SONOFF AirGuard TH 3.6'' LCD Zigbee Temperature And Humidity Sensor

Introduction

The SONOFF AirGuard TH (SNZB-02DR2) is a Zigbee LCD temperature and humidity sensor designed for comprehensive indoor climate monitoring. It features a 3.6-inch large display that provides real-time temperature, humidity, and 24-hour extreme values. The device can also display data from remote sensors when linked in Zigbee mode. Data can be monitored via the eWeLink App, offering advanced analytics including dew point and VPD curves for air quality insights. It supports adjustable reporting intervals and integrates with popular smart home platforms like Alexa, Google Home, and SmartThings for voice control, as well as open-source platforms like Home Assistant.

Setup Instructions

1. Initial Setup (Zigbee Mode)

1. **Download the eWeLink App**: Search for "eWeLink" in your smartphone's app store (Google Play or Apple App Store) and install it.
2. **Power On Device**: Insert two AAA batteries into the sensor.
3. **Add Device**: Open the eWeLink App. Ensure your Zigbee hub is powered on and connected to the app.
4. **Scan QR Code**: In the eWeLink App, follow the prompts to add a new device. You may need to scan the QR code located on the sensor or its packaging.
5. **Select Zigbee Hub**: Choose the compatible SONOFF Zigbee hub you wish to connect the sensor to within the app.
6. **Device Discovery**: Wait for the hub to find and connect to the SNZB-02DR2 sensor. This process may take a few moments.

2. Proximity Mode (No Gateway Required)

For direct monitoring without a Zigbee hub, you can use the 'Proximity Mode' to connect the device directly to your phone via Bluetooth. This mode allows real-time temperature and humidity monitoring and analytics within communication range.

• **Features in Proximity Mode**: Temperature & Humidity Monitoring, Comfort Settings, Temperature & Humidity Calibration, °C/°F Switch, Data Storage & Export.
• **Note**: Once the device is connected to a Zigbee gateway, Proximity Mode will be disabled. Switching modes will restore the device to factory settings.

Operating Instructions

1. LCD Display Overview

The 3.6-inch LCD screen provides a clear overview of environmental conditions:

• **Current Temperature**: Displays the real-time temperature.
• **Current Humidity**: Displays the real-time relative humidity.
• **Max/Min Temperature of the Day**: Shows the highest and lowest temperatures recorded in the last 24 hours.
• **Max/Min Humidity of the Day**: Shows the highest and lowest humidity levels recorded in the last 24 hours.
• **Comfort Level Signal**: An icon indicating the current comfort level based on temperature and humidity.

2. App Monitoring and Advanced Analytics

Through the eWeLink App, you can remotely monitor and analyze data from your AirGuard TH sensor:

• **Real-time Monitoring**: View live temperature and humidity readings from anywhere.
• **24-Hour Real-Time Data**: Access per-minute updates and historical data for the last 24 hours.
• **6-Month History Record**: Review temperature and humidity trends over a longer period with max/min/average curves.
• **Dew Point & VPD Insights**: Gain quantitative insights into air quality, helping to prevent mold and manage moisture.
• **Smart Scene Triggers**: Set custom thresholds for temperature or humidity to automatically trigger smart scenes (e.g., turn on a fan or humidifier) and receive instant alerts on your phone.

3. Remote Temperature Display (Zigbee Mode)

When connected to a Zigbee gateway, the AirGuard TH can link with other SONOFF SNZB-02 series sensors (SNZB-02/02P/02WD/02D/02LD) to display their readings directly on its screen. This allows for quick checks of conditions in other rooms or areas without needing to open the app.

4. Voice Control Integration

Integrate your AirGuard TH with voice assistants for convenient control and status checks:

• **Alexa**: Ask Alexa for temperature readings (Note: Amazon Alexa platform currently does not support humidity features for this device).
• **Google Home**: Query Google Home for temperature and humidity information.
• **SmartThings**: Connect to SmartThings for integrated voice commands.

5. Platform Integration

• **Apple Home via Matter Bridge**: Integrate SONOFF Zigbee devices into your Apple ecosystem for seamless control. This can be achieved through Matter-Certified Hardware (e.g., ZBBridge-U, iHost, NSPanel Pro powered by eWeLink CUBE) or by installing free self-hosted software (e.g., ZB Dongle connected to Raspberry Pi, Virtual Machines, NAS device with eWeLink CUBE).
• **Open-Source Platforms**: Integrate your devices into platforms like Home Assistant using SONOFF Dongle Series to create customized temperature control solutions.

Maintenance

1. Battery Replacement

The AirGuard TH is powered by two AAA batteries. When the battery indicator on the LCD or in the app shows low power, replace both batteries with new ones to ensure continuous operation.

2. Cleaning

To clean the sensor, gently wipe the exterior with a dry, soft cloth. Do not use liquid cleaners or immerse the device in water.

Troubleshooting

• **Device Not Connecting to Hub**: Ensure your Zigbee hub is powered on, within range, and properly configured in the eWeLink App. Try re-pairing the device by following the setup instructions.
• **Inaccurate Readings**: Verify the sensor is placed in an appropriate location, away from direct sunlight, drafts, or heat sources that could affect readings. If using Proximity Mode, ensure your phone is within Bluetooth range. Consider performing a calibration if available in the app settings.
• **Proximity Mode Disabled**: If you previously used Proximity Mode and then connected the device to a Zigbee gateway, Proximity Mode will be disabled. To re-enable it, you will need to factory reset the device.
• **Remote Temperature Display Not Working**: Ensure all sensors are connected to the same Zigbee gateway and that the gateway firmware is up to date.

Specifications

User Tips

• For optimal accuracy, place the sensor in a central location within the room, away from direct sunlight, heating/cooling vents, or open windows.
• Regularly check the eWeLink App for firmware updates to ensure your device has the latest features and performance improvements.
• Utilize the smart scene automation features in the eWeLink App to create a comfortable environment automatically, such as turning on a humidifier when humidity drops below a certain level.
• If you experience connectivity issues, try moving the sensor closer to your Zigbee hub or phone (if using Proximity Mode).

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.