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E-mail
shjuyigs@163.com
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Phone
15021203562
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Address
Tingfeng Road, Zhujing Town, Jinshan District, Shanghai
Shanghai Juyi Environmental Testing Equipment Co., Ltd
Understanding the functional characteristics of each component of the high and low temperature alternating humidity test chamber is essential for better use
Date: 2025-11-17Read: 0
The high and low temperature alternating humidity test chamber is a key equipment for simulating climate environments and evaluating the reliability of products under sudden temperature changes and high humidity conditions. It is widely used in fields such as electronics, automotive, military, materials, and medical equipment. The high-low temperature alternating humidity test chamber can accurately reproduce complex environmental cycles ranging from -70 ℃ to+150 ℃ and 10% -98% RH, relying on the collaborative operation of multiple high-precision functional modules.
1. Refrigeration system
Adopting a cascade compressor for refrigeration (high temperature stage+low temperature stage), combined with environmentally friendly refrigerants (such as R404A/R23), to achieve rapid cooling and ultra-low temperature stable control. Equipped with electronic expansion valves to accurately regulate refrigerant flow, ensuring temperature fluctuations of ≤± 0.5 ℃, meeting strict standards such as GJB and IEC.
2. Heating and humidification system
Heating: Stainless steel finned electric heating tubes are distributed in the air duct, with PID control of heating rate (usually 1-5 ℃/min) to avoid local overheating;
Humidification: Using electrode or electric heating steam generators to generate clean saturated steam, with humidity control accuracy of ± 2% RH; some models are equipped with dry wet bulb sensors to dynamically compensate for environmental deviations.
3. Wind circulation system
The centrifugal fan drives forced convection, combined with porous air distribution plates and adjustable guide vanes, to ensure a temperature and humidity uniformity of ≤± 2 ℃/± 3% RH inside the box. The adjustable wind speed design takes into account the requirements of fast temperature change rate and undisturbed sample surface.
4. Control system
Embedded industrial PLC or ARM processor is equipped with professional environment simulation software, supporting programming multi-stage cycles (such as high temperature and high humidity → low temperature and low humidity → cold and hot shock), and can store hundreds of programs. The 7-inch touch screen displays real-time curves and has USB data export, remote monitoring (RS485/Ethernet), and fault self diagnosis functions.
5. Box structure and sealing
Inner liner: SUS304 stainless steel mirror panel, corrosion-resistant and easy to clean;
Shell: Cold rolled steel plate spray painted, beautiful and durable;
Insulation layer: Polyurethane foam with a thickness of over 100mm, low thermal conductivity, energy-saving and efficient;
Sealing: Double layer high and low temperature resistant silicone door seal, combined with a pressure balancing device, to prevent difficulty in opening the door or moisture leakage.