Thermo Scientific 3951 Incubator 29-cu ft | 821.2L

  • 200/230 volts, 50/60 hertz — Brand-New from Thermo Scientific + Ready to Ship² from our Cross-Dock Location


  • Culture large volumes of patient samples for bacterial growth, perform short-term growth studies and work with large volume products.
  • The Thermo Scientific Large-Capacity Reach-In CO2 Incubator offers a broad range of built-in features that provide optimal flexibility.
  • This unit provides elevated RH to prevent product desiccation in medium-term cultures and maintains temperature uniformity, even when equipment (cell rollers, rockers, shakers, spinners, stirrers) is installed in the chamber.

Direct Heat Chamber

  • Larger 821L (29 cu. ft.) capacity easily accommodates shakers, stirrers, roller bottles, and other related equipment for high throughput applications.
  • Direct horizontal laminar airflow system is designed to promote the ideal growth environment.
  • Heated triple-pane glass door minimizes condensation and permits a clear view.
  • Two thru-wall access ports (on right and left sidewalls) allow addition of probes, sensors, and power cords.
  • Polished stainless steel interior and heavy-duty, solid stainless steel shelves are easy- to-clean and corrosion resistant.
  • Interior and exterior accessory receptacles provide a convenient power source.
  • Swivel locking casters ensure easy mobility for installation and cleaning.

In situ Sensors and Probes Designed for Precise Monitoring

  • TC (thermal conductivity) CO2 sensor for long, reliable operation.
  • Dual temperature probes with over temperature protection.

Flexible, Easy-to-Use rH system

  • 3 rH system settings: off, medium, high.
  • 3 water fill options: automatic, semi-automatic, ergonomic manual.

Enviro-Scan Microprocessor Control

  • Easy-to-use, alphanumeric LED display.
  • Flexible, intuitive controls with message center including process and alarm status messages.
  • Configurable audible on/off, access code, tracking low and high alarms.


Product Size Each
Chamber Material Polished stainless steel
CO2 Concentration Range 0 to 20%
CO2 Sensor Technology TC sensor
Oxygen Control Not Available
Humidity Delivery 15L integrated humidity reservoir
Relative Humidity Off, med. >80%, high >90%
Temperature Range (Metric) Ambient +5° to 50°C
Data Outputs Optional 4-20mA
Certifications/Compliance CE, UL, cUL
Dimensions (D x W x H) Interior 27 x 31 x 60 in. (68.5 x 78.7 x 152.4cm)
Capacity 29 cu. ft., 821L
Electrical Requirements 200/230V 50/60Hz
Dimensions (L x W x H) Exterior 33 x 38 x 80 in. (83.8 x 96.5 x 203.2cm)
Description Single 821L incubator
Net Weight 500 lb, 226.8kg


Model CO2 Sensor Technology Capacity Electrical
3950 TC Sensor 29 cu. ft., 66L 120V 60Hz
3951 TC Sensor 29 cu. ft., 66L 200/230V 50/60Hz


Thermo Scientific Large-Capacity Reach-In CO2 Incubators Product Brochure

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