Description
Thermo Forma Environmental Chamber Model 3920
The Thermo Forma Environmental Chamber Model 3920 features 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.
Thermo 3920 units are ideal for drug stability studies, shelf-life testing for packaged products, and insect and other large-scale biological research.
Thermo Forma Environmental Chamber Model 3920 features
- Capacity: 29 Cubic Feet
- Temp range: 0°C to 60°C
- 90-day warranty
The Thermo Scientific Directed Airflow System promotes an ideal growth environment. The enhanced design includes a positive pressure feed plenum on the right side of the chamber and a negative pressure return plenum on the left to distribute the airflow uniformly throughout the chamber.
This combination directs air across the surface of each solid shelf. Each shelf receives a consistent flow of conditioned air for optimum temperature uniformity and recovery. As opposed to a horizontal airflow system, top-to-bottom (non-directed) airflow systems use a top-mounted fan to push air down through wire shelves.
The Thermo Forma 3920 features a temperature controller that displays the actual temperature and the setpoints for ramp and soak. Over-temperature and under-temperature safety thermostat and indicator that sets temp conditions (alarm and light indicate over-temp condition).
Also included are standard access ports for data logging. Defrost and refrigeration switches and indicators with the adjustable defrost timer factory set for two 15-minute defrost cycles during a 24-hour period. Solid door that is heated for reduced condensation.
CLICK HERE to see the Thermo Forma 3920 Refrigerated Incubator on our YouTube channel
Testing
This incubator is used and reconditioned. All of our incubators are used and reconditioned. We test incubators using a calibrated digital chart recorder to verify the accuracy of temperature controls and readouts. We replace any hardware or parts as is necessary and clean all incubators thoroughly prior to shipment.
Pictures
The photos above are representative. The equipment shown is currently in storage in our warehouse. In addition to testing each machine we will clean all the equipment thoroughly prior to shipment.
We often have multiple units of each model in stock and sometimes we’re unable to feature photos of every single unit. At your request, we can provide photos of the equipment in your order after it has been tested and cleaned.
Thermo Forma Environmental Chamber Model 3920 features – specifications
| External dimensions | 38”W x 32”D x 87.5”H |
| Interior dimensions | 31”W x 27”D x 60”H |
| Capacity | 29 cu.ft. |
| Temperature range | 0° to 60°C |
| Electrical requirements | 120V, 60Hz, 16A |
| Weight | 700 lbs |
For inquiries about the Thermo Forma 3920 Refrigerated Incubator, please give us a call at 978-521-2221, or fill out the form on this page.
Thermo Forma 3920 Refrigerated Incubator (Solid Door) Frequently Asked Questions
What are some typical applications for the Thermo 3920?
Large capacity refrigerated incubators are used in various studies that require controlled environmental experiments. Typical applications for units like the Thermo 3920 include:
- Pharmaceutical drug stability studies
- Shelf-life testing of packaged goods
- Microbiology and biological research
- Insect and entomology studies
Does the incubator have programmable temperature control?
Yes. The Watlow microprocessor control system on the Thermo 3920 supports programmable ramp and soak temperature cycles. This allows users to program the chamber to automatically change temperatures over set periods of time for complex testing protocols.
Does the Thermo 3920 incubator feature humidity control, or just temperature?
The standard Model 3920 does not include humidity control. Other environmental chamber models in the same series may support humidity regulation via a steam generator, but that feature is not available on this specific model. If you need a chamber with humidity control we suggest looking at the Thermo 3940, or contacting our sales team for other options.
What refrigerant does the Thermo 3920 system use?
The refrigeration system typically uses CFC-free R134a refrigerant with an air-cooled compressor to maintain temperatures below ambient conditions.
How many shelves does the Thermo 3920 hold? Does American Instrument Exchange sell additional shelves?
The chamber generally includes multiple stainless-steel shelves, with configurations allowing up to about 19 shelves depending on spacing and accessories. We usually included four to five shelves. If you need additional shelves, please speak with our sales team about options.
How does the airflow system in the Thermo 3920 work?
The chamber uses a directed airflow system through side plenums to distribute conditioned air evenly across each shelf. This design improves temperature uniformity and recovery after door openings, ensuring consistent environmental conditions throughout the chamber.
Does the Thermo 3920 incubator include access ports?
Yes. Many configurations include access ports on the sides of the chamber for probes, sensors, or instrumentation cables used in monitoring experiments. If you’re looking for a specific port configuration, or want to make sure the port configuration will support the application you have in mind, please speak with an American Instrument Exchange sales rep.
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