Current Inventory > Environmental Chambers

Stock Number: JMS0377
Manufacturer: Thermo Scientific
Model: Forma 3911 11 Cubic Foot Benchtop Environmental Chamber
Price: inquire


  • Thermo 3911 Environmental Chamber
  • Manual & Power Cord
  • Parts & Labor Warranty




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This series of environmental chambers meets International Conference on Harmonization (ICH) guidelines for drug substance and product storage testing. The units are ideal for drug stability studies, shelf life testing for packaged products, and insect and other large-scale biological research. Optimum uniformity and a wide temperature range for easy compliance with regulatory requirements These chambers feature a 0°C to 60°C (32°F to 140°F) temperature range that can be set in 0.1°C increments. The broad temperature range, and optimum temperature uniformity and recovery contribute to an ideal test environment, even when the chamber contains large product loads and low output, heat-generating equipment.

  • Capacity (English)     11 cu. ft.
  • Capacity (Metric)     311.5L
  • Voltage     208/220V
  • Hertz     60Hz
  • Height (English) Exterior     51.5 in.
  • Width (English) Exterior     38 in.
  • Depth (English) Exterior     32 in.
  • Height (Metric) Exterior     130.8cm
  • Width (Metric) Exterior     96.5cm
  • Depth (Metric) Exterior     81.3cm
  • Height (English) Interior     24 in.
  • Width (English) Interior     31 in.
  • Depth (English) Interior     27 in.
  • Height (Metric) Interior     60.9cm
  • Width (Metric) Interior     78.7cm
  • Depth (Metric) Interior     68.6cm
  • Cabinet Material     Cold-rolled steel, powder-coated cabinet
  • Amperage     15A
  • Shelves     3 supplied; 11 max.
  • Display     Digital dual LED
  • Programmability     Temperature ramp and soak, up to 24 steps
  • Temperature Range (Metric)     0° to 60°C
  • Temperature Resolution     0.1°C
  • Temperature Uniformity     ±0.3 at 25° to 37°C
  • Temperature Sensor     RTD
  • Temperature Accuracy     ±0.1 at 25° to 37°C
  • Compressor     1/4hp, air-cooled
  • Relative Humidity     Relative humidity control via steam generator from above ambient to 95% at 37°C
  • Heat Output     1750W (6000 BTU/hr.) at 220V, 1600W (5500BTUH) at
  • Humidity Accuracy     ±5.0%
  • Humidity Control     Microprocessor, PID
  • Humidity Display     Digital, dual LED (direct set and read in % RH)
  • Humidity Range     Above ambient to 95% at 37°C (98.6°F)
  • Humidity Resolution     0.01
  • Humidity Sensor     Bulk polymer
  • Humidity Source     Steam generator; initial fill approx. 1 qt. (1L)
  • Input Water Pressure     Water Inlet Gravity to 40psi
  • Water Resistivity     50kilohm to 1megohm resistance
  • Defrost     Adjustable defrost timer; factory set for two 15-min. defrost cycles/24 hr.
  • Refrigerant     CFC-free, R134A
  • Water Consumption     0.25 gal./hr. input water volume