Measuring relative vapor pressure of organic solvent solutions alcohol, acetone, carbon tetrachloride, toluene, benzine, etc. View detailed import data, price, monthly trends, major importing countries, major ports of 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. K7000 vapor pressure osmometer dampfdruckosmometer knauer. You will find it to be a valuable investment and an important partner in the laboratory. What links here related changes upload file special pages permanent link page. This is the first study to demonstrate suitability of the dewpoint hygrometer in comparison to the vapour pressure osmometer to measure. An osmometer is a device for measuring the osmotic strength of a solution, colloid, or compound there are several different techniques employed in osmometry.
Bersted bh 1973 molecular weight determination of high polymers by mean of vapor pressure osmometry and the solute dependence of the constant of calibration. Oct 03, 2011 iv been using wescor 5600, and it works really well, and can do test on most of samples that other machine cant. Advanced instruments model 3250 singlesample osmometer model 3250 singlesample osmometer spectrophotometers, refractometers and benchtop instruments. Considerations for osmolality measurement under elevatedpco2. The osmometer has a small chamber to which is sealed a thermocouple hygrometer. Most recently ive used a vapor pressure osmometer from wescor vapro 5520. Jan 24, 2014 for sale from wescor vapor pressure osmometer 5500. Documents document view page advanced instruments 3250. Specifications vapro vapor pressure osmometer model 5600 manufactured by. Advanced instruments model 3250 singlesample osmometer model. The vapor pressure osmometer k7000 has been designed to exactly measure the total osmolality of physiological fluids and to determine the average molecular mass of polymers in aqueous or organic solutions. Comparison of vapor pressure and freezing point osmometry osmolality increases with pco2 in bioreactors with ph. 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. Wescor inc model 5600 the vapro vapor pressure osmometer, can be used to determine the osmolality in any type of sample.
The wescor vapro machines are the only game in town when it comes to vapor pressure osmometers due to patent issues. Use of a vapor pressure osmometer to measure brain osmolality. Osmotic pressure as a functional characteristic of ap. It used to be that freezing point osmometers were priced 30% or more over their vapor pressure cousins. It stands out for its high performance,data quality and reliability. Used wecor vapro model 5600 vapor pressure osmometer. The vapro 5600 requires a sample volume of only 10 microliters and osmolality is displayed in 90 seconds.
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. A method is described for determining brain osmolality with a vapor pressure osmometer. Osmolality was measured with vaprorvapor pressure osmometer model 5600. Wescor 5500 vapor pressure osmometer in stock, we buy sell. Vapor phase osmometry university of texas at austin. Vapor pressure osmometer k700 knauer gmbh description. The vapor pressure osmometer k7000 is best suited for. We used a utube oscillator to measure density dma 35a, anton paar. Scientific equipment sales and service we buy used equipment.
This let the wescor machines take over significant market share. A vapor pressure osmometer was used to measure the osmolarity of the samples from mcb 32 at university of california, berkeley. For sale from wescor vapor pressure osmometer 5500. It stands out for its high performance, data quality, and reliability. Vapor pressure osmometry is a dynamic method of determining the vapor pressure of solutions. The vapro osmometer requires a sample volume of only 10 microliters. 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. Vapro is the undisputed leader in research osmometry. Osmolality of cerebrospinal fluid from patients with. A modification of the sample holder of a vapor pressure osmometer is described allowing exposure of the blood sample to a gas mixture with known concentration of co2 and o2 while inside the closed. 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 vapor pressure osmometer. Idiopathic intracranial hypertension iih is a relatively rare condition with increased intracranial pressure icp of unknown etiology 1, 2.
All samples were measured on a wescor vapro 5600 vapor pressure osmometer vpo using published methods. The osmometer shall have an automated thermocouple cleaning cycle and not require any routine maintenance. 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. Laboratory model freezing point osmometer for 30 l samples, featuring. Wescors vapro vapor pressure osmometer model 5600 discovery diagnostics ordering information canadian customers please call toll free within canada. This item was in working condition at the time it was removed from the lab. The osmometer shall consume no more than 40 watts of electrical power and shall weigh less than 7 kg. Find out information about vapor pressure osmometer. Both the osmometer and hygrometer methods ranked genotypes with a very high similarity rs 1, r2 0. Statsoft statistica 25 software was used for variance analysis, while. Used wescor, vapor pressure 5500, osmometer for sale. Vapor pressure osmometer article about vapor pressure osmometer by the free dictionary. Osmometer measurements were taken with a vapour pressure osmometer vapro 5600, wescor. This instrument measures dew point temperature depression of a solut.
