The requirements of the test chamber formulated according to the relevant standards shall meet the following 2 points:
1. The temperature and humidity in the constant temperature and humidity test chamber are monitored by the sensors installed in the work space. For the test of the heat dissipation test sample, the installation position of the sensor is formulated according to the GB / T2421-1999 standard.
2. The temperature and relative humidity of the working space should be constant within the nominal value and the specified tolerance range, and the influence of the test sample during the test must also be considered.
The test of the heat dissipation test sample: the volume of the constant temperature and humidity test box should be at least 5 times the total volume of the test sample, and the distance between the test sample and the inner wall of the test box should be in accordance with GB / T2423.2-2001 Appendix A (standard appendix) Selected, the wind speed in the box should not exceed 1M / S, the structure of the mounting rack or support frame of the test box sample should simulate the real conditions in use as far as possible, or no other regulations, the sample mounting rack is suitable for the test sample and the surrounding space. The effects of heat and moisture exchange should be minimized, and the relevant specifications may also specify dedicated mounting brackets.
Test severity level:
The severity level of the test chamber consists of the test temperature, relative humidity and test time, and is specified by the relevant specifications. The combination of temperature and relative humidity can be selected from the following values:
a 〠30 ℃ ± 2 ℃ 93% ± 3%
b 〠30 ℃ ± 2 ℃ 85% ± 3%
c 〠40 ℃ ± 2 ℃ 93% ± 3%
d 〠40 ℃ ± 2 ℃ 85% ± 3%
During the test, the test chamber should be at the temperature and humidity of the test room, and the test samples at the ambient temperature of the test room should be placed in the normal position or the specified position in the unpackaged, non-energized, "ready to use" state Into the test room, in some cases (for example: using a large test box), the relevant specifications may allow the test sample to be directly sent into the test box under the test conditions that have been processed, but the test sample must be prevented from generating condensation. The temperature within the temperature is adjusted to a predetermined severity level, the time should ensure that the test sample reaches temperature stability, and the calculation of the test time should be calculated after the specified conditions are met. If required by the relevant specifications, the test sample can be energized or work during the conditional test stage. The relevant specifications should specify the working conditions and working time or period of the test sample during the test. At the end of the condition test, the test sample should remain in the test box, adjust the box to the standard atmospheric conditions of the test, and the first reduction is the relative humidity , The time does not exceed 2H, the change rate of temperature in the test box can not exceed 1 ℃ / min on average within 5min. Relative humidity should not exceed 75% during the section, the end of the test conditions, the test samples should enter the recovery procedure.
Requirements for constant temperature and humidity test chambers formulated in the standard
Outdoor bench refers to the seating facilities used in outdoor places, often commonly found in parks, squares, leisure areas, scenic spots and other outdoor environments. The classification of outdoor benches can be introduced according to many aspects such as material, shape and function.
First, classification by material
1. Wooden bench: Wooden bench is one of the most common outdoor benches, usually made of natural wood, with natural and environmentally friendly characteristics. Wooden benches are usually made of solid wood or artificial wood, and the surface is treated with waterproof and anti-corrosion, which can adapt to various climatic conditions in the outdoor environment.
2. Metal bench: Metal bench is made of metal materials, such as cast iron, steel, etc. The metal bench is durable, corrosion resistant, easy to clean and is suitable for all kinds of outdoor environments.
3. Stone bench: Stone bench is made of marble, granite and other stone, which has the characteristics of good texture and beautiful appearance. Stone benches are generally suitable for high-end places such as garden scenic spots and can be integrated with the surrounding environment.
5. Combined material bench: Combined material bench refers to the bench made of different materials, such as the combination of wood and metal, stone and plastic combination. Combined material bench can usually combine the advantages of different materials, more in line with the needs of different outdoor environments.
2. Classification by shape
1. Linear bench: Linear bench is the most common shape of bench, generally composed of a row of seats, forming a straight line arrangement. The linear bench is suitable for outdoor places with large pedestrian flow and can provide more seats.
2. Arc bench: Arc bench is an arc bench composed of multiple seats, usually used in a ring seat area or landscape area. The curved bench can not only provide comfortable seating, but also increase the aesthetics of the place.
3. Wavy bench: The wavy bench is a bench composed of multiple seats in the shape of undulating waves, giving people a sense of movement and flow. The wavy bench is suitable for parks, squares and other places that need to increase vitality and fun.
4. Round bench: A round bench is a round bench composed of a number of seats, which is usually used in outdoor recreation areas and can provide a place for groups to gather.
3. Classification by function
1. Leisure bench: Leisure bench is a common form of outdoor bench, it can provide comfortable seats, so that people can relax in the outdoor environment.
2. Viewing bench: Viewing bench is usually set in a scenic outdoor environment, providing comfortable seats for people to enjoy the scenery.
3. Sitting bench: Sitting bench is usually set in parks, squares and other places with large traffic, to provide people with a short rest and relaxation.
4. Cool pavilion bench: Pavilion bench refers to a form of combination of bench and pavilion, which can provide sunshade, rain prevention and other functions, suitable for outdoor leisure areas.
In short, the classification of outdoor benches can be divided from many aspects such as material, shape and function. Different outdoor environments and needs need to choose a suitable bench type to provide comfortable and beautiful seating facilities
Beach Bench,Deck Chair,Deck Bench,Waterproof Bench
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