Temperature and humidity monitoring system for cold chain logistics based on RFID technology
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Cold chain logistics refers to a systematic project that temperature and humidity sensitive products are always in a pre-defined low temperature environment during production, storage, transportation, and sales to ensure the quality of goods and reduce logistics losses. It is generally divided into cold storage ( Frozen) processing, refrigerated (frozen) storage, refrigerated (frozen) transportation and distribution, and refrigerated (frozen) sales, among which refrigerated transportation and distribution are the weak links of cold chain logistics. The transportation of fruits belongs to cold chain logistics.
During the transportation of fruits, the temperature should be strictly controlled at 0℃~4℃), and the humidity should be strictly controlled at 85~90%. If you use traditional temperature and humidity monitoring methods, you can only monitor the end-to-end node temperature and humidity, but even if the node measures the temperature and humidity normally, it cannot guarantee that the temperature and humidity will always be normal during the transportation process. Using RFID technology, you can understand the fruit during the transportation process. Whether the temperature and humidity changes and possible quality changes caused by this. RFID still has the cost advantage of large-scale application.
In response to this demand, the company launched a fruit cold chain logistics temperature and humidity monitoring system based on RFID + GPRS.
Through the combination of advanced active RFID technology and wireless communication technology, the quality of the product can be managed in a detailed and real-time manner.
1. Working principle
First, the temperature and humidity label will be loaded on the container or the target item (box), and after the shipment has started, the temperature and humidity of the environment where the item is located will be continuously recorded. There are generally two application modes. One is to upload the temperature and humidity curve at each intermediate site or destination at one time, and the logistics management platform integrates all uploaded data to monitor the quality of items in different links; the other is to set up on the transport vehicle/ship GPRS real-time transmission equipment, logistics management platform can continuously monitor target items. The only difference between the two modes is that the latter, the real-time mode, can be used to rescue some valuables, not just the former mode can only identify whether the items are damaged. Of course, the active label identifies a certain packaging box (cabinet), and different packaging units in the same container can be monitored by installing multiple active labels.
The monitoring equipment can also be equipped with a GPS module. Through GPS and GIS technology, the monitoring center can locate and dispatch the geographic location of container vehicles.
If the temperature and humidity changes beyond a preset range, such as 20°C to 30°C, the system will automatically give an early warning. If there is a record in the middle of the curve that is significantly lower than 20°C, you can query the corresponding location and external environment based on this time, so as to explore the corresponding temperature and humidity changes.
Information collection of vehicles in transit: RFID readers read RFID electronic temperature and humidity tags in refrigerated compartments wirelessly, and transmit them to GPS vehicle-mounted terminal equipment through data lines. At the same time, GPS vehicle-mounted terminal equipment receives positioning information from GPS positioning satellites through an external antenna .
Information transmission of vehicles in transit: GPS vehicle terminal equipment obtains temperature and humidity information and GPS positioning information and sends it to the communication data center through the GPRS wireless network. The communication data center then sends the encrypted data to the GPS communication gateway through the router through the APN special tunnel, and finally transmits it to the database server.
2. Program features:
RFID data storage capacity is large, and the maximum user space can be expanded to 256KB;
Reusable, low cost of use, no manual intervention, no need to detach the item;
The communication distance is long, and it can communicate with a base station reader in a wide range of 80 meters, and it can also maintain a communication distance of 30 meters with a handheld reader;
Built-in high-energy lithium battery power supply, and adopts micro-power design, long service life (5 years);
The label is small in size and easy to install and use.
Large flow: extremely high anti-collision performance, adopting multiple anti-collision schemes, supporting simultaneous reading of more than 200 tags;
It supports high-speed mobile reading, and the moving speed of the identification card can reach more than 200 km/h.
High reliability, working temperature and humidity -40℃~85℃, waterproof and shockproof.
High anti-interference: There are no special requirements for various interference sources on site, and the installation is convenient and simple.
There is no need to apply for and pay for the ISM microwave frequency band that is open worldwide.
Ultra-low power consumption: safer and healthier for the human body.
You can quickly grasp the temperature and humidity conditions during transportation, the most important thing in freshness management.
Promote the improvement of freshness management in the distribution process (improvement of shipping methods, selection of logistics routes).
If necessary, it can be expanded to a cold chain monitoring center data platform established by an enterprise or alliance covering the entire cold chain process.
It can promote the safety of fresh food to consumers and establish a brand image. Provide consumers with “rest assured” services and establish a brand image; provide temperature and humidity data records, enhance core competitiveness, and meet higher-level “green food consumption” needs.
The temperature and humidity index can be set dynamically, which is convenient to use.
3. System composition
The company’s products used in the solution:
Company RW-T600 electronic label
The 2.4G long-distance RW-T600 temperature sensor electronic tag produced by the company. The company’s RW-T600 has a large temperature coefficient of resistance, sensitive induction, high resistivity, and small component size. The resistance value changes with temperature changes basically in a linear relationship. Within the temperature measurement range, the physical and chemical properties are stable, and the long-term reproducibility is good. The measurement accuracy is high, and the effective recognition distance can reach 0-80m. In addition to the functions of identification and positioning, the temperature sensing electronic tag can also obtain real-time temperature data through the temperature sensing device. And the temperature data of the monitored object is transmitted to the monitoring management system through the electronic tag, so as to realize the temperature warning during the monitoring process. The product’s leading technology, full-industrial design and outstanding features enable it to provide a brand-new detection concept in cold chain, medical, warehouse management, power failure detection and other places. The effective identification distance is 80 meters, and it is widely used in various applications. Kind of field.
Company tracking locator RW-R102
RW-R102 car tracker is a perfect combination of GSM and GPS technology. Precise size and concise appearance, and top craftsmanship. It is a typical design combining communication products and GPS trackers. It is a smart size, high-precision remote positioning device. On the basis of GPS satellites, it provides you with accurate and unmistakable location information under dynamic conditions. The personal remote positioning device transmits the longitude and latitude coordinates to the authorized mobile phone. You can use these features to protect and search for the elderly and children. Moreover, you can use it for security purposes and other purposes such as the need for remote positioning to protect property safety and animal tracking.
Company RW-R801 Reader
The RW-R801 produced by the company has stable performance, reliable work, strong signal transmission capability, an effective identification distance of up to 120m, and a service life of up to 30 years. Its leading technology, full industrial design and outstanding cost performance, Give it an excellent competitive advantage. The main functional advantage is lightning protection and impact protection, meeting the requirements of industrial environments.
Four, system function
RFID function. Support the application of RFID equipment in the logistics process, including door opening and closing alarms, temperature and humidity monitoring in the car, etc.
GPS/GIS monitoring. Through the integration of GPS, GPRS and GIS, the transportation vehicles can be monitored in real time.
Business process synchronization. Apply workflow management concepts to achieve a high degree of coordination of internal business processes.
Cryogenic equipment management. Support the daily management and maintenance of cryogenic equipment.
Temperature and humidity monitoring. Real-time monitoring of the humidity, temperature and humidity that affect the quality of goods in the logistics process, and setting up an early warning mechanism.
Quick storage function. Provide quick warehousing function for special goods.
Prompt and event management. Provide system users with prompt and event management functions.
Fleet optimization. Improve the management and control of the transportation fleet.
Transport plan execution management. Manage the implementation of the transportation plan throughout the process.
policy support. Apply statistical analysis methods to achieve support for business decision-making.
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