Freeze/Thaw Chambers – TH Series

The Freeze / Thaw TH series chambers are our state of the art freezer environmental chambers used for a variety of applications. Freeze-thaw chambers are excellent for customers requiring ramp/soak programming. Controls are able to be quickly exchanged for future upgrades or repair.

Darwin Freeze Thaw (TH) chambers allow you to determine if your product will remain stable under various conditions. During the freeze thaw cycle your product is put through a series of extreme temperature changes that it may encounter during its life cycle. Versatility with the chamber includes varying the freeze and thaw temperatures, duration in the freeze and thaw parts of a cycle, and overall number of cycles per day. These Freeze Thaw chambers are ideal for ASTM materials testing, as well as testing for drugs, food & beverage, and personal care products. They exceed ICH/FDA guidelines concerning uniformity requirements with a temperature range of -25°C to 50°C. Approximate ramping ability is as follows 1°C per 2 minutes from -23°C to +23°C and back, unloaded. Note: Some defrost tolerance may be required for extended operation (more than 48 hours) below 4°C.

The TH series allows for testing in accordance with the AASHTO T103 Test Method, Procedures A, B and C. Additionally, Darwin’s Freeze Thaw chambers allow for testing in accordance with the Iowa Department of Transportation Test Method 211-B.



The TH011 is a benchtop freeze thaw chamber.



The TH030 is a single-door freeze thaw chamber.



The TH034 is an extra wide single-door freeze thaw chamber.



The TH055 is a two-door freeze thaw chamber.



The TH084 is a three-door freeze thaw chamber.

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TH Series Features

TH Series

The TH series chambers are our state of the art freezer environmental chambers used for a variety of applications. Controls are able to be quickly exchanged for future upgrades or repair.

Greatly Reduced Direct and Indirect Energy Loads

The TH Series freezers utilize less energy than comparable freeze thaw chambers and introduce less impact upon building cooling systems. This efficiency “dual benefit” allows our chambers to be located in spaces unsuitable for other chambers.

Refrigeration System

The TH Series provides an oversized and balanced, environmentally friendly R404A refrigeration system, epoxy coated evaporator, large evaporator and coil heater permit for a short defrost cycle. Along with an automatic evaporator fan motor to delay frost during defrost.

Options Available

Data Logging
Chart Recorders
Touch Screen Control Interface

Widely Proven, Non-Proprietary Controllers

Standard controllers for the TH Series are manufactured by Fuji Electric and are ideal for laboratory freezer. Unlike many proprietary controllers, this controller is commercially available and proven in tens of thousands of installations. Standard functions include: autotuning, fuzzy logic, PID control, programmable alarms, calibration capability, ramp/soak, offset capability, etc. A touchscreen control interface is optional. Other controller manufacturers are also supported (Watlow, Allen-Bradley etc.)

Services and Warranties

We offer technical support throughout the lifetime of your freezer. In addition to standard warranties, we also offer extended warranties for cooling components, parts and labor. We also provide qualifications, validations and preventive maintenance services at an additional cost. Please ask for a quote.

Quiet Operation

The TH series freezers utilize quiet, highly efficient DC fans.