Freshliance — Real-Time Temperature Sensor (WiFi / 4G)
The Coeus-4G/WiFi temperature sensor from Freshliance is designed for real-time environmental monitoring in both static and mobile applications. Available in Wi-Fi and 4G versions, these IoT data loggers provide reliable temperature and humidity data with robust alerting, long battery life, and flexible deployment.
Device specifications
| Coeus-WiFi | Coeus-4G | |
|---|---|---|
| Data upload network | WiFi | 4G |
| Device configuration network | Device AP | 4G |
| Maximum power consumption | ≤500mA | ≤800mA |
| Built-in sensor — temperature | −30°C ~ +60°C, ±0.5°C F.S. | |
| Built-in sensor — humidity | 0–100% RH (no condensation), ±3% (25°C, 20–80% RH), ±5% (others) | |
| External probes | Up to two external probes — see probe table below | |
| Logging interval | 1 min ~ 2 days | |
| Uploading interval | 1 min ~ 2 days | |
| Memory capacity | 120,000 readings, circular buffer | |
| Main power supply | USB-Type C, 5V/2A (DC) | |
| Backup battery | Rechargeable lithium battery, 2600mAh — up to 60 days (15-min upload interval) | |
| Alarm mode | Audible and visual alarm | |
| Device dimensions | 109 × 33 × 80 mm (L×W×H) | |
| Display | LED & LCD, 85 × 52 mm | |
| Weight | 175 g | |
Data upload network, device configuration network, and maximum power consumption are the only specs that differ between the two hardware versions — everything else is shared.
Optional external probes
| Probe type | Measuring range | Measuring accuracy |
|---|---|---|
| Temperature probe | −30°C ~ +70°C | ±0.5°C (−30°C~+50°C), ±1.0°C (others) |
| −90°C ~ +200°C | ±0.3°C (−40°C~+100°C), ±0.5°C (−80°C~−40°C; +100°C~+150°C), ±1.0°C (others) | |
| Temperature & humidity probe | −40°C ~ +85°C | ±0.5°C F.S. |
| 0–100% RH | ±3% RH (25°C, 20–80% RH), ±5% RH (others) |
Standard cable length: 2 m. Customizable lengths available: 5 m, 10 m, 15 m, or 20 m.
The Coeus-WiFi temperature sensor connects via WiFi — no SIM card or mobile data plan required — for stable, cost-effective monitoring in indoor environments. The Coeus-4G version automatically uploads data via a built-in 4G SIM card, with no need for Wi-Fi; a direct cellular connection enables seamless setup and real-time tracking, even in mobile or remote environments.
Supports two external probes, available in three sensor types:
Default probe cable length: 2 meters, customizable upon request. Combine with an external probe to extend the monitoring range — ideal for cold rooms, incubators, or dry ice applications.
Real-time access and remote configuration via both the mobile app and the cloud platform — no need for on-site manual checks.
Equipped with a 2600mAh lithium battery, supporting up to 90 days of operation at a 1-hour logging interval. Keeps monitoring reliable during power outages.
Even during a WiFi or 4G disconnection, data is stored locally and automatically uploaded once the network connection is restored.
Receive SMS, email, and app push notifications over the internet, plus visual and audible alerts on the device itself — a red flashing light and buzzer.
Supports temporary data export during active operation, for compliance checks or quick reviews.
The Coeus series 4G/WiFi temperature sensor is mainly used for temperature and humidity monitoring in cold rooms, especially fridges and freezers. The fridge/freezer/refrigerator real-time data logger automatically uploads all monitoring data to the cloud via WiFi or 4G, depending on the version. It also has a large LCD screen so users can intuitively view the current temperature and humidity, max/min values, and date and time.
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