Kern PNJ 600-3M precision balance, 620 g / 0.001 g, internal adjustment

The Kern PNJ 600-3M weighs up to 620 g and has a readability of 0.001 g. The weighing system is a tuning-fork system; the balance adjusts itself automatically and internally. Kern describes this automatic adjustment function as ideal for applications subject to legal metrology requirements.

Tuning-fork weighing system

Kern employs a tuning-fork weighing system here, which displays the weight reading quickly, allows for precise dosing and is mechanically robust. Reproducibility and readability are both 0.001 g, whilst linearity is ± 0.004 g. Under laboratory conditions, the stabilisation time is 3 seconds and the warm-up time is 4 hours. The minimum load is 0.02 g, whilst the minimum weight according to USP is 2 g. A rising bar graph display shows the remaining available weighing range.

Internal automatic adjustment

The balance adjusts automatically using an internal weight. According to Kern, this maintains high accuracy and makes it location-independent. For checking purposes, the Safety Set 315-109-206 is available, comprising 50 g (F1) and 500 g (E2). A DAkkS calibration is available under item no. 963-103. We can advise you on verification and the validity of verification upon request.

Glass draught shield and weighing pan

The stainless steel weighing pan has a diameter of 140 mm and is shock-resistant. The large glass draught shield with three sliding doors has a weighing chamber measuring 172 x 171 x 160 mm. With the glass draught shield fitted, the balance measures 196 x 293 x 266 mm and weighs 4.2 kg net. Kern highlights the compact dimensions as an advantage in confined spaces. A spirit level and adjustable screw feet are included. The display features 16.5 mm high backlit digits and has no IP rating.

Counting, carats, data output

Automatic reference optimisation during piece counting gradually refines the average value of the piece weight. The minimum piece weight is 10 mg, or 1 mg under laboratory conditions, with a counting resolution of 620,000. In carats, the balance displays up to 3,100 ct with a readout of 0.01 ct. RS-232 is fitted as standard. Kern offers the MLB-A05 interface cable (1.5 m), the YKI-02 Bluetooth adapter, converters for Ethernet and Wi-Fi (YKI-10, YKI-11, YKI-12) and the YKG-01, YKH-01, YKC-01 and YKT-01 printers. The power supply operates at 220 to 240 V and 50 Hz and is supplied with adaptors for Australia, Switzerland, the EU, the UK and the USA.

Typical applications

Based on the technical specifications and manufacturer’s information, the following applications are possible:

• Weighing in the milligram range up to 620 g
• Dosing with rapid display via the tuning fork system
• Applications subject to legal metrology requirements, provided that the verification (option 965-216) is ordered at the same time
• Piece counting from a unit weight of 10 mg
• Weighing of gemstones in carats up to 3,100 ct

For comparison, from the Kern range: with a readability of 0.0001 g at 220 g, the Kern ADB 200-4 offers finer weighing; the Kern ABT 100-5NM offers a readability of 0.00001 g at 101 g. For 2,000 g at 0.1 g, there is the Kern PCB 2000-1.

Frequently asked questions

How is the PNJ 600-3M adjusted?
Internally and automatically using a built-in weight.

Is the balance suitable for applications subject to legal metrology requirements?
The PNJ 600-3M is optionally available ex-works with conformity assessment (verification) (option 965-216, accuracy class II, verification scale interval e = 0.01 g). For applications subject to legal metrology requirements, the option must be ordered at the same time; subsequent initial verification is not possible.

How big is the weighing pan?
140 mm in diameter, made of stainless steel.

How long does the balance need to warm up?
The warm-up time is 4 hours.

How long is the warranty?
According to Kern & Sohn, this device comes with a 3-year warranty. Kern grants 3 years on products with a list price of €500 or more and 2 years on products below that and on components; wear parts such as batteries and rechargeable batteries are excluded. Warranty repairs are carried out by Kern or by a Kern dealer.

Technical details

Scope of delivery

• PNJ 600-3M precision balance with glass draught shield
• Mains power supply with mains adaptors for Australia, Switzerland, the EU, the UK and the USA
• Protective working cover

Regulatory information

As an electrical device, the balance falls under the ElektroG. The manufacturer Kern & Sohn GmbH is registered under the WEEE registration number DE 80821200. How to return old appliances is described on the page Environment and disposal.

Individual requirements and procurement service

Kern offers protective working covers (PNJ-A01, also available in packs of 5), test weights, interface cables, converters, printers, as well as anti-vibration tables and anti-vibration plates for the PNJ 600-3M. We can advise you on your selection. Enquiries are handled through our procurement service.