The OSMOMAT 010 is a universal cryoscopic osmometer for the determination of molar masses in benzene solution and the determination of the total osmolality in aqueous solutions. It is based on the well accepted measuring system of the OSMOMAT 030, which has been used for many years.
The OSMOMAT 010 is suitable for measuring freezing points of solvents of aqueous and organic solutions which have a freezing point between +10 and -5°C. The instrument is especially useful for rapid quality control measurements in industrial facilities as well as for research in scientific laboratories.
•automatic calibration by switch
•no ice formation in the lower cooling system: reliable measurements even for long working periods
•measuring time approximately 1 min: valuable in case of serial measurements
•measurements and determination microprocessor controlled
•minimum sample volume: 50µL
•disposable plastic measuring vessels save time and costs
•automatic error detection and display
•optional measurement documentation by integrated matrix printer: date, time, sample number and measuring result are printed
For the determination of the molar mass, the OSMOMAT 010 has to be calibrated first with the pure solvent and then with a solution with known molal concentration. It is then possible to adjust the zero point of the solvent with the range of -5ºC to 10ºC. The cell constant can be obtained from the calibration measurement, which then is used in the determination of the molar mass calculation.
For the sample measurement, solutions of concentrations of about 5 to 140 g/kg solvent will be prepared depending on the expected molecular weight. For the determination of molar masses below 1000 g/mol, a single point measurement is normally sufficient. Nonpolar substances may behave in a non-linear fashion in respect to the ratio measured value/concentrations in the range of low molecular weights and at least 3 solutions with graded concentrations should be measured.
The values obtained in this way have to be treated by means of linear regression analysis.
The total osmolality of aqueous solutions is determined by comparative measurements of the freezing points of pure water and of solutions. Water has a freezing point of 0ºC, a solution with saline concentration of 1 Osmol/kg has a freezing point of -1.858ºC.
|Duration of the measurement:
||0,5 % of calibrated value
||4 1/2 digit
||up to approx. 3000 mOsmol/kg
in benzene approx. 40 up to 5000 dalton
||1 mOsmol/kg over the
entire measuring range
in benzene approx. 3 digit/mMol/kg
||by means of two separate
peltier cooling systems
with heat dissipation by air
|Stand by temperature:
||› 0 °C
ambient temperature: approx. 10 °C upto 35 °C
||alpha-numerical matrixprinter, 5x7 matrix,
date, time for each measurement,
4-digit sample number,
4-digit measuring result,
normal paper, 43mm, automatic paper feed
or with pushbutton,
endless ink ribbon cassette, exchangeable,
printer function switch on/off with pushbutton,
clear error messages
||through standardized 5-pole socket,
output voltage 1 mV/digit
|RS data output:
||standardized interface RS 232 C
||220 x 205 x 360 mm
||approx. 7 kgs
||230 V (+/- 30 V), 50-60 Hz, 120 VA
or 110 V (+/- 15 V), 50-60 Hz