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HD-596-12 Environmental Testing Chamber
Illustration of man next to  for scale
 Environmental Testing Chamber
Illustration of man next to  for scale



High Performance icon

HD-596 Models are available in multiple performance levels giving you the rise and pull-down rates you need to meet test requirements and manage live load testing. Built on swivel brake casters, this floor-style environmental test chamber with temperature and humidity functionality still offers flexibility in your lab space or on the production floor.  

All large floor models, over 13 cubic feet, are available with escalating performance speeds, for more rate information see specifications below.

STRUCTURE.  The exterior cabinet design is an engineered sheet metal frame that is precision laser cut and formed with powder coat bone color and matte finish.

The internal workspace walls are type 304 stainless steel for vapor-tight internal construction. The exterior has a durable powder-coat finish over heavy-gauge steel for a long-lasting clean look. And between the two layers, you’ll find highly efficient, low k-factor thermal insulation. This chamber is built to last for many years.

CIRCULATION SYSTEM.  Air circulation is crucial for environmental testing. The airflow system has a proprietary baffle/fan design combination to optimize temperature and humidity conditions within the workspace. Air flows into a plenum behind the back wall of the internal workspace for conditioning to the required setpoint. Pushed by large stainless steel blower wheels, air enters the workspace through a four-inch area at the top of the workspace’s back wall. A directional baffle forces the conditioned air across the ceiling toward the front door, redirecting and dispersing the airflow throughout the workspace. An intake vent on the workspace floor along the back wall returns air to the plenum for reconditioning to the precise temperature and humidity. 

Variable-speed airflow control is included allowing you to adjust airflow to meet your test requirements and reduce noise.


HEATING SYSTEM.  HD test chambers feature heating systems equipped with several finned nichrome sheath bars that operate independently within the plenum for reliable and accurate temperature control within ±0.5°C.

HUMIDITY SYSTEM.  The humidity system has a standard range between 10% and 95%. To extend your humidity range, see the optional features section. View RH Chart.   

COOLING SYSTEM. The cooling system in the HD Series consists of a self-contained, compact, single-stage, mechanical refrigeration system with an air-cooled condenser. An optional water cooling condenser is available.

Add boost cooling with liquid LN2 or CO2 to shorten pull-down times; it's a great option for stress tests that require rapid cooling.

INSTRUMENTATION.  HD Series Test Chambers have incorporated AESONE CONNECT, creating a robust connected device for a standard and uniform interface, making monitoring and operating easier. See the Instrumentation Tab below for more details.

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  • Specifications
  • Standard Features
  • Instrumentation
  • Safety Features
  • Optional Features
  • Downloads
  • Dew Point Calculator


Interior: 48W x 72D x 48H (in)
  1219.1W x 1828.8D x 1219.1H (mm)
Exterior: 61W x 116D x 94H (in)
  1549.4W x 2946.4D x 2387.6H (mm)
Volume: 96 cubic ft
  2718.41 liters
Temperature: -40°C to 180°C (-37°F to 356°F)
Humidity: 10-95% RH, limited by +4°C Td (for 98% add option)
Humidity Fluctuation: ±2% RH at sensor
Rise Rate*: 5°C/min
Pull Down Rate*: 4.25°C/min
Electrical Supply:  480 VAC, 3 PH, 60 HZ
Facility Power Receptacle: Hardwired
Refrigeration System:  Single stage
Approximate Product Weight: 5115 lbs (2320 kg) without added options
Approximate Shipping Weight: 5225 lbs (2370 kg) without added options

Standard Performance

Temperature Only -40° C to +180° C
Temperature & Humidity -40° C to +180° C

ModelWorking VolumeExterior
18.0 cu ft (509.73 l)
Interior: 36x24x36 in
49x60x82 in
27.0 cu ft (764.81 l)
Interior: 36x36x36 in
49x72x82 in
36.0 cu ft (1,019.46 l)
Interior: 36x48x36 in
49x84x82 in
48.0 cu ft (1,358.91 l)
Interior: 48x36x48 in
61x80x94 in
64.0 cu ft (22,251.4 l)
Interior: 48x48x48 in
61x92x94 in
80.0 cu ft (27,019 l)
Interior: 48x60x48 in
61x104x94 in
96.0 cu ft (31,788.5 l)
Interior: 48x72x48 in
61x116x94 in

Rate of Change Key
Thrust: up to 3.9°C/min
Impulse: up to 4.0°C/min
Warp: up to 6.5°C/min
Hyperdrive: up to 9.0°C/min

4HP Single Stage
7.5HP Single Stage
12HP Single Stage
Scroll or Discus
17HP Single Stage
↓ 4.5°C/min
↑ 6.0°C/min
↓ 6.75°C/min
↑ 8.5°C/min

