FEDELCO, S.L.

The K750X Freeze Dryer, operates at rotary pump vacuum using a 'peltier' thermoelectric stage, with drying temperatures of the order of -60^oC, with back-up water cooling at a nominal 15^oC. Both the temperature and the timer can be pre-selected, and the drying cycle will be completed automatically. Provision is made at the end of the drying cycle to allow the specimen to assume room temperature, or be subsequently warmed prior to embedding. Disposable desiccant containers are located in the preparation chamber to enhance the water vapour removal, and with a suitable container, the vacuum chamber can be utilised to prepare liquid nitrogen 'slush' for fast freezing.

Features:	Benefits:
Thermoelectric cooling and heating	Accurate temperature control
Peltier Cooling/Warming Stage	Convenient to use
Accurate Time Monitoring	Pre-select drying cycle
Automatic Drying Cycle	Convenient to operate
Modular control electronics	Easy to operate

Instrument Case - 450mm W x 350mm D x 175mm H Work Chamber - Borosilicate Glass 165mm Dia x 125mm H Safety Shield - Polycarbonate Weight - 18Kg Specimen Stage - -60^oC to +60^oC Vacuum Gauge - ATM -1x10^-2mBar Temperature Controller & Monitor - -90^oC to +90^oC, Display Resolution to 0.1^oC Timer - 0 to 999 Hours.

Options: K50 Water Chiller, K250 Carbon Coating Attachment, K350 Sputter Coating Attachment

Services - Water Cooling at Nominal 15^oC Electrical Supply - 230 Volts 50Hz (6 Amp Max. Including Pump) 115 Volts 60Hz (12 Amp max. including Pump) Vacuum Pump - Pump No. 5 Complete with Vacuum Hose and Oil Mist Filter 85L/Min. 5m³/Hr. Size - 470mm L x 150mm W x 150mm H Weight -20Kg

The K775X Turbo Freeze Drier can operate at temperatures down -140^oC and employs a turbomolecular pumping unit, backed by a rotary vacuum pump. The lower temperatures are achieved by using a liquid nitrogen fed cold stage from a dewar on the unit, giving several hours holding time, which can be topped up by hand as required. Preferably an auto top-up system consisting of level sensor and free standing 30 or (60) Litre pressurised dewar, giving several days unattended operation.

The pre-frozen specimens are admitted into the cooled stage of the drying chamber, through the lid with a sample transfer holder. (Two such holders are provided, for TEM grids and SEM stubs.) The system incorporates both time and temperature control, and at the end of the drying period, the stage may be heated prior to specimen removal. A microprocessor x10 segment sequence control allows 10 time periods and 10 temperature settings to be programmed to achieve a range of drying protocols, up to 10 different protocols can be stored for future use. The system also has facilities for purging with Nitrogen Gas. For extended drying periods, an auto top-up device can be provided as an option to continuously 'fill' the chamber's liquid nitrogen dewar.

The option of a custom designed specimen freezing chamber to produce 'slushy' subcooled liquid nitrogen is available which also interfaces to the specimen transfer chamber. The option for Carbon Coating Attachment to carbon coat without breaking vacuum is available and similarly an option for a Sputter Coating Attachment.

Instrument Case - 450mm W x 350mm D x 175mm H Work Chamber - Borosilicate glass 165mm Dia x 125mm H (with polycarbonate implosion shield) Safety Shield - Polycarbonate Stainless Steel Base - 110mm Dia x 115mm H Weight - 42Kg Specimen Stage - 140^oC to +40^oC (Initial cool down to -140^oC in approx. 45 minutes, final temperature can be lower at -140^oC or better) Temperature Monitor - - 140^oC to +40^oC Timer - 0 to 999 Hours Sequence Controller - 10 Times and 10 temperatures Vacuum Gauge Range - Atmos to 1 x 10^-5 mBar Operating Vacuum - 1 x 10^-2mBar to 1 x 10^-5mBar Turbomolecular Pump - 60 Litres/second (ultimate vacuum 1 x 10^-6mBar) Cooling - By liquid nitrogen conductive cooling from 1 Litre dewar fitted to the chamber of the unit Backing Pump - A backing pump for the turbo is required, this should be two stage 30 L/min or similar. 2m³/hr