Temperature and humidity monitoring system scheme

Temperature and humidity monitoring
I. Design scheme and product overview
THMonitor distributed environmental monitoring system is a highly reliable, high-precision and user-friendly network environment monitoring system developed by ESD Aegir for several years. It has become the basic equipment for centralized monitoring of medical, food, telecommunications, electric power, industrial chemicals, securities, banking, public environment and small and medium-sized computer room equipment. It has the characteristics of scattered data collection points, wide coverage, multiple data types, high acquisition accuracy, stable and reliable system, etc. THMonitor system adopts RS-485 protocol, TCP/IP protocol networking, wireless Zigbee protocol networking, considering the diversity and complexity of field equipment, adopts distributed system architecture, data collection also adopts standardized interface, the expansion of the system is very convenient.

The 50682-JS series temperature and humidity recorder independently developed by the company is widely used in the THMonitor system (obtained the utility model patent certificate officially issued by the state). The intelligent temperature and humidity data recorder is an instrument for monitoring and recording a number of climate parameters in agricultural research, food, medicine, chemical industry, meteorology, environmental protection, electronics, laboratory and other fields. The recorder is ESD Aegir absorb the advantages of similar foreign products and combined with the characteristics of our own design, can record temperature and humidity and other climate parameters. High precision Swiss original imported, integrated temperature and humidity digital sensor is used to store the sampling data in the recorder memory. And the data collected and recorded can be transmitted to the computer for processing. The recorder uses high energy battery power supply, optional external power supply, small size and easy to carry, the power consumption of the whole machine is very small.

2.1 Technical specifications of temperature and humidity recorder

QUOTE

QUOTE Record and work humidity range: 0 ~ 100%RH.

QUOTE Accuracy: Temperature ±0.5℃ ±3%RH

QUOTE Measuring range: -45℃ ~ 125℃.0-100%RH

QUOTE Recording capacity: 50000

QUOTE Swiss original imported integrated temperature and humidity sensor.

QUOTE LCD resolution: Temperature 0.1℃ humidity 0.1%

QUOTE Interface: Zigbee, RS485, GPRS
QUOTE Through the metrology Institute, CTI and other authoritative testing and certification departments at all levels calibration, testing and certification.

                         
3. Data Overview of the host technical parameters：

Display the data of all wireless temperature and humidity recorders, flip screen display, each interface displays a maximum of 40 channels of temperature and humidity values

(1) : 7-inch full touch color display

(2) : USB interface easily export data

(3) : Handheld or fixed installation

(4) : fully isolated universal input, a variety of signal acquisition

(5) : All aluminum sealed shell and internal shielding plate, work normally in harsh environment

(6) : Ethernet access, set a fixed IP, and then any computer in the LAN can view and download data through software

(7) : The display interface is rich, can view real-time curve and historical curve, and save alarm information in real time, so that each alarm information will not be lost

(8) : The single channel name supports Chinese character modification

(9) : Support data transmission platform, mobile phones, computers can access data in real time, and download data.

Interface: ZIGBEE antenna, Ethernet, 232/485 interface, USB data port, DC power port, SMS alarm antenna (SMS optional)

4. System design scheme

4.1 Network topology

无线拓扑图

Note:

The THMonitor Client software is a tool for querying historical data and real-time data on clients.

THMonitor Server software is server-side software, which together form the C/S architecture.

THMonitor monitoring system includes three parts: user layer, control layer and equipment layer. The internal management of THMonitor system is very convenient, the whole process of automatic control, accurate data, save manpower and material resources, and fully meet the requirements of automatic temperature and humidity environmental monitoring.

4.1.1 Three-layer structure of the system

◆ User layer: including any networked computer in the company, after installing THClient client software, you can view the current real-time running status or historical data in real time.

Working principle: All data is stored in the control layer (control server) above, the user layer can only query historical data through the LAN (or Internet), or view real-time data (there is a delay, generally not more than 2 minutes).

Workflow: When you run the THMonitor Client software - Enter the server IP address and port number, you can view real-time monitoring data and query historical data.

When receiving real-time data from the server, the THMonitor Client software determines the data. If the temperature and humidity data exceeds the set upper and lower limits, the THMonitor Client software will play an alarm sound.


◆ Control layer: Run THMonitor monitoring software, collect data in real time, and write the data into the database, manage all loggers remotely online, set up, download data and so on. The control layer is equivalent to the Server side of the C/S architecture, and the core is the THMonitor monitoring software.

This project uses SQL2008 database, the data is encrypted, any user can not modify the data, if any user attempts to modify, the modified data will be regarded as invalid data, can not be queried.

◆ Equipment layer: All high-precision instruments can automatically record temperature and humidity, and send them to the control center (MC) through Ethernet or GPRS network, which is automatically controlled by THMonitor software. Even if the server is not started or the line is faulty, the logger can automatically record data without data loss.

4.1.2 Data Protection

◆Dual data protection: the database is stored in the database and the recorder at the same time, even if the computer system fails, the data will not be lost.

◆ Proprietary network to ensure reliable and stable network. The wiring of the system adopts the national standard four-core shielded cable, which is strong and durable, the signal is resistant to strong current interference, and is not easy to lose.

◆ Encryption verification: The data in each database is encrypted and saved. If you manually modify the data, the verification fails. As a result, the data is considered invalid and cannot be queried by the THMonitor Client software.

◆ Backup: Automatically back up once a day, compress and copy the THMonitor software installation directory to a compressed file, and then copy the file to the backup server. In the event of a server failure, the THMonitor system can be restored from the backup file.

4.2 THMonitor real-time network monitoring software

THMonitor is the latest generation of real-time network monitoring software developed by our company, based on Windows operating system, using Visual C++ development, the interface is very beautiful and friendly, user-friendly operation. In order to make the administrator more convenient management, some customized development will be done for this project.

The main interface is as follows:

THMonitor software has the following features:

(1) Real-time display of data collected by each monitoring point. If the data exceeds the upper and lower limits set, the alarm sound is automatically played and an alarm message is sent to the administrator's mobile phone.

Note: The first-level administrator can specify the matching relationship between the alarm SMS and the administrator's mobile phone, such as specifying which instruments send alarm information to an administrator.

(2) Real-time display of system operation information, so that administrators can monitor the running status of the entire system at any time. If a fault occurs, the administrator should handle it immediately.

(3) Real-time alarm. And according to the set conditions trigger sound and light alarm or send a short message to the administrator's mobile phone. You can set a maximum of five administrator mobile numbers.

(4) Display the status of the collection point with red, yellow and green light state, which is convenient for users to intuitively display.

(5) Online increase or decrease recorder, convenient management.

(6) Online modification of recorder status.