Constant temperature and humidity testing machine, also known as environmental testing machine, tests the heat resistance, cold resistance, dry resistance and moisture resistance of various materials. It is suitable for quality control in electronics, electrical appliances, food, vehicles, metals, chemicals, building materials and other factories. 【Relevant Standards】

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【Scope of application】: Constant temperature and humidity testing machine, also known as environmental testing machine, tests the heat resistance, cold resistance, dry resistance and moisture resistance of various materials. It is suitable for quality control in electronics, electrical appliances, food, vehicles, metals, chemicals, building materials and other factories. 【Technical Parameters】: 1. System: balanced temperature and humidity control system 2. Temperature range: -40°C~100°C (150°C As instructed) 3. Humidity range: 20~98%R.H. 4. Temperature accuracy: ±0.2°C 5. Humidity accuracy: ±2.5%R.H. 6. Temperature distribution uniformity: ±0.5°C 7. Humidity distribution uniformity: ±3% 8. Heating time: -40°C ~ 100°C takes about 45 minutes 9. Cooling time: 20°C ~ -40°C takes about 55 minutes 10. Inner box size: 50×60×50 11. Outer carton size: 107×147×111 12. Inner box material: stainless steel first-class mirror light plate 13. Outer box material: stainless steel matte line treatment 14. Insulation material: hard foam (such as glass wool at 150°C) 15. Refrigeration system: air-cooled, single-stage, fully enclosed compressor 16. Protection device: fuseless switch, compressor overload protection switch, refrigerant high pressure protection switch, over-temperature protection switch, ceramic fuse, water tray water shortage protection switch, electromagnetic protection switch, fault warning system, alarm. 17. Accessories: window, 2 upper and lower adjustable compartments, 1 hole of 50mm, light in the box 18. Weight: about 250 kg 19. Power source: 3∮, AC220V±10% 60Hz. 【Working Principle】: The operation of the constant humidity and humidity machine system is through three interconnected system cycles: refrigerant circulation system, air circulation system, and electrical automatic control system. 1. Refrigerant circulation system: the liquid refrigerant in the evaporator absorbs the heat of the air (the air is cooled and dehumidified) and begins to evaporate, and finally a certain temperature difference is formed between the refrigerant and the air, and the liquid refrigerant is also completely evaporated into a gaseous state, and then sucked in by the compressor and compressed (pressure and temperature increase), and the gaseous refrigerant absorbs heat through the condenser (air cooling/water cooling) and condenses into liquid. After throttling through the expansion valve (or capillary), it becomes a low-temperature and low-pressure refrigerant into the evaporator to complete the refrigerant circulation process. 2. Air ring system: the fan is responsible for sucking air from the return air outlet, and the air passes through the evaporator (cooling, dehumidification), humidifier, and electric heater (heating) and then sends it to the space required by the user through the air supply outlet, and the sent air mixes with the air in the space and returns to the return air outlet. 3. Electrical automatic control system: including power supply part and automatic control part. The power supply part supplies power to compressors, fans, electric adders, humidifiers, etc. through contactors; The automatic control part is divided into temperature, humidity control and fault protection part; Temperature and humidity control is to compare the temperature and humidity of the return air with the temperature and humidity set by the user, and automatically run the compressor (cooling, dehumidification), humidifier, electric heating (heating up) and other components to achieve automatic control of constant temperature and humidity. Fault protection control is achieved through the combination of pressure protection, delayer, relay, overload protection, etc., and the control of fault protection of components such as compressors, fans, humidifiers, etc. [Instrument model]:     1. Model No.: YS751T-80 YS751T -150 YS751T -225 YS751T -408 YS751T -800 YS751T -1000 2. Internal volume (L): 80 150 225 408 800 1000 3.内尺（cm）H*W*D: 50x40x40 60x50x50 75x50x60    85x60x80   100x100x80   100x100x100 4. Temperature and humidity regulation: Balanced temperature and humidity control (BTHC) control system 5. Working environment: +5°C~+35°C 6. Heater: Nichrome alloy electric heating wire heater 7. Humidifier: Surface evaporation type 8. Blower: Centrifugal fan 9. Airflow mode: Broadband forced airflow circulation (up and out, in and out) 10. Condensation method: air cooled or water cooled