KNAUER is one of the pioneers in the field of osmometry and known for its reliable and user friendly instruments for many decades.
Our freezing point osmometer K-7400S allows the easy and fast determination of the osmolality of various aqueous solutions. Also, the freezing point depression of the samples can be read. The proven technology of freezing point determination in combination with the robust and intelligent design of the device allows 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 measurement specifications of the KNAUER Semi-Micro Osmometer K-7400S comply with the requirements of the European Pharmacopoeia for osmolality (Ph. Eur. 2.2.35, 10/2021).
Scope of delivery:
K-7400S with measuring head in measurement position
K-7400S with measuring head in park position
K-7400S front view
Made in Germany
60 years experience
Fast measurements
| Sample volume | 150 µl (50 µl when using measuring head A0840-4) |
|---|---|
| Osmolality range | 0 - 2000 mOsmol/kg |
| Resolution | osmolality: integer value without decimal part, e.g. 850 mOsmol temperature: value with three digits, e.g. -1.576 °C |
| Test time | ~ 2 min |
| Precision | SD ≤ 4 mOsmol/kg [0 — 400 mOsmol/kg] RSD ≤ 1 % [400 — 2000 mOsmol/kg] |
| Linearity | ± 1 % [0 -1500 mOsmol/kg] ± 1.5 % [0 - 2000 mOsmol/kg] |
| Calibration | Two-point calibration (0 mOsmol/kg and one freely selectable osmolality) optional: Three-point calibration (0 Osmol/kg and two freely selectable osmolalities) |
| Interfaces | RS-232 port |
|---|---|
| Control | Keypad (LED display, 2 rows with 24 characters) optional: EuroOsmo7400 Software |
| Power supply | 100 – 240 V, 50 – 60 Hz, 70 W |
|---|---|
| Dimensions | 160 x 182 x 340 mm (W x H x D) |
| Weight | 5.3 kg |
| Ambient conditions | Temperature range: 10–35 °C Rel. humidity: 20–80 % (non-condensing) |
| Note | The 150 µl measuring head A0840-2 is included in the scope of delivery of the device. For sample volumes of 50 µl, the measuring head A0840-4 should be used and must be ordered separately. |
100 Pack of plastic sample tubes for Semi-Micro Osmometer K-7400S
Article No.: A02721
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500 Pack of plastic sample tubes for Semi-Micro Osmometer K-7400S
Article No.: A0272
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1000 Pack of plastic sample tubes for the Semi-Micro Osmometer K-7400S
Article No.: A0720
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Pack of 12 ampules NaCl calibrating solution, 100 mOsmol/kg
Article No.: A01242
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Pack of 12 ampules NaCl calibrating solution, 300 mOsmol/kg
Article No.: A01240
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Pack of 12 ampules NaCl calibrating solution, 400 mOsmol/kg
Article No.: A01241-1
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Pack of 12 ampules NaCl calibrating solution, 850 mOsmol/kg
Article No.: A01250
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Pack of 12 ampules NaCl calibrating solution, 2000 mOsmol/kg
Article No.: A01248
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Cleaning tissue, lint-free, for thermistor cleaning
Article No.: A02330
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150 µl measuring head for plastic sample tubes; compatible with the K-7400 and the K-7400S Semi-Micro Osmometer
Article No.: A0840-2
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50 µl measuring head for plastic sample tubes; compatible with the K-7400 and the K-7400S Semi-Micro Osmometer
Article No.: A0840-4
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EuroOsmo 7400 - software for K-7400 and K-7400S osmometers
Article No.: A3705
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Plain paper printer for freezing point osmometer K-7400 and K-7400S
Article No.: A3711
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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.
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In addition, we have extended documentation about all our products, including CE Declarations of Conformity.
See all CE Declarations of conformity
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