Introduction
The ECOWITT WN31 (also known as WH31) is a wireless multi-channel temperature and humidity sensor designed for indoor monitoring. It provides real-time temperature and humidity readings, which can be viewed directly on its LCD display or remotely via a compatible Wi-Fi gateway and mobile application. This manual provides detailed instructions for the setup, operation, and maintenance of your WN31 sensor.
Product Overview
Image: Front view of the ECOWITT WN31 sensor, displaying temperature and humidity on its LCD screen.
The WN31 sensor measures both temperature and humidity. It features an LCD display for local readings and can transmit data wirelessly to a compatible ECOWITT Wi-Fi gateway (sold separately) for remote monitoring through the WS View Plus/Ecowitt APP. The sensor supports up to 8 channels, allowing you to monitor multiple locations with additional WN31 sensors.
- Wireless Connectivity: Operates on a 915 MHz RF frequency (for US/CA regions).
- Multi-Channel Support: Monitor up to 8 distinct locations with additional WN31 sensors.
- LCD Display: Provides immediate temperature and humidity readings.
- Remote Monitoring: Requires an ECOWITT Wi-Fi gateway (e.g., GW1100, HP2551, WH2680, WN1900) for app integration and online data access.
- Power Source: Requires 2 AA batteries (not included).
Setup
1. Battery Installation
- Open the battery compartment cover on the back of the WN31 sensor.
- Insert two (2) AA batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
2. Channel Configuration and Temperature Unit Selection
The WN31 sensor features dip switches inside the battery compartment to customize the channel number and select the temperature unit (Celsius or Fahrenheit).
Image: Diagram illustrating the dip switch settings for channel selection (CH1-CH8) and temperature unit (℃/℉).
- Channel Number (1st to 3rd Dip Switches): Adjust these switches to set the desired channel number (1-8) for your sensor. This is crucial when using multiple WN31 sensors to avoid interference and identify data from specific locations.
- Temperature Unit (4th Dip Switch): Toggle the 4th dip switch to select between Celsius (℃) and Fahrenheit (℉).
After adjusting the dip switches, the sensor will display the selected channel and temperature unit on its LCD.
3. Gateway Pairing (Optional, for Remote Monitoring)
To view sensor data on your mobile application or the Ecowitt Weather Server, the WN31 sensor must be paired with a compatible ECOWITT Wi-Fi gateway (e.g., GW1100, HP2551, WH2680, WN1900). These gateways are sold separately.
Image: The WN31 sensor wirelessly transmitting data to an ECOWITT GW1000 Wi-Fi Gateway, with live data displayed on a mobile application.
Refer to the quick start guide provided with your specific ECOWITT Wi-Fi gateway for detailed Wi-Fi configuration and pairing procedures. Once configured, the sensor data will be streamed to the gateway and become accessible via the WS View Plus/Ecowitt APP.
4. Mounting the Sensor
The WN31 sensor can be mounted in various ways to suit your monitoring needs. It is designed primarily for indoor use.
Image: Illustrations demonstrating how to mount the WN31 sensor using a screw or by hanging it.
Choose a location that provides accurate readings for the area you wish to monitor. Avoid placing the sensor in direct sunlight, near heat sources, or in areas with high airflow that could skew readings.
Operation
1. LCD Display Readings
The WN31 sensor features an LCD screen that displays the current temperature and humidity. The selected channel number is also shown.
Image: Detailed view of the WN31 LCD display, indicating temperature (e.g., 82.5℉), humidity (e.g., 49% RH), and channel (e.g., CH3).
2. Remote Monitoring via Mobile Application
Once paired with an ECOWITT Wi-Fi gateway, you can monitor the WN31 sensor's data remotely using the WS View Plus or Ecowitt APP on your smartphone or tablet. The app allows you to view live data, historical graphs, and manage multiple sensors.
Image: Screenshots of the mobile application displaying multi-channel temperature and humidity readings, along with historical data graphs for specific channels.
3. Ecowitt Weather Server and Email Alerts
The ECOWITT system supports uploading data to the free Ecowitt Weather Server (ecowitt.net). On this platform, you can view data graphs, download historical records, and set up email alerts for all your connected sensors. This feature is particularly useful for monitoring conditions in areas like freezers or basements and receiving notifications if thresholds are exceeded.
4. Supported Platforms
The ECOWITT system integrates with various weather platforms, allowing you to share and view your weather data through different services.
Image: Visual representation of various weather platforms compatible with ECOWITT devices, including Ecowitt.net, Weather Underground, Met Office, and Weathercloud.
Maintenance
- Battery Replacement: When the battery indicator on the LCD display or in the app shows low power, replace both AA batteries with new ones. Ensure correct polarity.
- Cleaning: Wipe the sensor with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
- Environmental Protection: The WN31 is designed for indoor use. While it can tolerate some outdoor conditions, it is not fully waterproof. Avoid exposing the sensor to direct rain or excessive moisture to prevent damage, especially to the hygrometer component.
Troubleshooting
1. No Readings on LCD or App
- Check Batteries: Ensure batteries are correctly installed and not depleted. Replace if necessary.
- Gateway Connection: If using the app, verify that your Wi-Fi gateway is powered on, connected to your network, and properly paired with the WN31 sensor. Refer to your gateway's manual for troubleshooting its connection.
- Sensor Range: Ensure the sensor is within the wireless range of your gateway. Obstacles like thick walls or metal structures can reduce range.
2. Inaccurate Readings
- Sensor Placement: Ensure the sensor is not in direct sunlight, near heat sources (e.g., vents, appliances), or in areas with extreme drafts, which can affect accuracy.
- Moisture Exposure: If the sensor has been exposed to water, the humidity readings may become inaccurate or the sensor may fail.
3. WN31 vs. WN32 Sensor Differences
It is important to understand the distinctions between the WN31 and WN32 sensors, as they are designed for different applications:
| Feature | WN31 (WH31) | WN32 |
|---|---|---|
| Channels | 8-channel temp-hygrometer sensor | Single channel sensor |
| Recommended Use | Indoors (e.g., storage rooms, freezers) | Outdoors |
| Additional Data | Does not provide "feels like" or "Dew Point" data | Provides "feels like" and "Dew Point" data |
| App Module Display | Displayed on "Temp and Humidity CHX" module (X=1-8) | Displayed on "Outdoor" module |
4. RF Frequency Compatibility
The WN31 (WH31) Thermometer & Hygrometer operates on a specific RF frequency. For devices sold in the US/CA, the frequency is 915 MHz. Ensure that any other ECOWITT products you intend to pair with this sensor also operate on the same frequency (e.g., 915 MHz for US/CA, 868 MHz for Europe, 433 MHz for Australia).
Specifications
| Specification | Detail |
|---|---|
| Model Number | WN31 |
| Product Dimensions | 1.97 x 1.97 x 5.12 inches |
| Item Weight | 2.47 ounces |
| Power Source | 2 AA batteries (not included) |
| Connectivity Technology | Wireless (915 MHz for US/CA) |
| Special Feature | High Accuracy |
| Material | Plastic |
| Recommended Uses | Indoor use |
Warranty and Support
For warranty information, technical support, or further assistance with your ECOWITT WN31 sensor, please visit the official ECOWITT website or contact their customer service. Keep your purchase receipt for warranty claims.
Official ECOWITT Store: ECOWITT Amazon Store