↓ 3.75°C/min
↑ 5.5°C/min
↓ 6.5°C/min
↑ 8.25°C/min

↓ 3.0°C/min
↑ 5.0°C/min
↓ 6.0°C/min
↑ 7.0°C/min

↓ 2.5°C/min
↑ 4.75°C/min
↓ 5.0°C/min
↑ 7.0°C/min
↓ 6.0°C/min
↑ 7.5°C/min
↓ 8.0°C/min
↑ 9.0°C/min
↓ 2.0°C/min
↑ 4.0°C/min
↓ 4.75°C/min
↑ 6.0°C/min
↓ 5.25°C/min
↑ 6.5°C/min
↓ 7.5°C/min
↑ 8.0°C/min
↓ 1.5°C/min
↑ 3.5°C/min
↓ 4.0°C/min
↑ 4.5°C/min
↓ 4.5°C/min
↑ 5.0°C/min
↓ 6.5°C/min
↑ 6.5°C/min
↓ 1.5°C/min
↑ 3.5°C/min
↓ 3.5°C/min
↑ 4.5°C/min
↓ 4.25°C/min
↑ 5.0°C/min
↓ 6.0°C/min
↑ 6.5°C/min

Water-Cooled or Remote Air-Cooled
Remote Condensing

Remote Air-Cooled
Remote Condensing
(Scroll Only)

Remote Air-Cooled

*Rise and pull-down rates calculated using IEC 60068-3-5 standard. Custom options available.

*Ideal ambient temperature conditions for test chambers is 23°C (73.4°F). The temperature and humidity range of assured performance is between 15°C and 25°C (59°F/77°F) and 30-50% relative humidity. Conditions outside this range may affect the performance of your test chamber and reduce the lifespan of the equipment.

Standard Features


  • Temperature range: -40°C to 180°C (-40°F to 356°F)
  • Exterior structure is engineered sheet metal frame is precision laser cut and formed with powder coat bone color and matte finish
  • Interior cabinet is stainless steel, type 304
  • Interior light with exterior switch on cabinet face and AESONE CONNECT
  • Door mount controls
  • Electrical component cabinet is easily accessible via the front face with under door access
  • Exceptionally small clearance requirements, 12 inches in the back and 8 inches on each side
  • Compressor intake is front facing with outtake being expelled on left, right, and back sides (air-cooled chambers may require additional clearance based on the facility’s HVAC system recovery speed) 
  • Forced air circulation
  • Gas purge control, compatible with desiccant air dryer and GN2
  • Finned independent nichrome sheath heaters for even heating of conditioned air in the plenum offer fast changing heating and cooling rates
  • Powerful custom-designed stainless steel blower wheels
  • Port configuration: left and right wall access port and plug with 6 inch (152.4 mm) diameter
  • Fully-adjustable shelf, one wire-grid, stainless steel shelf
  • Full opening door with adjustable manual door latch
  • Swivel brake casters
  • Multipane heated 36 x 48 inch viewing window 



CONTROLLER   AESONE CONNECT allows for secure remote access to your test chamber and gives easy profile creation, operational control, and data management.

HD Series Test Chambers have incorporated AESONE CONNECT creating a robust connected device for a standard and uniform interface making test chamber operation easier.

AESONE XCHANGE is hardware internal to the chamber that increases your functionality

  • Connects the test chamber controller to your network for increased accessibility
  • On-board multi-year data logging

AESONE SOFTWARE gives you the power to

  • Remote chamber operation and monitoring, 
  • Web-based test profile creation, 
  • Viewing current data and historical data visually
  • Secure multi-level user access 


WATLOW F4T PROGRAMMABLE CONTROLLER. Features a 4.3” capacitive touchscreen minimizing the chance for error and the low voltage PLC is touch-safe. Ethernet communication supported by AESONE HARDWARE. View more controller options

AIRFLOW. Variable frequency drive allows you to lower air velocity to meet your test requirements and reduce noise.


  • TEMPERATURE SENSOR. Measured at the point of airflow entering the workspace. Class A, 3-wire, 100 Ohm Platinum RTD sensor
  • RELATIVE HUMIDITY SENSOR. Measured at the point of airflow entering the workspace. Speed of airflow does not affect measurement. Sensor is highly accurate between 10-95% RH, over the entire temperature operating range of -40°C to +180°C (-40°F to +356°F)
  • View sensor options

OPTIONAL DATA LOGGERS. View additional data loggers

Safety Features


  • HIGH/LOW TEMPERATURE CONTROL. An adjustable temperature limit controller allows you to program the highest lowest temperature the device under test, protecting products from compromising temperature exposure.
  • Internal high-temperature limit safety
  • Refrigeration system over-pressure safety circuit
  • Low-water steam generator over-temperature circuit
  • TUV Rheinland certified meeting UL 508A, US, C, E

Optional Features

  • Shelf Modification
  • Custom Porting Sizes
  • Custom window size
  • Noise Reduction Package
  • LN2 Boost Cool
  • CO2 Boost Cool
  • Water Cooled Condenser
  • Self-Contained Water Recirculating System
  • Water Demineralizer Cartridge System
  • High Humidity Sensor to extend the humidity range up to 98% RH
  • Desiccant Air Dryer to reach conditions as low as 5% RH 
  • Dry Nitrogen Purge to keep condensation and frost from accumulating on DUT surfaces at cold temperatures and to prevent oxidation of metals surfaces at high temperatures


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