Thermo Scientific 3920, 3940, 3911 User Manual
Thermo Scientific
Forma Environmental Chambers
Controlled Temperature Storage Solutions
Optimum uniformity
plus a wide temperature range
A Choice of Environmental Chambers
to Meet Your Specific Needs
From stability testing to cell culturing, CO2, RH, and refrigeration control
to temperature-only, and 11.0 to 29.0 cu. ft., Thermo Scientific™ Forma™
environmental chambers are built to last and will meet your needs now
and in the future.
If you require a high precision cabinet to meet ICH,
FDA, TAPPI, ASTM or national testing standards our
3920/3940/3911 Series is the ideal choice.
• Uniformity and a wide temperature range
for easy compliance with regulatory requirements
• Rugged construction and durable shelving designed for long life
• Broad range of options to create the perfect fit for
your applications
At-A-Glance Chamber Comparison
Thermo Scientific
Type
Stability
Cat. No. Temp Range Uniformity RH
3940 (3949) 0°C TO 60°C ±0.3°C @ 25°C to 37°C Above ambient to 95% @ 37°C 29.0 Optional Optional*
3920 0°C TO 60°C ±0.3°C @ 25°C to 37°C N/A 29.0 Optional Optional*
3911 (3913) 0°C TO 60°C ±0.3°C @ 25°C to 37°C Above ambient to 95% @ 37°C 11.0 Optional N/A
3960 (3961)
5°C above
ambient to 60°C
±0.4°C @ 30°C
±0.3°C @ 37°C
±0.5°C @ 45°C
Consider our Thermo Scientific 3960 Reach-In
Incubator/ Environmental Chamber if you are
focused on elevated temperature-only segments of
drug stability and culture.
• Optimum uniformity and an elevated temperature range for
easy compliance with regulatory requirements
• Rugged construction and durable shelving for long life
• Valuable features designed for flexibility and cost-effectiveness
Size
(Cu. Ft.) CO
N/A 29.0 N/A N/A
Lights
2
* Lights (Cat. No. See page 11) do not meet ICH guidelines.
2
Thermo Scientific 3920/3940/3911 Series Stability
Chambers for a Multitude of Applications
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.
Advantages of our directed horizontal
laminar airflow system
Our directed airflow system (shown below) 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. Even when filled with samples or
equipment, each shelf receives a consistent flow of
conditioned air for optimum temperature uniformity
and recovery.
As opposed to our horizontal airflow system, top-tobottom (non-directed) airflow systems use a topmounted fan to push air down through wire shelves.
Temperature uniformity and recovery can deteriorate
quickly when shelves are filled because air movement is
blocked. That variation in temperature, alone or when
combined with frequent door openings, may
compromise environmental conditions or make process
validation difficult.
Standard 4 to 20 milliamp output connects to most
alarm/monitoring systems, allowing you to meet
internal and regulatory product documentation
requirements. Chart recorders are also available.
The Thermo Scientific directed airflow design (left) versus a top-to-bottom, undirected
airflow design (right).
The directed airflow minimizes the risk of product desiccation and loss, and wasted
time and money due to poor temperature uniformity and recovery.
3
Main Power Switch
and Indicator
Humidity Controller
(3940/3949, 3911/3913) only)
Displays actual RH (%) and setpoint (Ramp and Soak)
Humidity Alarm and Indicator
(3940/3949, 3911/3913 only)
Indicates deviation of cabinet humidity from
set parameters
Temperature Controller
Displays actual chamber temperature and setpoint
(Ramp and Soak)
Over-temperature Safety Thermostat and Indicator
Set over-temp (alarm and light indicate over-temp condition)
Under-temperature
Safety Thermostat
and Indicator
Set under-temp control
(alarm and light indicate
under-temp condition)
Dehumidify and Humidify Switches and Indicators
(3940/3949, 3911/3913 only)
Control humidification and refrigeration systems, show cycle status
(dehumidify switch operates only with optional heatless dryer)
Rugged construction and durable
shelving for long life
• Exterior cabinet is 18 gauge cold-rolled steel, powder
coated for durability and a high quality appearance that
resists scratches and chipping.
• 2.0" (5.1cm) thick, non-CFC, foamed-in-place
polyurethane cabinet insulation provides maximum
product thermal protection and increased rigidity for
reliable daily use.
• Phenolic-coated evaporator protects against corrosive
by-products or agents in the chamber atmosphere
(e.g., secretions from insects such as flies), ensuring
long life.
• Solid, stainless steel interior is more durable and
corrosion-resistant than plastic or painted metal,
ensuring long life and minimizing equipment costs.
• Heavy-duty, solid, stainless steel shelves are easy-to-
clean, saving time and effort; more corrosion-resistant
than coated wire shelves for long life; and adjustable
for convenience.
• 29.0 cu. ft. models include 6 shelves that are
adjustable on 3.0" (7.6cm) centers.
• 11.0 cu. ft. model includes 3 shelves that are
adjustable on 2.0" (5.1cm) centers.
• Reinforced floor/shelf components for 29.0 cu. ft.
models are available so you can use shakers, cell
rollers, or other heavy equipment or product loads
inside the chamber to meet a variety of applications.
• Swivel, locking casters ensure easy mobility during
installation and cleaning. Leveling feet provide stability
and added safety in the lab.
Defrost and Refrigeration Switches and Indicators
Adjustable defrost timer is factory set for two 15 minute
defrost cycles during a 24 hour period
Broad range of options create a perfect fit for your applications
Many options are available so you can tailor this series to your specific applications.
Factory-installed options (ordered separately) include:
• Choice of access ports for inserting data logging sensors or cables.
• Convenience receptacles to run electrical devices in chamber.
• Choice of chart recorders for data logging.
• Choice of data outputs for monitoring/alarm (3960 / 3961 models only).
• Infrared CO2 Control Package for control of a CO2 environment.
• Heatless dryer for low humidity conditions – check temperature / humidity chart (see page 5).
• Door light package for plant growth, seed germination, algae, small animal, insect studies.
• Stainless steel door glass for light sensitive applications.
• Door options include door lock, left-hand door, and Lexan™ inner door.
• Choice of shaker support systems provides system safety.
• Temperature mapping and calibration certificate – customized.
Accessories/on-site options (ordered separately) include:
• Extra and special shelving.
• Reinforced floor options for heavy weights – up to 150 lb.
• Sensaphone™ telephone dialing systems – interfaces with standard touch-tone phone.
• Cell roll system for production of monolayer cell cultures (see page 7).
• On site IQ/OQ/PQ validation services.
Options for the humidity system:
• Condensate pump kit: recommended when the accessible drain on lab wall is well above the
drain on back of environmental chamber.
• Condensate evaporator: external heating device which burns off water that drips out the back
of the unit when there is no drain available.
4
See page 11 for order numbers, model compatibility and additional information.
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