1. Introduction
The SONOFF TH Elite is an advanced Smart Temperature and Humidity monitoring switch designed to provide real-time environmental data and intelligent control over connected devices. Featuring an LCD screen for immediate feedback, it allows users to monitor temperature and humidity, set automated thresholds, and control high-load equipment up to 20A. This device integrates seamlessly with the eWeLink app, Amazon Alexa, Google Home, and supports Matter Bridge for Apple Home and other smart home ecosystems. It is compatible with various sensors, including temperature & humidity, waterproof temperature, and soil moisture sensors, making it versatile for diverse applications.
Figure 1: SONOFF TH Elite device with connected sensor and smart home integration logos.
Video 1: Overview of SONOFF TH Elite features and sensor compatibility.
2. Safety Information
Your safety is our responsibility. Please read and understand the following safety guidelines before installation and operation:
- The product is designed with UL safety components and RoHS environmental protection materials.
- The casing is made from high-grade V0 Class Flame-Retardant material.
- Equipped with a varistor to absorb peak voltage, protecting against lightning strikes or unstable power supply.
- Ensure proper wiring and installation by a qualified professional if you are unsure.
- Do not expose the device to extreme temperatures or humidity beyond its operating range.
Figure 2: SONOFF TH Elite safety features and certifications (CE, FC, TUV, RoHS, SRRC).
3. Product Overview
The SONOFF TH Elite is an upgraded device in the TH series, offering enhanced performance and features for smart temperature and humidity control.
3.1 Key Features
- 16A/20A Dry Contact: Supports high-load equipment like electric floor heating.
- 6-Month History Data: Review and export temperature and humidity data by hour, day, and month in .xlsx format.
- Real-time Monitoring: Continuously monitors and displays temperature and humidity on the LCD screen and in the eWeLink app.
- LAN Control: Ensures device operation even when Wi-Fi is disconnected.
- Auto Mode: Automatically turns devices on/off based on preset temperature and humidity thresholds.
- Timely Notifications: Receive push notifications on your phone when thresholds are met or device state changes.
- Voice Control: Compatible with Amazon Alexa and Google Home.
- Matter Bridge Support: Connects to Apple Home, Google Home, Alexa, SmartThings, and Home Assistant via eWeLink CUBE OS.
- Upgraded Sensor Connector: RJ9 4P4C for stable and reliable hot-plugging.
3.2 Device Components
Figure 3: Labeled diagram of the SONOFF TH Elite device.
- LCD Screen: Displays real-time temperature and humidity.
- Auto Mode Button: For local auto mode configuration.
- RJ9 4P4C Interface: For connecting external sensors.
- Dry Contact Terminals: For volt-free control of external circuits.
- Upgraded Wiring Terminal: For power and load connections.
- DIN Rail Mounting: For easy installation in electrical panels.
- Protective Cover: To shield wiring terminals.
4. Specifications
Below are the technical specifications for the SONOFF TH Elite models:
Figure 4: SONOFF TH Elite specifications and package contents.
| Attribute | THR316D | THR320D |
|---|---|---|
| Model | THR316D | THR320D |
| Input/Output | 100-240V~ 50/60Hz 16A Max | 100-240V~ 50/60Hz 20A Max |
| Casing material | PC V0 | |
| Wi-Fi | IEEE 802.11 b/g/n 2.4GHz | |
| Color | White | |
| Dry contact | 5-30V, 1A Max | |
| Power Source | AC | |
| Communication method | Bluetooth-Compatible, Wi-Fi | |
| State of Assembly | Ready-to-Go | |
| Compatibility | All Compatible | |
| Certification | CE | |
| Package Dimensions (approx.) | Length: 15cm, Width: 10cm, Height: 8cm | |
| Package Weight (approx.) | 0.2 kg | |
5. Setup
5.1 Wiring Instructions
Before wiring, ensure the main power supply is turned off to prevent electric shock. The TH Elite supports both 1-channel AC load and dry contact connections.
Figure 5: Wiring diagrams for 1-channel load and dry contact, and quick start steps.
5.1.1 1-Channel AC Load Wiring
- Connect the Live (L) and Neutral (N) input wires from your power source to the "L In" and "N In" terminals respectively.
- Connect the Live (L) and Neutral (N) output wires to your appliance (e.g., light, heater) to the "L Out" and "N Out" terminals respectively.
- Ensure all connections are secure and insulated.
5.1.2 Dry Contact Wiring (Volt-Free)
The dry contact output acts as a switch, controlling the on/off state of a circuit without providing power. This is ideal for controlling traditional thermostats, combi boilers, or other systems that require a volt-free switch.
- Identify the COM (Common), NC (Normally Closed), and NO (Normally Open) terminals on the TH Elite.
- Connect the control wires from your external system to the appropriate COM and NO (or NC) terminals.
- The output state of the normally open dry contact is consistent with the power relay. Separate control is not available.
5.2 Sensor Connection
The TH Elite features an upgraded RJ9 4P4C connector for stable and reliable sensor connections. It supports hot-plugging.
