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
Adiabatic cooling
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).



Specifications K850
Dimensions and weight450 mm w x 350 mm d x 175 mm h, 12 kg
Recipient30 mm Ø x 40 mm h, vertically mounted with CO2-inlet at top and drain of solvent at bottom
Temperature-/pressure monitoringFitted 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)
ControlsFitted with three valves: fluid inlet, flushing and a gas venting system which uses a fine needle valve to give controlled pressure let down
Magnetic stirrerfor enhanced solvent exchange
Side viewing portgives a good view of the liquid meniscus during filling
Safety cut outfor over pressure (ca. 1.700 p.s.i./ca. 117 bar),
pressure tested up to 3.000 p.s.i./approx. 206 bar
Supplied with1 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
EK4135Microscope cover-slip holder Ø 13 mm
EK4140TEM grid holder, 8 grids
EK4130Holder for bulk samples, ca. 25 x 30 mm
CPD800APots specimen 12.5 mm, porous size 78 μm, 10 pack
For operation a CO2 bottle without pressure reducer but with riser pipe is necessary.


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Product Manager - Electron microscopy & nanotechnology
+49 6151 8806-12
Fax: +49 6151 8806912

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