Critical point drying is an efficient method of drying delicate samples without damaging its structure through surface tension that occurs when changing from the liquid to the gaseous phase
Key Features
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Compact bench unit
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Economical
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Easy specimen loading
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Easy operation
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Guaranteed personnel safety
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Gentle specimen treatment
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Automatic cooling/heating system
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Conveniently arranged control and display elements
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Magnetic stirrer
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Excellent visual access
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Universal application
Drying water-containing biological specimens in air or under vacuum can drastically alter their structures or even destroy them completely. They must therefore be dried by a gentler method. One well-known method is "Critical Point Drying".
The surface tension of the water in a specimen at the point at which it changes from the liquid phase to the gaseous phase can destroy a delicate specimen. By increasing the pressure and temperature of the specimen it is possible to dry it without crossing a phase boundary. This is possible because once the critical point has been passed, the density of the "liquid" and the density of the "gas" are the same.
The critical point for water is 228,5 bar and 374°C. However, this high pressure and extreme temperature would normally destroy a biological specimen. For this reason the specimen must first be treated in a suitable transitional fluid such as CO2 whose critical point of 73,8 bar and 31°C is considerably more advantageous.
Space saving design with integrated control and supply units
Minimum consumption of the CO2 transitional fluid because of integrated refrigerator (no cooling agent required)
The top loading system with safety screw on cover is ideal for fast, easy specimen insertion
The solenoid high pressure valves are operated from the touchpad keyboard (no difficult-to-use manual valves).
Approved pressure container with bursting membrane and two other independent safety features guarantee absolutely safe operation.
Damaging turbulences caused by admitting and draining fluids too fast or heating them too quickly are reduced to a minimum through the use of apertures of varying sizes and because the heating parameters are adjustable.
The integrated cooling / heating system eliminates the need for external supplies such as cold and hot water.
/D70C1C457DE7519AC125736100460196/$FILE/CPD-030_big.jpg "CPD 030 Critical Point Dryer")
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