The WTH301 is a compact BLE temperature and humidity sensor built for professional cold-chain logistics and transportation monitoring. Plaspy compatible when deployed with BLE-capable vehicle trackers or gateways, the WTH301 adds precise environmental telemetry to any Plaspy-based real-time tracking solution — enabling better compliance, proactive alerts, and more complete fleet management data.
Designed for trailers, refrigerated containers and asset-level environment monitoring, the WTH301 combines long battery life, IP66 waterproof protection, and BLE 5.1 connectivity to deliver continuous, long-term sensing with simple low-cost installation. When paired with a Plaspy-compatible GPS tracker it extends standard location and vehicle telemetry (ignition, immobilizer-capable workflows, fuel monitoring from the tracker) with high-resolution temperature and humidity data for end-to-end visibility.
Key Highlights
- Plaspy compatible BLE sensor: pairs with BLE-capable trackers and gateways to feed environmental telemetry into Plaspy dashboards and reports.
- High accuracy temperature sensing: −40°C to +70°C range with ±0.2°C accuracy between 5°C–60°C and 0.01°C resolution for precise cold-chain monitoring.
- Reliable humidity monitoring: 0–100% RH, ±2% RH accuracy (20–80% RH) with 0.01% resolution to track moisture-sensitive cargo.
- Long operational life: 1200 mAh LiFe battery with more than 3 years runtime under typical reporting conditions, reducing maintenance visits and battery swaps.
- Rugged and simple to install: IP66 waterproof housing and 3M sticker mounting for quick deployment in trailers, containers and assets.
- BLE 5.1 connectivity with up to 150 m open-air range, supporting robust links to vehicle trackers or fixed gateways.
- Compact form factor (75 × 38 × 19 mm, 48 g) that integrates cleanly into fleet and asset installations without adding bulk.
How It Works with Plaspy
The WTH301 communicates environmental telemetry over Bluetooth Low Energy (BLE). In a Plaspy-enabled deployment the typical flow is: the WTH301 broadcasts temperature and humidity values at configurable intervals; a Plaspy-compatible BLE gateway or BLE-enabled GPS tracker picks up those broadcasts and forwards the data to Plaspy’s platform along with GPS location and vehicle telemetry. Plaspy then correlates location, ignition/door status and other vehicle signals with the environmental data so operations teams get real-time tracking and actionable alerts.
- Real-time location and telemetry updates — environmental readings arrive alongside GPS data for context-aware tracking and historical playback.
- Ignition, door and alarm status — when paired with a tracker that reports ignition/door/alarm events, Plaspy can combine those events with sensor readings for smarter alerts and investigations.
- Fuel monitoring integration — Plaspy-level fuel monitoring from the vehicle tracker remains available while environmental telemetry adds cold-chain context.
- Remote immobilizer workflows — Plaspy’s immobilizer or anti-theft actions (where supported by the paired tracker) can be informed by combined telemetry and location for faster incident response.
- Bluetooth sensors and beacons — WTH301 functions as a BLE sensor node; Plaspy receives its sensor broadcasts via BLE-enabled gateways or trackers to enrich fleet telemetry.
Technical Overview
| Model | WTH301 |
|---|---|
| Connectivity | BLE 5.1 |
| Bands / Frequency | 2.4 GHz ISM band (Bluetooth Low Energy) |
| Temperature Range & Accuracy | −40°C to +70°C; ±0.2°C (5°C–60°C), ±1.4°C outside range; resolution 0.01°C |
| Humidity Range & Accuracy | 0–100% RH; ±2% RH (20%–80% RH), ±3.5% RH outside range; resolution 0.01% RH |
| Sampling & Reporting | Samples every 10 seconds (typical) |
| Transmission Distance | Up to 150 m open-air (BLE, subject to environment) |
| Power & Battery | 3 V supply; 1200 mAh lithium iron battery; >3 years lifetime at +7 dB TX power and 10 s reporting; static current ~4.5 µA; peak 10 mA; average ~33 µA |
| Interfaces | LED indicator for status; no external I/O specified; adhesive mount (3M sticker) |
| GNSS | Not applicable (sensor is BLE-only) |
| Bluetooth | BLE 5.1 for sensors and beaconing |
| Remote Management | Not specified (no built-in FOTA or remote device management noted) |
| Form Factor & Protection | 75 × 38 × 19 mm; 48 g; IP66 waterproof housing for harsh environments |
Use Cases
- Cold-chain logistics: continuous temperature and humidity monitoring for pharmaceuticals, food and other temperature-sensitive cargo during transit and storage.
- Refrigerated transport and trailers: discreetly mounted inside trailers or containers to supply per-load environmental telemetry to Plaspy and fleet management systems.
- Container and asset environment tracking: long-life BLE sensors for multi-month installations where maintenance visits are costly.
- Compliance reporting and alerts: automated threshold alerts and historical reporting for regulatory compliance and proof-of-condition in claims handling.
Why Choose This Tracker with Plaspy
The WTH301 is an ideal environmental sensor to pair with Plaspy-compatible GPS trackers because it extends core real-time tracking with precise telemetry that matters to cold-chain and fleet managers. Its low maintenance profile — long battery life, rugged IP66 casing and simple 3M adhesive installation — reduces operational overhead, while BLE 5.1 connectivity ensures reliable links to trackers and gateways. When integrated into Plaspy, the combined solution gives fleet managers actionable insights: location-aware temperature and humidity telemetry, faster incident detection, integrated reports for compliance, and the ability to correlate vehicle signals such as ignition, fuel monitoring or immobilizer events with environmental conditions for fuller operational context.
Whether you need to scale fleet management for refrigerated assets, support anti-theft and immobilizer workflows via paired trackers, or add Bluetooth sensors to an existing Plaspy deployment, the WTH301 provides the focused, reliable environmental sensing required for professional logistics and transportation applications.
Set Up WTH301
To set the tracker send the following commands by SMS messages, the sample setup the device password is hQ5RHFRW, this password is the default
- Restore factory settings
AT+GTRTO=hQ5RHFRW,4,,,,,,FFFF$ - Set the time zone UTC-0
AT+GTTMA=hQ5RHFRW,+,0,0,0,,,,,,FFFF$ - Set the operator APN
AT+GTBSI=hQ5RHFRW,{{apn}},{{apnu}},{{apnp}},,,,,FFFF$ - Set the GPRS server
AT+GTSRI=hQ5RHFRW,4,,1,d.plaspy.com,8888,54.85.159.138,8888,,0,0,0,,,,FFFF$ - Set the update interval 60 seconds.
AT+GTFRI=hQ5RHFRW,1,1,0,0,,,60,60,60,60,7F,40,0,,,FFFF$ - Enable SOS button notification input 2
AT+GTSOS=hQ5RHFRW,2,2,,0,0,0,0,0,0,,,FFFF$