Alltest ACW-904 Panel Walk-In (Thermotron WP-904)

The Alltest ACW-904 Panel Walk-In is a large-capacity environmental test chamber engineered for temperature and humidity simulation across semiconductor, flat panel display, and solar cell manufacturing. Built from lightweight insulated panels with cam action speed locks and embedded steel straps, this 904 cubic foot chamber delivers controlled environments from −68°C to 85°C (cascade) with humidity control from 5% to 95% RH. The Thermotron 8800 Controller with 12-inch color touchscreen provides intuitive operation, multi-level security, data export, and 15+ years of activity logging via Ethernet and web access.

– Technical Specifications

Workspace Dimensions
• Width: 108 inches (274 cm)
• Depth: 154 inches (391 cm)
• Height: 94 inches (239 cm)
• Volume: 904 cubic feet (25,601 liters)

Temperature Performance
• Single Stage: −34°C to 85°C (−29°F to 185°F)
• Cascade: −68°C to 85°C (−90°F to 185°F)

Humidity Control
• Standard: 20% to 95% RH (dewpoint 5°C to 65°C, dry bulb ≤70°C)
• Optional Low Humidity: 5% to 95% RH (dewpoint −10°C to 65°C, dry bulb 5°C to 70°C)

Control & Data
• Thermotron 8800 Controller with 12-inch color touchscreen
• Password-based multi-level security
• Spreadsheet-compatible test data export
• Activity log: 15+ years retention
• Ethernet and web-enabled access

Construction
• Interior finish: Stainless steel or aluminum
• Floor capacity: 600 lbs per square foot
• Installation requirement: Level floor (≤1/8 inch per 10 feet)

– Key Features

• Single-stage or cascade refrigeration selection
• Cam action speed locks with embedded steel reinforcement
• Lightweight panel construction for straightforward assembly
• Air-cooled condensers

– Optional Capabilities

• Chamber Data Acquisition (DAQ)
• Door interlocks
• Electronic humidity sensor
• Product Temperature Control (PTC) — exceeds standard conditioning rates
• Reinforced floors and shelving
• Water purification and recirculation system
• Access ports: 3, 4, 5, 6, or 8 inches
• Dry air purge for low-temperature moisture reduction
• Custom color finishes

– Typical Applications

Semiconductor component qualification, flat panel display durability testing, and solar cell environmental validation.