The determination of the soil moisture tester found that the skewness coefficient was greater than zero, indicating that the distribution of variables larger than the average value of soil moisture was more dispersed, and the larger the skewness coefficient, the more dispersed the variable distribution. The above characteristics of soil moisture in this area are due to the characteristics of compensation and consumption of soil moisture. Because the only supplemental source of soil moisture in the test site is atmospheric precipitation, the consumption of soil moisture is soil evaporation and forest transpiration. The amount of precipitation determines the infiltration depth of precipitation, which determines the soil moisture content.
The soil moisture tester found that the average soil moisture was greater than 6%, the standard deviation was greater than 3, and the coefficient of variation was greater than 50%. The upper and lower bounds of the 95% confidence zone ranged from greater than 2; 80 to 200 cm was the secondary active layer. The change of soil moisture is obvious, the same precipitation and evapotranspiration, but only the larger precipitation can infiltrate into this layer, the average value of soil moisture is between 5.5% and 6%, the standard deviation is 2 to 3, and the coefficient of variation is 15% to 50%. The upper and lower bounds of the 95% confidence zone ranged from 1 to 2; the stable layer below 200 cm showed little change in soil moisture. Only soil moisture was affected during the special year. The moisture average is greater than 5.5%, the standard deviation is less than 1, the coefficient of variation is less than 15%, and the range of variation in the upper and lower bounds of the 95% confidence zone is less than 0.5.
PCBA Cleaner Machine automatic water washing machine is an integrated high-end cleaning machine with energy saving, environmental protection and batch cleaning. It can automatically complete cleaning, rinsing (open loop / closed loop) and drying;
Mainly used for cleaning of coated products and high-end precision products such as military, aerospace electronics, medical, automotive new energy, automobiles; multi-variety and small-volume PCBA board cleaning can effectively clean organic and inorganic pollutants such as rosin flux, water-soluble flux, clean-free flux/solder paste remaining on the surface of PCBA after SMT/THT soldering;
Cleaning of poorly printed PCB board solder paste, cleaning of scraper solder paste, etc.
Cleaning area
The cleaning liquid storage tank is used for recycling and storing the cleaning liquid, and the cleaning liquid is subjected to
level 3 filtration, heating and monitoring, and liquid level monitoring;
Cleaning pump: 5.5KW (1), 4 spray arms, 48 nozzles;
Reservoir volume: ≤ 70L (1);
Filter device: stainless steel filter 1mm (1 piece), filter net 0.5mm (1 piece), cleaning folding filter 0.45UM (1);
Heating power: 9KW (1), heating temperature: room temperature - 70 ° C (adjustable);
Liquid level protection: low, medium, stop, over limit;
Spray pressure: 0.1-0.6Mpa (adjustable)
Rinsing area
The rinsing water storage tank is used for recovering the stored water, and the rinsing water is subjected to open-loop
rinsing, heating and monitoring, and liquid level monitoring.
Rinsing water pump: 5.5KW (common cleaning pump) 4 spray arms, 48 nozzles (common cleaning);
Rinse spray chamber tank volume: ≤ 20L (1);
Heating power for rinsing spray box : 6KW (1); heating temperature: room temperature -40 ° C (adjustable);
Filter device: stainless steel filter 1mm (1 piece), folding filter 0.45UM (1);
Liquid level protection: low, medium, stop, over limit;
Spray pressure: 0.1-0.6Mpa (adjustable)
Drying area
The drying section is used to thoroughly dry the product and heat and dry the wind and monitor the temperature.
Drying fan: 0.75KW (1), stainless steel heating tube: 7KW (1), heating temperature: room temperature - 99 ° C
(adjustable);
Automatic Pcba Cleaning Machine,Pcba Cleaning Drying Machine,After Dip Pcba Cleaner Machine,Online Pcba Cleaning Equipment
Shenzhen KunPeng Precision Intelligent Technology Co., Ltd , https://www.electronic-smt.com