1. Introduction
The SINOTIMER WDS688 is a smart single-phase energy meter designed for household use, offering real-time energy monitoring and remote control capabilities via Wi-Fi. This device allows you to manage your home appliances efficiently and track electricity consumption through a mobile application.
Key Features:
- Remote ON/OFF control via Tuya APP or Smart Life APP.
- Calculation of total energy consumption (kWh).
- Real-time display of Voltage, Current, Power, and total Energy (kWh) on an LCD screen.
- Scheduling and timer functions with 30 different timer models.
- Easy installation on a 35mm DIN rail.

2. Specifications
| Parameter | Value |
|---|---|
| Power Supply | 90-250V AC 50/60Hz |
| Rated Current | 60A |
| Pulse Frequency | 1200imp/kWh |
| Installation | 35mm Din Rail |
| Display | LCD (Voltage, Current, Power, total Energy kWh) |
| Connectivity | Wi-Fi (Tuya/Smart Life APP) |
| Color | White |
| Material | ABS |
| Dimensions | 81x36x66mm |

3. Package Contents
Please check the package for the following items:
- 1 x SINOTIMER WDS688 Smart Energy Meter
- 1 x Installation Kit
4. Installation
4.1 Safety Precautions
- Ensure power is OFF before installation to prevent electric shock.
- Installation should be performed by a qualified electrician or a knowledgeable individual.
- Follow local electrical codes and regulations.
4.2 Din Rail Mounting
The WDS688 energy meter is designed for 35mm DIN rail installation. Simply clip the device onto the DIN rail in your electrical panel.
4.3 Wiring Instructions
Connect the live (L) and neutral (N) wires according to the diagram below. Ensure correct input and output connections.
- L in: Live wire input
- N in: Neutral wire input
- L out: Live wire output to load
- N out: Neutral wire output to load

5. Initial Setup and App Pairing
5.1 Download the Mobile App
The SINOTIMER WDS688 works with either the Tuya Smart or Smart Life mobile application. Download the app from your smartphone's app store (Google Play Store for Android or Apple App Store for iOS).
5.2 Power On and Pairing Mode
- After successful wiring, turn on the main power supply. The energy meter's LCD screen should light up.
- Press and hold the "Pair" button on the energy meter until the Wi-Fi indicator starts blinking rapidly. This indicates the device is in pairing mode.
5.3 Add Device in App
- Open the Tuya Smart or Smart Life app on your smartphone.
- Register or log in to your account.
- Tap the "+" icon (usually in the top right corner) to add a new device.
- Select "Electrical" or "Energy Meter" from the device categories.
- Follow the on-screen instructions to connect the meter to your home Wi-Fi network. Ensure your phone is connected to a 2.4GHz Wi-Fi network during pairing.
- Once connected, the Wi-Fi indicator on the meter will stop blinking and remain solid.
6. Operation
6.1 Real-time Energy Monitoring
Once paired, you can view real-time energy data directly from the mobile app. The app displays:
- Today's KWH consumption
- Total KWH consumption
- Real-time Current (Amperes)
- Real-time Voltage (Volts)
- Real-time Power (Watts)
- Historical consumption data (e.g., monthly, yearly)

6.2 Remote Control ON/OFF
The app allows you to remotely turn connected appliances ON or OFF with a single tap, providing convenient control from anywhere.

6.3 Schedule and Timer Functions
Utilize the scheduling and timer features to automate your appliances and optimize energy usage. You can set up to 30 different timer models.
- Schedule: Set specific times for appliances to turn on or off (e.g., automatically turn on your water heater before you go home every day).
- Timer: Set a countdown timer for appliances to turn off after a certain duration (e.g., automatically turn off your air conditioning after you go to sleep).
- Energy Saving Automation: For example, automatically turn on and turn off fish tank oxygen production to save energy.

7. User Tips
- Wi-Fi Stability: Ensure your Wi-Fi network is stable and within range of the energy meter for consistent connectivity and accurate data reporting.
- App Updates: Regularly update the Tuya Smart or Smart Life app to benefit from the latest features and security enhancements.
- Energy Habits: Use the monitoring data to identify high-consumption periods and adjust your appliance usage or schedule timers to save energy.
- 2.4GHz Network: Remember that most smart home devices, including this energy meter, require a 2.4GHz Wi-Fi network for initial setup.
8. Troubleshooting
8.1 Device Not Powering On
- Check all wiring connections (L in, N in) to ensure they are secure and correct.
- Verify that the main power supply is turned ON.
- Ensure the input voltage is within the specified range (90-250V AC).
8.2 Unable to Connect to Wi-Fi / App
- Ensure your smartphone is connected to a 2.4GHz Wi-Fi network during the pairing process.
- Make sure the energy meter is in pairing mode (Wi-Fi indicator blinking rapidly). If not, press and hold the "Pair" button.
- Check your Wi-Fi password for accuracy.
- Move the energy meter closer to your Wi-Fi router if signal strength is weak.
- Restart your Wi-Fi router and try pairing again.
8.3 Inaccurate Readings
- Double-check the wiring to ensure L and N inputs/outputs are correctly connected and not reversed.
- Ensure the connected load does not exceed the rated current of 60A.
8.4 Remote Control Not Responding
- Verify that the energy meter is connected to Wi-Fi (solid Wi-Fi indicator).
- Check your internet connection on your smartphone.
- Ensure the app is up to date.
9. Maintenance
- Keep the device clean and free from dust. Use a soft, dry cloth for cleaning.
- Avoid exposing the device to extreme temperatures, humidity, or direct sunlight.
- Do not attempt to open or repair the device yourself, as this will void the warranty and may pose a safety risk.
10. Warranty and Support
For warranty information and technical support, please refer to the seller's policies or contact the manufacturer directly. Keep your purchase receipt as proof of purchase.





