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Article No.: A50055-2
Articlename: Autosampler 3950

Autosampler 3950

biocompatible preparative cooling version

The Autosampler 3950 can inject from up to 768 positions when equipped with microtiter plates (either high or low formats) or from up to 96 standard 2 ml sample vials. Sample carryover is significantly minimized thanks to a highly-effective interior and exterior needle wash procedure. This autosampler is also fast and flexible: one complete sample injection cycle takes less than one minute, including needle wash. “partial loop filling” (variable volumes, e.g. for dilution series) is supported. The headspace pressure function prevents bubbles from forming in the vial during sample uptake. Precolumn derivatization is supported.

Preparative version for sample volumes up to 10 ml with biocompatible flow path.

Key Features

Technical Data

Sample injection

Sample capacity 24 vials, 10 ml each (LSV)
Vial/plate dimensions max. plate/vial height: 47 mm (incl. septa or capmat)
Injection volume range 1–10000 µl programmable
Sample loop 10 ml
Dispenser syringe 2500 µl
Headspace pressure built-in compressor, only for vials with septum
Switching time inj. valve < 100 ms
Piercing needle precision ± 0.6 mm
Sample tray cooling 4-20°C
Vial detection missing vial/well plate detection by sensor
Needle wash programmable: wash between injections and wash between vials
Wetted materials PEEK,Tefzel®, Vespel®, glass, Teflon®.

Analytical performance

Injection modes partial loopfill
Injection volumes 1–5000 µl, 1 µl increments
Sample carryover RSD ≤ 1.0 % for partial loopfill injections, injection volumes > 10 µl up to 50 % of the installed sample loop
Injections per vial max. 9 injections
Analysis time max. 9 h, 59 min, 59 s


Inputs 2 programmable TTL inputs (next injection, freeze, stop)
Outputs 1 programmable relay output (inject marker, auxiliary, alarm)
Control Ethernet (LAN)

Technical parameters

Ambient conditions temperature range: 4–40 °C; 39.2–104 °F air humidity: below 90 % humidity (non condensing)


Power supply 90–230 V AC ± 10 %; 50–60 Hz; 200 VA
Dimensions 300 x 360 x 510 mm (W x H x D)
Weight 21 kg

Documents and more information

Certified Quality 

KNAUER is known for the quality of its products and has been certified several times. We produce high-tech laboratory instruments for research, routine analysis and production for 59 years.
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In addition, we have extended documentation about all our products, including CE Declarations of Conformity.
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