Table 2.
System performance comparison.
| System | Parameters | Type | Resolution | Range | Accuracy | Response Time | Packaging Method | Group | Shelf Life | Applicability | Other |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Previous system | Temperature | SHT11 | 0.1 | −40 °C~120 °C | ±0.4 °C | - | - | - | - | Easy, simple | - |
| Humidity | SHT11 | 0.1 | 0~100% RH | ±3% RH | - | - | - | - | |||
| The cold chain real-time monitoring and tracing system | Temperature | SHT11 | 0.1 | −40 °C~80 °C | ±0.3 °C | - | Refrigeration preservation packaging at different temperature | 1 | 12.0 d | Comprehensive, real-time, online and simple | Add real-time alerts |
| Humidity | SHT11 | 0.1 | 0~100% RH | ±2% RH | - | 2 | 10.5 d | ||||
| O2 | AJD-4M-O2 | 0.1 | 0~30% vol | ±1% FC | <25 s | Modified atmosphere packaging (4 °C, 90% RH) |
3 | 18.0 d | |||
| CO2 | AJD/L/4CO2 | 0.1 | 0~5% vol | ±2% FC | <25 s | Preservative preservation packaging (4 °C, 90% RH) |
4 | 9.0 d | |||
| C2H4 | A15-75D | 0.1 | 0 ppm~100 ppm | ±1 ppm | <25 s | - | - | - | |||
| Advantage | Increased monitoring parameters, the monitoring and traceability of CO2, O2 and ethylene, better accuracy and traceability of temperature and humidity, improving the management of the cold chain | ||||||||||