Qualmark HALT testing (Highly Accelerated Life Test) chambers combine extreme temperature cycling and repetitive shock/vibration for the ultimate in accelerated reliability testing.

The technology has matured from a simple thermal shock chamber with a vibration table and independent controls to an integrated HALT/HASS system. Qualmark chambers have consistently been the market leader since introducing the technology in the early 1990s. Today, our technology continues to reflect the best advances in HALT/HASS testing.

Our models are the most energy efficient on the market. The technology provides the extreme stresses necessary to rapidly find design flaws missed by traditional methods.

The Omni-Axial six-degree-of-freedom, random, broadband excitation (10 Hz to above 5,000Hz) delivers a consistent power spectral density profile that eliminates "picket fencing." The thermal system features vacuum-jacketed liquid nitrogen cooling and nichrome wire heating, resulting in ramp rates of 60-100˚C per minute.

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Features for Thermal-only HALT

Cooling System

  • Vacuum Jacketed (VJ) liquid nitrogen (LN2) valves and manifold. (VJ manifold optional on TT2.0 models)
  • Proportional control and valve system for maximum LN2 efficiency and consistent temperature control, while reducing two-phase (gas/liquid) states that cause problems in traditional on/off solenoid-based control. 
  • VJ eliminates condensation, dripping water, OSHA safety concerns, and energy loss compared to other insulation methods.
  • Efficient, economical LN2 usage with either low-pressure Dewar tanks or higher pressure Permacyl and LN2 bulk tank systems.

Chamber Design

  • Stainless steel interior, painted exterior with two full opening doors (one door on TT2.0 models)
  • High-velocity airflow for improved product temperature change rates.
  • Adjustable feet for leveling unit (stand options for TT2.5/3.0 models)

Control System

  • Windows 10 system with Labview based operation and PLC-based controls
  • Programming, operation, and datalogging for thermal profiles.
  • Two thermocouples: one for product, one for air (four additional inputs available)
  • Eight event relays for external controls
  • Optional Q-Link or Qualview software tools for ATE integration and other remote connections.
  • Optional integrated spectrum analyzers and data acquisition systems.
Model Number Interior Dimensions
(W x D x H)
Interior Volume Temperature Range Change Rate
(heat/cool)
Notes
TT2.0 27" x 27" x 19.5" 8.2 cu. ft. -100 to 200°C up to 70°C/min. Table size: 24" x 24" (610 x 610mm);
5 actuators
TT3.0 44" x 45" x 35" 40.1 cu. ft. -100 to 200°C up to 70°C/min. Table size: 36" x 36" (914 x 914mm);
10 actuators
TT4.0+ 53.8" x 54" x 53.6" 90.1 cu. ft. -100 to 200°C up to 70°C/min. Table size: 48" x 48" (1220 x 1220mm);
12 actuators
TT4.0+ Inferno 53.8" x 54" x 53.6" 90.1 cu. ft. -100 to 250°C up to 70°C/min. Table size: 48" x 48" (1220 x 1220mm);
12 actuators
TT8.0+ 108.7" x 53.8" x 53.6" 181.4 cu. ft. -100 to 200°C up to 70-100°C/min. Table size: 100" x 48" (2540 x 1220mm);
24 actuators
TT2.5+ 35" x 35" x 35" 24.8 cu. ft. -100 to 200°C up to 70-100°C/min. Table size: 30" x 30" (762 x 762mm);
8 actuators
TT2.5+ Inferno 35" x 35" x 35" 24.8 cu. ft. -100 to 250°C up to 70-100°C/min. Table size: 30" x 30" (762 x 762mm);
8 actuators

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