Programmable low temperature constant temperature and humidity box can simulate a variety of temperature and humidity environment, suitable for testing electronics, electrical appliances, food, automotive, rubber, plastics, plastics, metal and other products, to meet the GB/T2423, GJB150A1/4 reliable under various harsh environments The stability parameters of the machine will provide you with the basis for forecasting and improving product quality and reliability.
How to control the temperature and humidity inside the programmable cryogenic temperature and humidity chamber?
Programmable low temperature constant temperature and humidity box products on the provisions of the temperature and humidity, to see the product's high temperature, low temperature, and humidity resistance, then the temperature and humidity machine at the same time with heating, cooling, humidification, dehumidification capacity.
Heating device is to control the constant temperature and humidity box is not the key to increase the temperature; it is the controller to get the temperature command will output voltage to the relay, about 3-12 VDC added to the solid state relay; its AC is equivalent to the wire connected The contactor also sucks at the same time, the heater has a voltage at both ends to make it heat, bring the heat to the box through the circulating fan, so that the constant temperature and humidity machine heats up, then the temperature reaches your set value quickly; In the solid-state relay on-off adjustment; we look at the screen temperature and humidity control how much heat to regulate the heat; this is more than 89 degrees in temperature control, in the 89 degrees below the temperature stability how to control it? Constant temperature and humidity in the side How much heat is generated through the solid state relay; the other is through the refrigeration cycle of the compressor to achieve a dynamic balance; the temperature is constant.
Cooling is an important part of a constant temperature and humidity machine. It is an important parameter for determining the performance of a constant temperature and humidity machine. It consists of four components: a compressor, a condenser, a throttling device, and an evaporator. The compressor is the heart of the refrigeration system. It inhales low-temperature and low-pressure gases, turns into high-temperature and high-pressure gases, and releases heat through condensation into liquids. The heat is taken away by fans. Therefore, the temperature below the constant temperature and humidity is caused by hot air, and then it is throttled to low-pressure liquids. Secondly, through the evaporator, it becomes the low-temperature and low-pressure gas and finally returns to the compressor; the refrigerant absorbs heat in the evaporator to complete the gasification process and absorb heat to achieve the purpose of cooling, and completes the process of cooling the constant temperature and humidity.
The humidifying system is almost the same as the heating system; it is the heating of the heater water into a steam process; the purpose of humidification of the constant temperature and humidity machine is accomplished.
The dehumidification system is also completed by a refrigeration system. The evaporator is placed inside a constant temperature and humidity machine. In a relatively cold environment, the high humidity gas will see a cold object condensing into a liquid; thus, the high humidity gas of the tank will be few, To achieve the purpose of dehumidification.
Basic conditions required for operation of ultraviolet light aging test chamber
The ultraviolet light aging test box can simulate the damage caused by sunlight, rain, and dew. QUV uses a fluorescent ultraviolet (UV) lamp to simulate the effect of sunlight, using cold simulated moisture rain and dew. Tested materials were placed in a cycle program of alternating light and moisture at a certain temperature. QUV can take several days or weeks of testing to reproduce the hazards that occur outdoors for months to years. Types of hazards include: fading, discoloration, loss of light, chalking, cracking, turbidity, foaming, embrittlement, strength degradation, and oxidation.
Kunshan Haida Instrument Engineer pointed out that the ultraviolet light aging test chamber needs three major conditions in actual experiments: power supply conditions, environmental conditions, and water supply conditions, which must be met one by one in order to successfully operate the entire experiment. What about these three conditions?
Power supply conditions
Power Requirements: AC380V±10% 50±0.5Hz Three-phase five-wire system
Pre-installed power: total power +2.0KW
Requires the user to configure the air or power switch for the device at the installation site
Environmental conditions
Ambient temperature: 5°C to +30°C (average temperature ≤30°C within 24 hours)
Environmental humidity: ≤85%RH
Water supply conditions
Use purified water, distilled water, deionized water. Resistivity ≥ 500Ω.m
