligram range is a daily, yet error-prone, challenge for any analytical laboratory. A brief draught when opening the door, the morning sun beginning to shine onto the laboratory bench, or the air conditioning switching on – these factors can alter environmental conditions so significantly that high-precision measurement results may be compromised. Standard basic balances would then have to be laboriously recalibrated and adjusted manually using expensive, external test weights. With the KERN ADJ 200-4 analytical balance (MPN ADJ 200-4), this time-consuming problem is finally a thing of the past. This model is the undisputed best value for money in the range of analytical balances, offering users the luxury and standard-compliant functionality of fully automatic, internal adjustment. You get absolute top-class precision with a readability of 0.1 mg (equivalent to 0.0001 g) across an impressive maximum weighing range of 220 g.

Reliability thanks to intelligent automatic calibration

The greatest technical and economic advantage of the KERN ADJ 200-4 is its motor-driven calibration weight, which is discreetly integrated into the housing. The balance’s electronics continuously monitor its immediate surroundings. As soon as the sensors detect a temperature change of ≥ 2 °C, the instrument initiates a calibration process completely independently and fully automatically. But that’s not all: even if the temperature in a highly climate-controlled laboratory remains absolutely constant, the instrument calibrates itself precisely every 3 hours on a timed basis for its own safety.

For you as a user, this offers three key benefits:

• Location independence: You can use the balance in different locations within the laboratory or move it around flexibly without having to call on the testing equipment officer for recalibration every time.
• GLP/ISO compliance: Your measurements are guaranteed to be error-free throughout the entire working day and can be documented without hesitation for rigorous audits.
• Significant time savings: The morning routine of manually warming up, balancing and adjusting the balance using tweezers and test weights is completely eliminated.

Wide weighing range meets extreme resolution

With a capacity of 220 g, the balance stands out from smaller entry-level models. This high capacity is particularly crucial in day-to-day use when you are using heavy tare vessels – such as thick-walled Erlenmeyer flasks, bulky measuring cylinders or large beakers – yet still need to weigh tiny sample quantities in the range of tenths of a milligram with precision into these vessels. The balance responds in a flash and, thanks to its advanced force compensation technology, typically delivers an absolutely stable weight reading within just 3 seconds. This greatly speeds up routine tasks such as the calibration of micropipettes, the precise preparation of standard solutions for HPLC, or the formulation of gravimetric mixtures.

Ergonomics and protection through thoughtful design

A reading of 0.0001 g is extremely sensitive to even the slightest air currents. The KERN ADJ 200-4 is therefore fitted as standard with a spacious, easily accessible glass draught shield. This features three smooth-running sliding doors (left, right and top). This well-thought-out design allows both left- and right-handed users equally comfortable, ergonomic and shake-free access to the sample. At the same time, the robust housing made of cast aluminium, combined with antistatic plastic, prevents electrostatic charges from interfering with the highly sensitive sensor. Such charges frequently occur when handling powdery samples or when using plastic containers. The balance is operated via a logically structured, self-explanatory keypad with just 6 keys, so you do not have to navigate through complicated digital sub-menus. For precise horizontal levelling, the instrument features a clearly visible spirit level and non-slip, adjustable levelling screws on the underside.

Connectivity and seamless documentation for your quality management system

In certified, accredited or pharmaceutical laboratories, simply measuring weight is only half the story; seamless, tamper-proof traceability is just as essential. For this purpose, the analytical balance is equipped with a standard RS-232 data interface. Via this port, you can easily and reliably connect the instrument to an optionally available KERN Matrix label printer or an Ethernet adapter. This enables automatic, standards-compliant GLP/ISO report printing, including the current date, the exact time and the specific balance identification number. Furthermore, the balance performs a range of intelligent additional functions for you: in addition to standard weight measurement, the model is capable of percentage weighing (determining the deviation as a percentage from a defined target value) as well as the precise counting of extremely light small parts with a selectable reference count.

Technical Specifications

• Weighing range (max): 220 g
• Resolution (d): 0.0001 g (0.1 mg)
• Settling time: approx. 3 seconds
• Minimum sample weight (USP): 400 mg
• Reproducibility: 0.0002 g
• Linearity: ± 0.0004 g
• Calibration system: Internal (motor-driven, automatic at ≥ 2 °C change or every 3 hours)
• Weighing pan diameter: 90 mm
• Materials: Stainless steel weighing pan, cast aluminium/plastic housing, glass draught shield
• Interface: RS-232 as standard (for printer or PC)
• Housing dimensions (W×D×H): 230 × 310 × 330 mm
• Net weight: approx. 5.0 kg

Contents

• 1 x KERN ADJ 200-4 analytical balance including 3-door glass draft shield
• 1 x stainless steel weighing pan (Ø 90 mm)
• 1 x universal mains adaptor (including adapters for the EU, UK and USA)
• 1 x Detailed operating instructions in German

Individual requirements & accessories

An important detail for your rigorous quality management: even though the balance calibrates itself with high precision, according to many standards this does not replace regular, certified external verification! We therefore strongly recommend ordering the instrument directly from the factory with a DAkkS calibration certificate (formerly DKD). Do you often work with extremely dry, electrostatically charged powders that stick to the spatula? In that case, an external KERN ioniser is the perfect addition to prevent the sample from ‘flying off’ the weighing pan. Please feel free to contact our expert procurement service at any time to put together the ideal accessories – such as anti-vibration tables, matrix printers or calibration certificates – for your specific laboratory workstation.