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With the improvement of living standards, people's monitoring requirements for food production, distribution and storage are becoming higher and higher, especially for temperature and humidity indicators. Relevant departments have even included this content in the assessment indicators. Due to the large number of detection points, the traditional temperature and humidity monitoring equipment and technology have been unable to meet the needs of refinement and diversification, which requires us to develop a multi-point, remote and convenient intelligent monitoring system in combination with modern science and technology. Chengdu Xinxin Electronic Technology Co., Ltd. uses scientific technology and combined with the actual needs of users to launch various intelligent wireless temperature and humidity monitoring and linkage systems for the warehouse environment, to ensure that the temperature and humidity of the warehouse environment meet the needs of production, scientific research and life to the utmost.
Impact of temperature and humidity environment on archive materials:
(I) Impact of high temperature and high humidity environment on archive materials:
1. The high temperature and humidity of the warehouse will cause some poorly heat-resistant handwritings in some archival paper materials to cause oil seepage, diffusion, and fading, which will cause the handwriting to be ambiguous, and will accelerate the damage to the cellulose from harmful chemical residues in the paper. Hydrolyzing cellulose results in a decrease in paper strength and durability.
2. High temperature is beneficial to the growth and reproduction of archived pests. The optimum temperature for insect growth and development is 22-32 ° C, and the relative humidity is mostly 70-90%. High humidity can maintain the proper water content in the insect body to promote its metabolism and accelerate the development of the insect body. At the appropriate temperature, the greater the humidity, the more insects spawn and the faster they reproduce. There are more than 10 species of insects that endanger the archives. These insects use paper glue and other food to erode the archives and cause holes, and the archives that are severely eaten by them cannot be rescued.
3. The high temperature and humidity of the warehouse will also promote the destruction of archive materials by harmful factors such as harmful gases and dust in the air. Can accelerate the destruction of archival materials by various harmful chemicals.
(II) Impact of low humidity on archive materials:
Too low humidity in the warehouse will cause excessive evaporation of moisture in the archives paper, leading to the destruction of the internal structure of the fiber, making the paper hard and brittle, and reducing the mechanical strength.
(3) The impact of excessive fluctuations in temperature and humidity on the archival materials:
Excessive and rapid fluctuations in temperature and humidity in the warehouse will cause internal stress due to uneven expansion and contraction of the archival material, which will easily reduce its strength and deform, and may destroy the combination of some handwritings and paper, and the combination of film emulsion and film base .
Therefore, the high temperature and high humidity, high temperature and low humidity, low temperature and low humidity, and high and low temperature and humidity of the archives storehouse are unfavorable for the preservation of archive materials. It is necessary to strengthen the control and adjustment of the temperature and humidity of the archives storehouse to make it in a suitable state. Conducive to long-term preservation of archives.
Based on the above points, the National Archives issued the Interim Provisions on the Management of Archives' Temperature and Humidity in 1985, which defined the temperature and humidity ranges of the warehouses that are conducive to long-term preservation of the archives. %; Within the specified range, the day and night fluctuation ranges of temperature and humidity are defined as ± 2 ° C and ± 5% respectively (for relative humidity).
After on-site environmental investigation and combined with the functional requirements, the following plans for the temperature and humidity monitoring system of the archives warehouse were made specifically for the archives management office of Southwestern University of Finance and Economics.
(1) Wireless temperature and humidity probe:
Used to collect temperature data at each monitoring point. On-site power supply, wireless transmission visible distance of 5 kilometers, local display.
It is used to collect humidity data at each monitoring point, on-site power supply, wireless transmission visible distance of 5 kilometers, and local display.
(3) Wireless intelligent base station:
Receive data from various wireless sensors , centralized display to avoid manual inspections, and the terminal has a built-in GPRS module that can remotely send the data to urban offices.
(4) Host computer:
Used to run "Wireless Environmental Monitoring System Software" and store historical data (optional display with touch screen).
(5) LED display:
The temperature and humidity data of each room is displayed in a centralized manner, and the time and date can be displayed through a large LED display, which is intuitive and clear.
When the temperature and humidity data exceeds the limit, send a warning message to the specified mobile phone number.
(7) System software:
Comprehensive management of each monitoring point of the system, including data reading display, historical data query, graph curve display, function parameter setting, startup and self-running, filtering, exporting and printing.
Fourth, Xinxin IoT Southwestern University of Finance archives warehouse temperature and humidity monitoring system system functions:
(1) Data collection:
Automatic data collection, recording and storage 24 hours a day.
(2) Real-time display:
The historical data can be automatically generated into tables, curves and graphics, and the image is intuitive.
(3) Historical storage:
Historical data is stored and backed up securely, and can be queried at will according to customer needs and filtering conditions. The data is exported and printed in various forms, and supports multiple formats such as PDF and Excel.
(4) Over-limit alarm:
You can set the upper and lower limits of temperature and humidity by yourself. When the temperature and humidity exceed the limit, the display terminal and software interface will automatically prompt an alarm and beep on the LCD screen.
(5) SMS alarm:
When the alarm signal appears, the system can send alarm instructions according to the preset alarm cell phone and alarm conditions.
V. Advantages of Xinxin Wulian Southwestern University of Finance Archives' temperature and humidity monitoring system:
(I) Data collection:
Temperature accuracy can reach ± 0.3 ℃, humidity accuracy ± 2%, carbon dioxide ± 30ppm.
(2) Reliability of wireless transmission:
Adopt 779MHz channel communication, wireless transmission has strong AES encryption function, strong anti-interference, and there are abundant communication channels to choose from.
(3) Convenience of on-site installation:
Wall mounting. No wiring is required for wireless collection points. On-site power.
(IV) Concentration of data display:
The sensor data of each detection point is sent to the intelligent DTU for unified display and transmitted to the computer of the management center for centralized display, which is clear at a glance, avoiding manual inspection and recording at regular intervals.
VI. Xinxin IoT Southwestern University of Finance archives room temperature and humidity monitoring system software introduction:
(1) Function introduction:
1.Real-time display of all sensor data in the system and stored in the database
2. Query the historical data of all collection points in the system and draw a graph
3.Set the upper and lower limits of the LCD display alarm terminal
4.Data export printing function
(B) mobile APP:
VII. Features of Xinxin Wulian Southwestern University of Finance Archives Room Temperature and Humidity Monitoring System Product Features:
◆ Long distance: The longest distance for recognition is 80m (normal distance is 0 ～ 50m, the distance between 50 ～ 80m should be equipped with additional antenna), the recognition distance is adjustable.
◆ Anti-collision: Advanced anti-collision technology can identify more than 200 signs per second at the same time.
◆ High speed: recognition speed up to 200Km / h
◆ Security: Encryption algorithm and authentication to ensure data security.
◆ Direction: It can realize directional and non-directional identification.
◆ High reliability: -40 ℃ ~ 124 ℃, anti-impact.
◆ Costability: All adopt 0.18uM chips, lower cost.
◆ Power consumption: Ultra-low power consumption, healthier and more secure.
◆ Transmission: The ISM microwave frequency band is open worldwide, no application or payment is required.
◆ High anti-interference: No special requirements for various interference sources on site. High anti-interference.
◆ Temperature characteristic: ± 0.3 ℃ (If the required temperature range is wider, it must be specially set).
◆ Humidity characteristics: ± 2% H (If the required humidity range is wider, special customization is required).
◆ Measurement time interval: at least 1.5S (if you need faster, special custom development is required).