K-7400S Semi-Micro Osmometer from KNAUER

KNAUER is one of the pioneers in the field of osmometry and known for its reliable and user friendly instruments for many decades. The newest freezing point Osmometer K-7400S allows easy and fast determination of the osmolality of various aqueous solutions. In addition, the freezing point depression of such samples can be measured.

The proven technology of freezing point determination in combination with the robust and intelligent design of the device allows fast and reproducible measurements. The instrument is equipped with a peltier cooler and an integrated microprocessor controlling the automated measurement.

The freezing point Osmometer is a standalone device that optionally can be equipped with a printer. Furthermore, the device can be controlled via the EuroOsmo 7400 software. The software automatically plots the temperature curve for each measurement and calibration and allows saving of the measured values. In addition, the data can optionally be exported into various file formats for archival storage.

Key Features

  • High precision measuring head - Made in Germany
  • Variable sample volume between 50 and 150 µl
  • Software EuroOsmo 7400 for control and data management
  • Easy and fast measurement of solutes
  • Small, quite and robust - Perfect for your lab

Technical parameters

Sample volume

50 - 150 µl

Osmolality range

0 - 2000 mOsmol/kg


1 mOsmol/kg

Test time

~ 2 min


SD ≤ 4 mOsmol/kg [0 - 400 mOsmol/kg]

RSD ≤ 1 % [400 - 2000 mOsmol/kg]


± 1 % [0 -1500 mOsmol/kg]

± 1.5 % [0 - 2000 mOsmol/kg]


Two-point Calibration (0 mOsmol/kg and one free selectable osmolality)

optional: Three-point Calibration (0 Osmol/kg and two free selectable osmolalities)



RS-232 port


Keypad (LED display, 2 rows with 24 characters)

optional: EuroOsmo7400 Software


Power supply

100 - 240 V, 50 - 60 Hz, 70 W


160 x 182 x 340 mm (W x H x D)


4.5 kg

Ambient conditions

10 - 35 °C

20 - 80 % relative humidity (noncondensing)