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K-7400S Semi-Micro Osmometer
Article No.: A0006AC

Freezing point osmometer

KNAUER is one of the pioneers in the field of osmometry and known for its reliable and user friendly instruments for many decades. Our newest freezing point Osmometer K-7400S allows the 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.

The K-7400S Semi-Micro Osmometer complies with the European Pharmacopoeia for osmolality (2.2.35, 01/2012).






Key Features

Technical Data


Osmolality range 0 - 2000 mOsmol/kg
Sample volume 50 - 150 µl
Test time ~ 2 min

Technical parameters

Ambient conditions 10 - 35 °C 20 - 80 % relative humidity (noncondensing)


Power supply 100 - 240 V, 50 - 60 Hz, 70 W
Dimensions 160 x 182 x 340 mm (W x H x D)
Weight 4.5 kg


Linearity ± 1 % [0 -1500 mOsmol/kg] ± 1.5 % [0 - 2000 mOsmol/kg]
Calibration Two-point Calibration (0 mOsmol/kg and one free selectable osmolality) optional: Three-point Calibration (0 Osmol/kg and two free selectable osmolalities)


Interfaces RS-232 port
Control Keypad (LED display, 2 rows with 24 characters) optional: EuroOsmo7400 Software
Precision SD ≤ 4 mOsmol/kg [0 - 400 mOsmol/kg] RSD ≤ 1 % [400 - 2000 mOsmol/kg]
Resolution 1 mOsmol/kg

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