• EMS850 critical point dryer uses CO₂Replace all moisture in the sample through a series of operations. Place the biological sample to be dried at the critical point in the EMS850 pressure chamber, which is pre cooled to facilitate the filling of liquid CO into the cylinder₂The pressure reaches the critical point, and the chamber is heated just above the critical temperature. At this moment, CO₂Gas is released through a needle valve to prevent sample damage. Using semiconductor heating and gas cooling to control the temperature of the drying chamber, the temperature is controlled between 5 ℃ and 35 ℃. This ensures accurate determination of the critical point and avoids excessive pressure or temperature exceeding. During the heating cycle, the pressure is controlled through a pressure reducing valve. Vertical chamber and top loading ensure that the sample is not covered during the drying process and has a measuring surface observation window.

  The critical point drying method is a drying method designed based on the special physical state of a substance at the critical point. In the critical state, the density of liquid and gas is equal, the gas-liquid interface completely disappears, and the surface tension coefficient of the liquid is zero. The reason why critical point drying method has always been regarded as the most reliable drying method for producing biomedical scanning samples is that this method can eliminate the effect of liquid surface tension, and the dried samples can preserve their natural form to the greatest extent possible. The critical point drying method is suitable for drying various biological samples.

  For small biological samples such as microorganisms, if you want easy operation, you can choose natural drying or dry drying methods; If you want to achieve better results, it is recommended to use the critical point drying method or vacuum drying method.

  Generally speaking, plant tissues with low moisture content, thick cell walls, and wax layers are often dried naturally, while tender and moisture rich tissues require other methods. The critical point drying method and drying method are almost applicable to various types of plant samples, but considering the complexity of the operation, they are generally not selected when simpler drying methods can be used.

  The critical point drying method is a drying method for animal samples. Considering the simplicity of operation, natural drying method can also be used for animal samples with low moisture content and relatively hard observation areas, but critical point drying or vacuum drying method is recommended for samples with high moisture content and relatively soft observation areas.

  Instrument parameters:

  Instrument size	450mm(W)x350mm(D)x175mm(H)
  weight	12Kg
  Sample cavity size	32mm (Dia.) x47mm (H) (3000 psi pressure detection)
  temperature range	0-120°C
  Thermal separation point	40°C
  Pressure Range	0-3000 psi
  pressure relief	1500 psi
  Rupture Disc	1900 psi
  Cooling/heating	+5°C to +35°C
  Two switch valves	Inlet/outlet/refrigeration/needle valve pressure reduction
  power supply	230V 50Hz (Maximum current 3A including pump)
  maintenance	Through a high-pressure resistant trachea and CO2The cylinder is directly connected (the instrument contains a high-pressure air pipe)