Automatic critical-point dryer
K850/K850WM from Quorum Technologies
Critical point dryer K850 combines versatility and ease of operation. Built-in thermo-electric heating and adiabatic cooling allow precise temperature control. The vertical pressure chamber (32 mm in diameter x 47 mm in height) has a side viewing port which allows a clear view of the liquid meniscus.
K850WM is a compact device for drying a complete 6” wafer. A convenient wafer holder allows quick transfer and avoids pre-drying.
|Automatic thermoelectric heating|
|Digital temperature monitor|
|K850WM option for 6“/150 mm wafers|
Critical point dryers are used for drying biological samples prior to examination in a scanning electron microscope. Further areas of application are the dehydration of samples in pharmacology, histology and pathology. Critical point dryers are also more and more used in the semiconductor industry to avoid the tearing of extremely fine structures during the drying process. As a precondition, water has to be removed from the sample by replacing it with an increasing alcohol concentration. After the alcohol has been completely expelled by liquid CO2 during the drying process, the temperature in the pressure chamber can be increased. As a result, the chamber pressure also increases. When the critical point is reached, the carbon dioxide phases dissolve. After draining the CO2, the sample is dry without being exposed to a phase boundary (liquid/gaseous).
|Dimensions and weight||450 mm w x 350 mm d x 175 mm h, 12 kg|
|Recipient||30 mm Ø x 40 mm h, vertically mounted with CO2-inlet at top and drain of solvent at bottom|
|Temperature-/pressure monitoring||Fitted with thermo-electric heating and adiabatic cooling enabling temperature control of +5 °C cooling and +35 °C during heating, thermometer (0 – 120 °C) und manometer (0 – 2.000 p.s.i./ca. 137 bar), normal working temperature and -pressure 35 °C @ 1.350 p.s.i. (approx. 93 bar)|
|Controls||Fitted with three valves: fluid inlet, flushing and a gas venting system which uses a fine needle valve to give controlled pressure let down|
|Magnetic stirrer||for enhanced solvent exchange|
|Side viewing port||gives a good view of the liquid meniscus during filling|
|Safety cut out||for over pressure (ca. 1.700 p.s.i./ca. 117 bar),|
pressure tested up to 3.000 p.s.i./approx. 206 bar
|Supplied with||1 x stainless steel specimen holder (12 compartments: 8 mm Ø x 8 mm), 10 x PTFE porous specimen pots (12.7 mm x 15.7 mm, pack 10), high pressure CO2 hose, operating manual & test certificate|
|EK4135||Microscope cover-slip holder Ø 13 mm|
|EK4140||TEM grid holder, 8 grids|
|EK4130||Holder for bulk samples, ca. 25 x 30 mm|
|CPD800A||Pots specimen 12.5 mm, porous size 78 μm, 10 pack|
|For operation a CO2 bottle without pressure reducer but with riser pipe is necessary.|