Thermo Scientific Forma™ Environmental Chambers 29 cu. ft. 208/220V - 3940

Broad Range of Features and Controls:

• Wide temperature range of 0° to 60°C that enhances the flexibility of the unit
• Relative humidity control via steam generator from above ambient to 95% at 37°C (not available w/Cat. No. 3920)
• Sophisticated digital controls
• Programmable ramp and soak cycles for temperature and RH†
• Durable cabinets with true laminar airflow through side plenums for extremely tight uniformity
• Phenolic-coated evaporator for use in applications that create corrosive byproducts
• Manual control of defrost and refrigeration cycles
• Visible/audible safety alarms alert to over- and undertemperature conditions, deviation of humidity from set parameters (except Model 3920)

Durable Construction:

• Cold-rolled steel, powder-coated cabinet
• 2? (5.1cm) thick, CFC-free, foamed-in-place polyurethane insulation
• Stainless-steel interior with solid stainless-steel adjustable shelves
• Directed horizontal airflow system for excellent uniformity
• Locking swivel casters for easy mobility during installation and cleaning
• Leveling feet for stability and added safety in the lab

Broad Range of Options:

• Interior lighting for Models 3920, 3940 and 3949 (Optional)
• Reinforced shelving and flooring for heavy loads
• Heatless dryer for lower humidity levels
• Access ports for probes, sensors
• Interior convenience receptacles
• CO₂ (IR sensor)
• 6? and 12? temperature chart recorder
• Other custom options available

Compatible with:

• Recorders (197075, 198036, 198039, 198042, 201144, 201145, 201146, 201147)
• Reach-In/Environmental Chamber Solid Stainless-steel Shelf (224139)
• Reach-In/Environmental Chamber Perforated Stainless-steel Shelf (224155)
• Reinforced Stainless-steel Shelf (224161)
• Fixed Reinforced Stainless-steel Shelf for two shakers (1900005)
• Stainless-steel Door Glass Cover, factory installed (190591)

Recommended for:

Ideal for growth, stability and shelf-life testing applications

Ordering Information

† Humidity controller available on 3940/3949, 3911/3913 only

• Capacity (English): 29 cu. ft.
• Capacity (Metric): 821.2L
• Voltage: 208/220V
• Hertz: 60Hz
• Height (English) Exterior: 88.5 in.
• Width (English) Exterior: 38 in.
• Depth (English) Exterior: 32 in.
• Height (Metric) Exterior: 224.8cm
• Width (Metric) Exterior: 96.5cm
• Depth (Metric) Exterior: 81.3cm
• Height (English) Interior: 60 in.
• Width (English) Interior: 31 in.
• Depth (English) Interior: 27 in.
• Height (Metric) Interior: 152.4cm
• Width (Metric) Interior: 78.7cm
• Depth (Metric) Interior: 68.6cm
• Cabinet Material: Cold-rolled steel, powder-coated cabinet
• Amperage: 15A
• Shelves: 6 supplied; 19 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
• Lighting: Interior Lighting
• 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
• Certifications/Compliance: ICH, FDA, TAPPI, ASTM™
• Capacity: 29 cu. ft., 821.2L
• Dimensions (D x W x H) Interior: 27 x 31 x 60 in. (68.6 x 78.7 x 152.4cm)
• Electrical Requirements: 208/220V 60Hz