The osmometer shall be capable of routine osmolality determinations on sample volumes of 10 microliters and shall perform the meas urement automatically once the chamber is sealed. The osmometer shall have an automated thermocouple cleaning cycle and not require any routine maintenance. The vapor pressure method is suitable for the determination of the average molecular weight of polymers which are soluble in a variety of different organic solvents and for the determination of osmolality of aqueous solutions. The osmolality of the patient is determined by freezing point method freezing. An instrument for measuring osmolality by freezing point depression or vapor pressure elevation techniques. The fundamental advantages of vapro have been enhanced with.
Simple to use just lower the head to run the test fast 90 second tests highly reliable, with the fewest moving parts available narrow profile design uses only uses 5 of your bench space 0 to 2000 mosmkg range. The vaporpressure osmometer vpo is used to measure osmotic potential in plant water relations. Calibration of vapor pressure osmometers for molecular. Vapor pressure and freezing point are among the colligative. Used wecor vapro model 5600 vapor pressure osmometer. Osmometer measurements were taken with a vapour pressure osmometer vapro 5600, wescor, logan ut, usa. The vapro osmometer requires a sample volume of only 10 microliters. Specifications vapro vapor pressure osmometer model 5600 manufactured by. The model 5520 is an excellent instrument to determine osmolality at room temperature with the sample in natural equilibrium.
The osmometer shall be a elitech model 5600 or equivalent and shall operate on the vapor pressure depression principle. Discovery diagnostics, canadian distriubor of wescors vapro vapor pressure osmometer. Vaporpressure osmometer article about vaporpressure. This item was in working condition at the time it was removed from the lab. Use of a vapor pressure osmometer to measure brain. The required sample volume is only two to ten microliters ten microliters for routine operation and because the technique is both fast and readily learned. Find out information about vaporpressure osmometer. The sensitive thermocouple and sophisticated electronics provide the means to measure the dew point temperature depression of a specimen with resolution to 0. Vapor phase osmometry university of texas at austin. Vapor pressure osmometers determine the concentration of osmotically active particles that reduce the vapor pressure of a solution membrane osmometers measure the osmotic pressure of a solution. Thank you for purchasing the vapro vapor pressure osmometer.
The vapor pressure osmometer k7000 has been designed to exactly measure the total. With the product code you gain access to the technical documents of this product. An apparatus for measuring the acuteness of the sense of smell. The wescor 5500 vapor pressure osmometer brings unprecedented simplicity, convenience, and accuracy to the routine determination of osmolality to help meet the demands placed on todays clinical laboratory. Osmometer definition of osmometer by the free dictionary.
Vapro vapor pressure osmometer brochure elitechgroup. This product measures dew point by a method which volatilizes, condenses, and revolatilizes a portion of the solvent, and has been demonstiated to provide seriously erroneous data, particulariy in the presence of volatiles, according to lab. Osmometers semimicro osmometer k7400 typical applications for the semimicro osmometer k7400 range from routine testing of physiological fluids such as blood serum and urine in clinics up to quality control of food products like milk or isotonic soft drinks. Direct measurements vapourpressure osmometer and dewpoint. Readjust the thermistors with careful manual bending until a distance of. The osmometer shall be capable of routine osmolality determinations on sample volumes of 10 microliters and shall perform the measurement automatically once the chamber is sealed. The osmometer shall consume no more than 40 watts of electrical power and shall weigh less than 7 kg. Extended range with a switch on the back holdrun which. Osmometer vapro 5600 elitech, for laboratory, rs 767000 unit. Vaporpressure thermometer definition is a thermometer in which the variable saturated vapor pressure of a volatile liquid is used as a measure of the temperature and which thus has the advantage over some other types of thermometers of being free from errors due to. The wescore model 5500 vapor pressure osmometer the wescor vapor pressure osmometer employs the most uptodate method of osmolality determination.
This unit is the method of choice for most fluids in biology and medicine in which water is the solvent. Wescor elitechgroup vapro 5600 vapor pressure osmometer. The wescor vapro machines are the only game in town when it comes to vapor pressure osmometers due to patent issues. Please note that this unit has not been professionally tested, and is being sold as is.
Osmometry a laboratory technique to find the molecular weight of an unknown compound by determining the osmotic strength of a solution. Vapor pressure osmometry is a dynamic method of determining the vapor pressure of solutions. This let the wescor machines take over significant market share. It used to be that freezing point osmometers were priced 30% or more over their vapor pressure cousins. It is a modified isopiestic technique that involves measuring the steadystate temperature difference that develops between a drop of solution and a drop of pure solvent commutually exposed to an atmosphere saturated with. There are a variety of osmometers, including vapor pressure depression osmometers, membrane osmometers, and freezing point depression osmometers. Osmometer definition of osmometer by medical dictionary.
