Controlled-Rate Freezer, CYTO Sensei

Cell Freezer
  • Maintain high cell viability

  • Liquid nitrogen-free

  • Customizable freeze blocks

  • Portable

The Controlled-Rate Freezer, CYTO Sensei, is a system that can cryopreserve your cells and maintain high cellular viability. The compact benchtop system is simply plugged into a standard wall outlet and connected to a designated laptop via a USB cable. Then it is ready to start without using liquid nitrogen. A custom freezing protocol can be easily programmed with the included software. Cell samples are then loaded into the custom aluminum freezer block (able to accommodate vials, vial racks, plates, straws, or cryo bags) within the system and are then ready for cryopreservation. The powerful Stirling engine cools the cells to the lowest of -80°C without the use of liquid nitrogen. Readings from 3 temperature sensors within the CYTO Sensei are automatically recorded in an available PDF report. You can transfer the samples to cold storage, such as a deep freezer. A built-in heater restores the freeze block to room temperature in preparation for the next cell cryopreservation protocol, increasing cryogenic storage throughput.

Overview of the Strex Cell Controlled-Rate Freezer

How to create a freezing protocol

  • Controlled-Rate Freezing
    Maintain high cell viability with this unique freezer. Cryopreservation is optimized because of the programmable controlled freezing rate this system is capable of. A very user-friendly interface allows custom freezing protocols to be programmed and cells to be preserved immediately. Simply program, place your vials, and preserve.
  • Liquid Nitrogen Free
    Always be ready to preserve your cells and enjoy extremely low running costs thanks to the strong Stirling Cooler within the CytoSensei. Liquid Nitrogen will not be necessary with the CytoSensei system. The freedom from Liquid Nitrogen allows more resources and effort to be focused on the cells and tests in the lab. Scheduling and paying for Liquid Nitrogen deliveries each week will not be part of your efficient cryopreservation work in the lab with the CytoSensei.
  • Portable
    Many freezers require a moving team to relocate and a large space to house. The CytoSensei occupies minimal floor or bench space, despite its strong cryopreservation performance. The standard system also weighs in at only 12.7 kgs  (27.9 lbs) and is outfitted with a large handle to ease portability. Movement of the system to a collaborator’s lab or into the field allows diverse applications for cryopreservation needs.
  • Customizable Freeze Blocks
    Efficient heat transfer is essential for effective cell cryopreservation. Our systems are outfitted with freeze blocks machined to the users’ exact vial size and type to achieve this. Other models of the CytoSensei use an ethanol bath that an entire vial rack (or 2) can fit within to increase throughput.

Examples of Freezing Blocks

pr1Blood Bags with Cassette
Total capacity: 50 mL
plate1Cryovials & Plates for Straws
plate2Cryovials (2 mL x 55 pcs)
Sample volume per vial: 1.0 mL

Lowest Temperature-80°C
PowerAC 100-240 V/50-60 Hz
Temperature ControlPID Control
Refrigeration UnitStirling Cooler
External SizeH 16″ x W 12.5″ x D 8.5″ (excluding handle)
Number of Housing Blocks1
Communication PortRS232C (Freezer) USB (PC)
Electric Consumption200 W
Weight12.7 kg
Required AttachmentsLaptop Computer
  • iPS and ES cells
  • Cord blood storage
  • Immuno Oncology (T-cells)
  • Biobank storage
  • Livestock IVF

Strex products are for research purposes only.

The CytoSensei Programmable Cell Freezer has a capacity of about 50 mL volume or 55 cryogenic vials (0.5-2 mL size) with up to 1 mL fill volume. We can configure it to work with a 96 well plate format.

Custom sizes are available. Please contact us today for more information on how we can customize your needs.

Cryopreserved Cell Defroster (YS Series)

Portable dry bath with a custom block for safe and effective defrosting of cryopreserved cells in CPC or clean bench. Simply place cryopreserved sample tubes in the unit’s liquid-free block to enable high reproducibility and reduce contamination risk.

YS-1. Accommodates 4 standard cryotubes.
Warming block customizable upon request.

YS-W. For larger volume vials and quantities of vials.


  • Liquid Free
    Reduce water bath contamination risk
  • Easy Operation
    Simply place sample vials in the block for consistent results
  • Compact Design
    Fits in small spaces (CPC/Clean Bench)
  • Custom Block Option
    Customize defrosting block to accommodate specific vial model
  • Validation Ready
    Equipped with temperature validation port
DimensionsYS-1 – 105 (W) x 235 (D) x 85 (H) mm
YS-W – 160 (W) x 240 (D) x 130 (H) mm
(without posturing)
Power SupplyAC100 ~ 240V 50/60Hz

Customizable Defrosting Block

*Custom blocks created to fit particular make and model vials

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