Critical Point Dryer

The design of the EMS 3000 gives unequalled visibility of the critical point drying process and an unsurpassed view of the fluid level in the chamber. Unlike many of the more complex critical point dryer designs, it is much easier to see the phase change at the critical point.

EMS 3000

The design of the EMS 3000 features a horizontal pressure chamber measuring 30.1 mm internal diameter x 82 mm in length. The chamber has an external water jacket for temperature control and specimens are introduced via a removable rear door. The front of the chamber is fitted with a 25 mm diameter window which permits easy viewing of the liquid level.


  • Proven reliability - over 6,000 critical point dryer installations world-wide
  • Simple robust construction - easy to maintain - many critical point dryer users carry out their own routine maintenance
  • Horizontal chamber and large viewing window - excellent visibility of the fluid level and drying process
  • Large robust valves for draining of fluids, ingress of CO2 and venting of gas - very durable; the rapid ingress of CO2 helps prevents pre-drying of specimens
  • Safety - every critical point dryer unit is pressure tested to 2,500psi and a certificate is issued. A pressure bursting disc is also fitted to safeguard against misuse
  • Specimen handling - optional specimen holders for coverslips and TEM grids. Porous pots are available for fragile or very small specimens
  • Three-year warranty

Temperature control

Dial gauges display pressure in the chamber and the temperature of water circulating through the jacket. Three pressure valves permit easy connection to the liquid CO2 cylinder and allow liquid agitation and venting of the chamber. A source of hot running water is essential. Cooling is also useful, especially for sequential process runs or in hot climates.

The temperature of the EMS 3000 and EMS 3100 chamber is raised with a hot water supply. Mains water can be used but a more elegant method involves the use of the optional EMS 3500 Thermocirculator, which is connected directly to the inlet and outlet of the water jacket. The temperature of the circulatory fluid can be pre-set (eg at 37°C, just above the critical temperature).

A second alternative is the model EMS 4860 Recirculating Heater/Chiller, which can be used to pre-cool the chamber to below ambient prior to loading specimens and then to heat the chamber to the critical temperature.

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SKU: E3000
Pack: Each
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