The vapor pressure osmometer k7000 is best suited for. An osmometer is a device for measuring the osmotic strength of a solution, colloid, or compound there are several different techniques employed in osmometry. Multiple c52 chambers can be connected to the cr7 datalogger to function as an automated multichannel osmometer as an osmometer, can do rapid, accurate sampling without freezing 10 microliter samples. The vapro osmometer is an advanced electronic adaptation of the hygrometric method of vapor pressure determination. It stands out for its high performance, data quality, and reliability. This precludes cryoscopic artifacts due to high viscosity, suspended particles, or other conditions that can interfere with freezing point determinations, giving vapro a much broader range of errorfree applications. While mem brane osmometry mo provides a potentially unlimited. A device for the determination of molecular weights by the decrease of vapor pressure of a solvent upon addition of a soluble sample explanation of vaporpressure osmometer. Alternative methods of estimating the water potential at turgor loss. Clifton nanolitre osmometer clifton technical physics osmometer. The wescor osmometer measures the vapor pressure relative humidity by measuring the dew point temperature at which water condensate is in equilibrium with the water vapor in the overlying atmosphere.
It works by taking advantage of the decrease in vapor pressure that occurs when solutes are added to pure solvent. Osmometer an instrument that can find the osmotic strength of a solution or colloid using data from a semipermeable membrane, freezing point depression or vapor pressure. A vapor pressure osmometer was used to measure the osmolarity of the samples from mcb 32 at university of california, berkeley. Measuring relative vapor pressure of organic solvent solutions alcohol, acetone, carbon tetrachloride, toluene, benzine, etc. Wescor vapro vapor pressure osmometer thermal couple. This is a report of a rapid and precise screening procedure, developed for the determination of ethanol in serum using osmolality measurements. Wescor 5500 vapor pressure osmometer alternate names. Vapor pressure and freezing point osmolality measurements.
Vaporpressure thermometer definition of vaporpressure. Use of a vapor pressure osmometer to measure brain osmolality. The fundamental advantages of vapor pressure osmometry are now embodied in the most intelligent osmometer ever. This instrument measures dew point temperature depression of a solution in. This technique can be used for polymers with a molecular weight of up to 20,000. A vapor pressure osmometer was used to measure the. The fundamental advantages of vapor pressure osmometry are now. Vapor phase osmometry vpo, also known as vaporpressure osmometry, is an experimental technique for the determination of a polymers number average molecular weight, m n. Elitechgroup offers the vapro vapor pressure osmometer. Measurement of root and leaf osmotic potential using the. For these reasons, vapor pressure osmometry is the method of choice for most fluids in biology and medicine in which water is the solvent.
Fast membrane osmometer as alternative to freezing point. The osmometer shall be a wescor model 5520 or equivalent and shall operate on. Used in a variety of settings, clinical osmometers measure these levels by deploying one of two methods. Vapro vapor pressure osmometer elitechgroup benelux. The vapor pressure method determines osmolality at room temperature with the sample in natural equilibrium. Vapor pressure and freezing point osmolality measurements applied to a volatile screen. K7000 vapor pressure osmometer dampfdruckosmometer knauer. A thermocouple measures temperature by the voltage between two. The determination of m n operates on the principle that the vapor pressure of a solution is lower than that of the pure solvent at the same temperature and pressure magnitude of the vapor pressure decrease is directly proportional to the molar concentration of solute does not directly measure vapor pressure but measures change in. Osmometers measure the osmotic strength of a sample. The general agreement found for molecular weights determined under a variety of conditions, leads to the conclusion that values as high as 100,000 daltons can be determined by at least one type of vapor pressure osmometer when it is calibrated with a material of 200 daltons. Since then, the vapor pressure method has proven itself in thousands of laboratories and myriad applications. The osmometer has a small chamber to which is sealed a thermocouple hygrometer.
The vapro vapor pressure osmometer, can be used to determine the osmolality in any type of sample. For sale from wescor vapor pressure osmometer 5500. Vapro is the undisputed leader in research osmometry. All of these methods were based on colligative properties such as freezing point depression cryoscopy gross et al. Osmometers vapor pressure osmometer k7000 the vapor pressure osmometer k7000 from knauer is an advanced instrument from one of the pioneers in the field of osmometry with 50 years experience. Wescor 5500 vapor pressure osmometer in stock, we buy. A method is described for determining brain osmolality with a vapor pressure osmometer. Journal of neuroscience methods, 3 1980 25 elseviernorthholland biomedical press 21 use of a vapor pressure osmometer to measure brain osmolality patricia a. The wescor vapro model 5600 vapor pressure osmometer, can be used to. Tornheim department of anatomy, university of cincinnati, college of medicine, 231 bethesda avenue, cincinnati, ohio 45267 u. Information is presented in a stepbystep format to demonstrate the. The new vapro can be used to determine the osmolality in any type of sample. Our customers have rendered a clear verdictvapor pressure osmometry is superior to all other methods.
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