ST 550 is a fully-automatic cryostat microtome whose specimen's forward and backward movements are controlled by the motor

So it can get high-quality sections and easily operated.

• It is designed under overall engineering and ergonomic concept. All the components are processed by a computer numerical controlled machine.
• The retraction function prevents specimen damage from the blade.
• Total thickness calculation.
• The low-temperature refrigeration system with environment-friendly refrigerant R404.
• Adopt UV and O3 sterilization for 30 minutes every time.
• Peltier specimen clamp refrigeration may be turned on or off manually.
• Two defrosting methods: manual and automatic.
• Two running ways: manual and automatic.
• Emergency stop function: Press the red button to stop running when any emergency happens.
• The high precision unit is enclosed outside the cryostat chamber to prevent it from thermal expansion and contraction, and keep minimum maintenance requirement .
• An artificial intelligent interface is easy for users to learn and operate.
• LCD screen can display all information including thickness, thickness sum, controlling time, temperature, timed on/off and so on.
• Sleep Function. After activating this function, the temperature in cryostat chamber can be kept between -1℃ and - 10℃; After stopping this function, the temperature in the freeze chamber will arrive at a working temperature within 30 minutes.
• Control panel with a locking function could avoid wrong operation.
• Handwheel locking function.
• Wide freezing shelf loads 8 specimen cassettes simultaneously, and two of them are equipped with a peltier to meet different temperatures.

Specifications

• Freeze chamber minimum temperature:  -35℃±2℃
• Freeze shelf minimum temperature: -45℃±5℃
• Lowest temperature of Peltier unit on freeze shelf：-55℃±5℃
• Lowest temperature of Peltier unit on Specimen Clamp：-50℃±5℃(working time of Peltier is 15 minutes.)
• Maximum specimen size：35×35mm
• Specimen vertical stroke：48±1mm
• Specimen horizontal stroke：15±0.2mm
• Coarse feeding speed：300μm/s (slow) or 900μm/s(rapid)
• Section thickness range： 

   0μm～100μm adjustable;   
   0μm～3μm, in 0.5μm increments; 
   3μm～10μm, in 1μm increments; 
  10μm～20μm, in 2μm increments;   
  20μm～100μm, in 5μm increments;                             

•  Trimming thickness range:

  10μm～600μm adjustable;
  10μm～50μm, in 5μm increments;
   50μm～100μm, in 10μm increments;
  100μm～600μm, in 50μm increments;

• Retraction range: 0~80μm adjustable, in 5μm increments
• Voltage and frequency：220 V ± 10% , 50 HZ / 110 V ± 10% , 60 HZ
• Nominal Power: 1000 W
• Weight: about 130 KG
• Dimensions(W×D×H)：805×715×1195mm