Reefer Gas Monitor Terminal
A multi-parameter monitoring terminal installed inside refrigerated containers that detects ethylene, CO₂, temperature and humidity in real time, assessing the ripeness of ethylene-sensitive fruits such as durian and the state of the transport environment - turning "you only know if it is spoiled when you open the box at port" into "visible, warnable and actionable en route".
Product Overview
A smart gas monitoring terminal designed for sea/land transport of ethylene-sensitive fruits (e.g. durian). Pairs with the reefer terminal via Bluetooth and transmits data to the ucontainers platform over 4G or low-orbit satellite.
Key Pain Points
- Durian continuously releases ethylene en route, accelerating ripening
- Without timely intervention, batches can spoil
- Cargo damage risk cannot be assessed before opening at port
- Long ocean voyages amplify the risk of deterioration
Product Value
- From "unknowable until opening at port" to "visible en route"
- From "passively accepting losses" to "early warning"
- From "blaming after opening" to "intervention en route"
- Every batch is queryable and traceable with full-chain records
System Architecture
A four-layer end-to-end data link from inside the container to the user phone.
Monitoring Terminal
Installed inside the reefer container, collecting ethylene, CO₂, temperature and humidity data
Reefer Terminal
Receives Bluetooth broadcast data and transmits via 4G or low-orbit satellite
ucontainers Platform
Data storage, analysis, threshold alerts, visualized on mobile
User Phone
View data in real time, receive alerts and intervene remotely
Core Features
From ethylene concentration to local storage, eight capabilities cover the full cold-chain gas monitoring scenario.
Ethylene Detection
0~100 ppm range, precisely captures fruit ripeness changes and warns of over-ripening risk early.
CO₂ Detection
380~32,000 ppm, helps assess fruit respiration intensity and verifies cold-chain sealing and ventilation.
Temperature Detection
-40~85°C, accuracy ±0.5°C, ensuring compliant and traceable reefer transport conditions.
Humidity Detection
0~100% RH, accuracy ±3% RH, preventing condensation or overdrying from damaging cargo.
Local Storage
60 days of circular data storage (approx. 43KB Flash), no data loss offline.
Bluetooth Transmission
Built-in PA amplifier for stable transmission to reefer terminal or phone, wiring-free deployment.
Ultra-Low Power
Detection interval > 20 min (configurable), one-time lithium battery lasts > 3 years.
Status Indicator
Three-color LED clearly shows power on/off, battery level, clock initialization and other status.
Technical Specifications
Sensor configuration and device parameters defining the hard metrics of industrial-grade cold-chain gas monitoring.
Sensor Configuration
| Item | Range / Accuracy | Operating Temp |
| Ethylene C₂H₄ | 0 ~ 100 ppm | -20°C ~ 60°C |
| Carbon Dioxide CO₂ | 380 ~ 32,000 ppm | 10°C ~ 50°C |
| Temperature | -40 ~ 85°C,±0.5°C | — |
| Humidity | 0% ~ 100% RH,±3% RH | — |
Device Parameters
| Interval | > 20 min (configurable) | |
| Local Storage | 60-day circular storage (approx. 43KB Flash) | |
| Communication | Bluetooth + PA (PATX / PARX) | |
| Clock | RTC always powered, factory-initialized, independent of switch | |
| Power | Disposable lithium CR17450 × 2 (2500mAh × 2) | |
| Service Life | > 3 years | |
| Operating Temp | -10°C ~ 60°C | |
| MCU | TLSR8258 (17 / 32 GPIO) | |
| Physical Switch | Supported (cuts all circuits except RTC) | |
| Status LED | Green (power on/off), Red (low battery), Yellow (clock not initialized) | |
Product Advantages
From precise alerts to global coverage, five advantages protect every container of perishable cargo.
Precise Alerts
Four-in-one judgment of ethylene + CO₂ + temperature + humidity reduces false alarms from single metrics.
Full Traceability
60-day local storage + cloud sync; every batch is queryable, traceable and auditable.
Global Coverage
Dual 4G + LEO satellite channels transmit data even in dead zones at sea.
Long Battery Life
> 3-year service life covering multiple round trips without mid-journey maintenance.
Easy Installation
Plug-and-play inside the reefer; auto Bluetooth pairing, no wiring or manual tuning.
Make Every Container of Durian "Visible"
boxlog Reefer Gas Monitor - ucontainers next-gen smart cold-chain monitoring product. Open for collaboration.
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