Technical Principles and System Architecture of High- and Low-Temperature Test Chambers
2026-05-12
Refrigeration system
Cascade refrigeration cycle: For temperatures below −40°C, a two-stage compression or three‑stage cascade configuration is employed, utilizing R404A (a medium‑temperature refrigerant) in combination with R23 (a low‑temperature refrigerant), to ensure stable performance at cryogenic levels.
Cooling rate: 0.7–1.2 °C/min; temperature fluctuation under no-load operation ≤ ±0.5 °C; uniformity ≤ ±2 °C.
Heating system
Far-infrared nickel-alloy high-speed heater: 2 kW × 2, heating rate of 1.0–3.0 °C/min, with independent high-temperature control to prevent mutual interference during alternating tests.
Control system
Imported microcomputer‑based integrated temperature and humidity controller: employs a P.I.D. + S.S.R. coordinated control system, with an accuracy of ±0.1 °C, supports 120 programs and 12,000 steps of memory storage, and features automatic calculation and correction functions.
Human–Machine Interaction: 7-inch HD touchscreen, supports switching between Chinese and English, real-time curve display, and historical data playback (with the ability to store up to 600 days of data).
Enclosure structure
Inner liner: SUS304 stainless steel, offering excellent corrosion resistance; outer shell: A3 steel plate with a painted finish, aesthetically pleasing and easy to clean.
Insulation layer: 100 mm thick ultra-fine glass fiber wool, designed to minimize heat loss.
Observation Window: Multi-layer vacuum‑tempered glass with a built-in conductive film, allowing clear visualization of the testing process.
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