We recommend that you become thoroughly familiar with the operation procedures and troubleshooting techniques. The vapor pressure osmometer k7000 from knauer is an advanced instrument from one of the pioneers in the field of osmometry with more than 40 years of experience. The vapor pressure osmometer k7000 has been designed to exactly measure the total. The osmometer shall be a wescor model 5600 or equivalent and shall operate on the. Autocalibration, a selfcleaning thermocouple, selfdiagnostics, statistical analysis, and computer interfaceprintout capabilities make the vapro, osmometer a must for any busy laboratory. Wescor inc vaprot vapor pressure osmometer vapro pressure. The determination of mn operates on the principle that the vapor pressure of a solution is lower than that of the pure solvent at the. Thank you for purchasing the vapro vapor pressure osmometer. Alternative methods of estimating the water potential at turgor loss. 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 separated from pure solvent by a. Used wescor, vapor pressure 5500, osmometer for sale 838851603. Liquid has been spilled into the interior of the product. Please note that this unit has not been professionally tested, and is being sold as is.
As a result, the instrument has great versatility in clinical medicine or biomedical research. Vapor pressure measurement is the fastest and easiest method of determining osmolality, and the thermodynamic limitations of vapor pressure osmometry are least restrictive. Request pdf considerations for osmolality measurement under elevatedpco2. This unit is the method of choice for most fluids in biology and medicine in which water is the solvent. The fundamental advantages of vapor pressure osmometry are now embodied in the most. The new vapro can be used to determine the osmolality in any type of sample. Vapor pressure and freezing point are among the colligative proper. Buyers specifications the osmometer shall be a wescor model 5600 or equivalent and shall operate on the vapor pressure depression principle. Osmomat 070 vapor pressure osmometer the osmomat 070 is suitable for the determination of the average molecular weight mn of polymers which are soluble in different organic solvents and for the determination of the osmolality of aqueous solutions. Paraphrased from the instructions for the wescor osmometer. 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. The osmometer shall be a elitech model 5600 or equivalent and shall operate on the vapor pressure depression principle. Measurement of root and leaf osmotic potential using the.
The osmometer shall be a wescor model 5600 or equivalent and shall operate on the vapor pressure depression principle. The small sample requirement allows you to assay hardtoget or expensive samples using the superior characteristics of the vapor pressure method. Singlesample osmometer, model 3250, advanced instruments. Wescor inc vapro vapor pressure osmometer manufacturer. With the product code you gain access to the technical documents of this product. Osmometry concentration determination is one of the most widely useful laboratory measurements, with applications ranging from quality control in the manufacture of pharmaceuticals, food products, eye care solutions, to monitoring the fluid balance and hydration processes of animals from fish to humans. The wescor vapor pressure osmometer employs the most uptodate method of osmolality determination.
Experimental atombyatom dissection of amide amide and. Singlesample osmometer, model 3250, advanced instruments osmometers this singlesample osmometer utilizes the freezingpoint depression method with 0. Advanced instruments 3250 osmometer user manual this is the document view page. 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. Supporting information for evaluation of a densitybased. 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. Osmometry provides a means of obtaining the activity. Advanced instruments model 3250 singlesample osmometer. Alternative methods of estimating the water potential at turgor.
Vaporpressure osmometer article about vaporpressure. This instrument measures dew point temperature depression of a solution in vapor equilibrium in a closed chamber. A vapor pressure osmometer was used to measure the osmolarity. The wescor vapro model 5600 vapor pressure osmometer, can be used to determine the osmolality in any type of sample. The vapro vapor pressure osmometer brings unprecedented simplicity, convenience, and accuracy to the routine determination of osmolality to help meet the demands placed on todays. The vapro osmometer is an advanced electronic adaptation of the hygrometric method of vapor pressure determination. A vapor pressure osmometer was used to measure the. Vapro vapor pressure osmometer elitechgroup benelux. This instrument is in likenew condition and is priced at less than half the cost of a new one.
Measurement of root and leaf osmotic potential using the vapor pressure osmometer article in environmental and experimental botany 531. Measurement of root and leaf osmotic potential using the vaporpressure osmometer article in environmental and experimental botany 531. The vapro vapor pressure osmometer, can be used to determine the osmolality in any type of sample. The model 5520 is an excellent instrument to determine osmolality at room temperature with the sample in natural equilibrium. Wescor 5500 vapor pressure osmometer in stock, we buy. Effect of molecular weight of draw solute on water. Model 5600 vapro vapor pressure osmometer discovery diagnostics. Singlesample osmometer, model 3250, advanced instruments vwr. Direct measurements vapourpressure osmometer and dewpoint. Care should be taken when decoding any serial keypadbeeper test port logs after a code3 data6 sequence.
Calibration of vapor pressure osmometers for molecular weight. 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. Vapor phase osmometry vpo, also known as vapor pressure osmometry, is an experimental technique for the determination of a polymers number average molecular weight, m n. 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 solvent vapor. It works by taking advantage of the decrease in vapor pressure that occurs when solutes are added to pure solvent. For these reasons, vapor pressure osmometry is the method of choice for most fluids in biology and medicine in which water is the solvent. The required sample volume is only two to ten microliters ten microliters for routine operation and. The vapro users manual is your key to efficiently operating this instrument. Vapor phase osmometry vpo, also known as vaporpressure osmometry, is an experimental. Elitechgroup offers the vapro vapor pressure osmometer. Alternative methods of estimating the water potential at. The fundamental advantages of vapor pressure osmometry are now.
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