Figure 6: Various sensors compatible with SONOFF TH Elite.
- Temperature & Humidity Sensor (Si7021, AM2301): For monitoring ambient environment.
- Waterproof Temperature Sensor (DS18B20/WTS01): For monitoring water temperature.
- Soil Moisture Sensor (MS01): For monitoring soil moisture.
- Plug the sensor into the RJ9 4P4C interface on the TH Elite.
- For extended reach, use the RL560 sensor extension cable (up to 60M for Temp/Humi sensors, 10M for Soil Moisture Sensor).
5.3 App Download and Pairing
- Download the eWeLink app from the App Store (iOS) or Google Play Store (Android).
- Power on the TH Elite device after completing the wiring.
- Open the eWeLink app and follow the on-screen instructions for Bluetooth pairing or scan the QR code on the device/packaging for quick setup.
6. Operating Instructions
6.1 Real-time Monitoring
The TH Elite provides real-time temperature and humidity readings on its LCD screen and within the eWeLink app. The app refreshes data every 5 seconds.
Figure 7: Real-time temperature and humidity display on the device.
6.2 Control Modes
6.2.1 Manual Control
You can manually turn the connected device on or off via the eWeLink app from anywhere, anytime.
6.2.2 Auto Mode (Local & App)
The device can automatically turn on/off based on preset temperature and humidity thresholds at different time periods. This feature is reliable even if Wi-Fi is disconnected (Local Auto Mode).
Figure 8: Manual and Auto Mode settings in the eWeLink app.
- In the eWeLink app, navigate to the TH Elite device.
- Select "Auto" mode.
- Set your desired temperature or humidity thresholds (e.g., "Temp. Higher than 30°C" to turn ON, "Temp. Lower than 25°C" to turn OFF).
- Define the effective period (e.g., 08:00-10:00) for these rules to apply.
- Save your settings.
6.3 Data History and Export
The TH Elite stores up to 6 months of temperature and humidity history data. This data can be reviewed by hour, day, or month and exported in .xlsx format for detailed analysis.
Figure 9: Temperature and humidity history data in the eWeLink app.
6.4 Notifications and Scene Automation
Receive timely push notifications on your phone when the monitored temperature or humidity reaches your preset thresholds. You can also create smart scenes to automate actions based on these conditions (e.g., turn on a humidifier if humidity drops below 50%RH).
Figure 10: Timely notifications and scene automation examples.
6.5 Voice Control Integration
The SONOFF TH Elite is compatible with popular voice assistants. Link your eWeLink account to Amazon Alexa or Google Home to control your devices using voice commands.
Figure 11: Voice control integration with Alexa and Google Home.
- Amazon Alexa: "Alexa, turn on heater."
- Google Home: "Hey Google, what's the temperature of my boiler?"
6.6 Matter Bridge for Apple Home
Connect your SONOFF TH Elite to Apple Home and other Matter-compatible platforms (Google Home, Alexa, SmartThings, Home Assistant) via the eWeLink CUBE OS built-in Matter Bridge. This provides free, local, and seamless integration.
Figure 12: Matter Bridge integration for Apple Home and other platforms.
7. Maintenance
- Cleaning: Wipe the device with a dry, soft cloth. Do not use harsh chemicals or abrasive cleaners.
- Firmware Updates: Regularly check the eWeLink app for available firmware updates to ensure optimal performance and security.
- Sensor Care: Keep sensors clean and free from debris for accurate readings. For waterproof sensors, ensure the probe is intact.
- Connection Check: Periodically inspect wiring connections to ensure they remain secure.
8. Troubleshooting
- Device not powering on: Check power connections and ensure the main power supply is active.
- Cannot connect to Wi-Fi: Ensure your Wi-Fi network is 2.4GHz. Verify Wi-Fi password and signal strength. Try resetting the device and re-pairing.
- Inaccurate sensor readings: Check if the sensor is properly connected to the RJ9 4P4C port. Ensure the sensor is clean and not obstructed. Calibrate if necessary (check app settings).
- App control issues: Ensure your phone has an active internet connection. Check if the eWeLink app is updated to the latest version. Restart the app or your phone.
- Voice control not working: Verify that your eWeLink account is correctly linked to Alexa or Google Home. Check your internet connection and the voice assistant device's status.
- Automations not triggering: Double-check the conditions and actions set in your Auto Mode or Scene Automation rules within the eWeLink app. Ensure the effective period is correctly configured.
9. User Tips
- For critical applications, consider setting up redundant notifications or monitoring to ensure desired conditions are maintained.
- Utilize the 6-month history data to identify trends and optimize your automation rules for energy efficiency or comfort.
- When using the dry contact feature to replace a traditional thermostat, ensure you understand the thermostat's wiring and the TH Elite's dry contact functionality to avoid damage.
- Explore the eWeLink add-on for Home Assistant to unlock advanced automation possibilities and integrate with a wider range of smart devices.
10. Warranty and Support
For warranty information, technical support, or further assistance, please refer to the official SONOFF website or contact their customer service directly. Keep your purchase receipt as proof of purchase for warranty claims.