EQUIPMENT & ACCESSORIES CATALOG EDITION IV CRITICAL POINT DRYERS


zzz K850 Critical Point Dryer with Thermoelectronic Heating and Adiabatic Cooling


The K850 Critical Point Dryer is designed for use with CO2, having first replaced any water in the specimen by a series of dehydration, often in the same fluid such as Acetone, which will also be the intermediate fluid.


(Wet Specimen)–Water–Acetone–30%–100%–CO2– C.P.D.–(Dry Specimen)


The specimens for critical point drying are located in the pressure chamber of the K850. The chamber is pre-cooled to allow it to be readily filled with liquid CO2 from a gas cylinder. The chamber is then heated to just above the critical temperature with subsequent critical pressure being achieved. The CO2 gas is vented through a needle valve, to avoid specimen distortion.


The K850 is fitted with thermoelectronic Heating and Cooling and Temperature control of +5°C on Cooling, and +35°C on Heating. This ensures the critical point is accurately obtained, avoiding excess pressures or temperatures, or the need to rely on pressure relief valves to control pressure during the heating cycle. The chamber is vertical, with top loading, to ensure specimens do not become uncovered during the drying process, with a side viewing port to locate the miniscus for the correct level when initially filling the chamber.


The K850 is fitted with a fine let down needle as standard and flow gauge is no longer required.


FEATURES


z Vertical chamber with top filling and bottom draining. z Normal operating temperature 35°C pressure 1500 psi. z Thermoelectric Peltier cooling and heating. z Fine control needle valve pressure letdown.


z Illuminated chamber with side viewing port and protective ‘Lexan’ shield.


z Stirrer system for enhanced solvent exchange. z Temperature monitoring and control with thermal cut-out protection.


z Pressure monitoring with pressure relief valve and rupture disc protection.


z Polycarbonate safety shield. SPECIFICATIONS


Instrument Case Weight


Specimen Chamber Temperature Gauge


Thermal Cut-Out Pressure Gauge Pressure Relief Rupture Disc


Peltier Cooling/Heating Two On/Off Valves Supply


Services 56


450mm (W) x 350mm (D) x 175mm (H) 12Kg


30mm (Dia.) x 40mm (H) (Tested to 3000 psi)


0-120°C 40°C


0-3000 psi At 1500 psi At 1900 psi


+5°C to +35°C Inlet/Outlet/Cool/Vent Needle Valve Letdown


115V 60Hz (6 Amp Max) 230V 50Hz (3 Amp Max)


Requires CO2 gas cylinder direct connection by high pressure hose. (High pressure hose included with instrument.)


ORDERING INFORMATION 91090


Replacement Parts 91091


91092 Mesh Basket Porous Spec Pots K850 Critical Point Dryer complete each each 10/pack)


X = More than half full Y = Approximately half full Z = Less than half full


Cross-sectional view of chamber, showing miniscus viewing position.


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