1. Introduction
This manual provides detailed instructions for the setup, operation, and maintenance of your Tuya Zigbee 3.0 Temperature & Humidity Sensor, Model ZTH03. This device is designed to monitor indoor environmental conditions and integrate seamlessly into your smart home ecosystem via a Zigbee hub.
Important Notes:
- This sensor is a Tuya Zigbee solution and cannot connect directly to Wi-Fi.
- It requires a Tuya Zigbee Hub or a Tuya Multi-Mode Gateway to function.
- The sensor has been successfully tested with Alexa (via Zigbee Hub) and Yandex Zigbee Hub.
2. Safety Information
- Keep the device away from water and high humidity environments.
- Do not attempt to disassemble or repair the device yourself.
- Use only the specified battery type (CR2032).
- Keep batteries out of reach of children.
- Dispose of batteries and the device according to local regulations.
3. Package Contents
- 1 x Tuya Zigbee 3.0 Temperature & Humidity Sensor (Model ZTH03)
- 1 x CR2032 Battery (pre-installed)
4. Specifications
| Parameter | Value |
|---|---|
| Model | ZTH03 |
| Wireless Type | Zigbee 3.0 (IEEE 802.15.4) |
| Power Supply | CR2032 (Installed) |
| Working Voltage | DC2.5V-3V |
| Temperature Measure Range | -9.9℃ ~ 60℃ (14.18°F ~ 140°F) |
| Temperature Measure Accuracy | ±1℃ |
| Humidity Measure Range | 0%RH ~ 99%RH |
| Humidity Measure Accuracy | ±5%RH |
| Size | 43mm x 43mm x 10mm |
| Material | ABS |
For visual reference of dimensions and parameters:
Image: Product dimensions (43x43x10mm) and detailed specifications table.
5. Setup
5.1. Prerequisites
Before setting up the sensor, ensure you have the following:
- A smartphone with the Tuya Smart or Smart Life app installed.
- A Tuya Zigbee Hub or Tuya Multi-Mode Gateway. The sensor communicates via Zigbee protocol and cannot connect directly to Wi-Fi.
5.2. Physical Installation
The sensor offers multiple placement options:
- Place it on a table or shelf.
- Attach it to a wall using adhesive (not included).
- Hang it on a door (hanging rope not included).
Recommended Installation Location:
Install the sensor in an open location to ensure optimal Zigbee signal transmission. Avoid placing it inside closed metal boxes or areas with significant signal interference.
Image: Examples of sensor placement on a table, wall, and hanging.
5.3. App Pairing
Follow these general steps to pair your sensor with the Tuya Smart or Smart Life app:
- Ensure your Tuya Zigbee Hub is powered on and connected to your home network.
- Open the Tuya Smart or Smart Life app on your smartphone.
- Navigate to your Zigbee Hub in the app and select 'Add sub-device' or 'Add device'.
- Follow the on-screen instructions to put the sensor into pairing mode (usually involves pressing a reset button on the sensor).
- Once detected, name your sensor and assign it to a room.
Remote Monitoring Diagram:
Image: Data flow diagram illustrating how the sensor connects to the app through a Zigbee Hub and Tuya Cloud Services.
6. Operation
6.1. Display Overview
The sensor features an LCD display showing current temperature and humidity. It also includes an intuitive comfort indicator (smiley/sad face) to quickly assess the indoor environment.
Image: Explanation of the intuitive comfort indicator based on temperature and humidity ranges.
6.2. App Remote Monitoring
Once paired, you can monitor the indoor temperature and humidity in real-time from anywhere using the Tuya Smart or Smart Life app on your smartphone.
Image: App interface showing remote monitoring of temperature and humidity.
6.3. Temperature & Humidity Records
The app allows you to view historical data curves for temperature and humidity. You can browse records by days, months, or years and export this data to your email address.
- Historical data is stored for 7 days.
- The minimum granularity for daily charts and exported data is 1 hour.
- Historical values represent the average value over the minimum granularity time.
Image: App interface for viewing and exporting historical temperature and humidity data.
6.4. Temperature & Humidity Alarm
You can set custom temperature and humidity ranges within the app's 'Scene' page. If the environmental conditions exceed or fall below these preset ranges, you will receive an alarm notification on your mobile device.
Image: App interface for setting temperature and humidity alarms.
6.5. Fahrenheit (°F) and Celsius (°C) Switch
The temperature unit displayed on the sensor can be switched between Fahrenheit and Celsius by double-clicking the reset button on the device. Note that the unit displayed on the sensor does not sync with the unit setting in the app; the app's display unit is configured independently within the app settings.
Image: Comparison of sensor display in Celsius and Fahrenheit, with unit switching instructions.
6.6. Low Battery Reminder
When the CR2032 battery power is low, the sensor will send an alarm message via the app, reminding you to change the battery.
Image: Visual representation of the low battery reminder feature.
6.7. Intelligent Linkage (Automation)
The sensor can be used to create smart automation routines within the Tuya Smart or Smart Life app. For example, you can set rules to automatically turn on/off an air conditioner or humidifier based on specific temperature or humidity thresholds detected by the sensor.
Note: For intelligent linkage, other connected devices (e.g., smart IR remote, humidifier) must also be Tuya-compatible products and managed under the same account.
Image: Example of temperature-based automation for an air conditioner.
Image: Example of humidity-based automation for a humidifier.
7. Maintenance
7.1. Battery Replacement
When the low battery reminder is received via the app, replace the CR2032 battery. Refer to the device's casing for instructions on how to open the battery compartment.
7.2. Cleaning
Wipe the sensor with a soft, dry cloth. Do not use liquid cleaners or abrasive materials, as these may damage the device.
8. Troubleshooting
- Q: Why can't I see the screen clearly after tilting?
- A: The screen has an optimal viewing angle of 50°. Viewing from other angles may reduce clarity. This is a characteristic of this type of display.
- Q: Why does the network testing function on the device properties page always fail?
- A: To conserve battery life, the sensor enters a sleep mode when not actively reporting data. The network testing function requires continuous online status and power consumption, which is not feasible for a battery-powered device. The sensor will automatically wake up and report data when temperature/humidity changes exceed the set value or at fixed intervals.
- Q: Why does the device display 'Device is unresponsive' when configured directly with Alexa (with Zigbee Hub)?
- A: This is a known issue with Alexa's implementation for battery-powered Zigbee devices. Alexa may require the sensor to send a message every 10 minutes to maintain an active status, which is too frequent for battery products and impacts battery life. Other Zigbee 3.0 gateways typically do not have this issue.
- Q: Why do other third-party gateways display very simply?
- A: The display and content within third-party gateway apps are controlled by those third parties. We recommend using Tuya's Zigbee gateway for the most comprehensive display and functionality.
- Q: What are the expected errors for temperature and humidity readings?
- A: All temperature and humidity sensors have inherent errors. For this sensor, the temperature error is ±1℃, and the humidity error is ±5%RH. Readings within these ranges are considered normal. Allow 30 minutes to 1 hour for the sensor to acclimate to room temperature for accurate measurements.
- Q: How often does the sensor update data?
- A: The sensor uses a trigger mechanism. It reports data immediately when temperature or humidity changes reach a set value. Otherwise, data is generally updated once an hour. The sensor's update frequency cannot be manually set, nor can alarms be set directly on the sensor itself (alarms are configured in the app).
- Q: Can I use this sensor with third-party smart speakers like Google Home or Amazon Alexa?
- A: Yes, voice query functions are supported to ask for current temperature and humidity. However, third-party smart speaker apps typically do not have dedicated control panels for temperature and humidity sensors, so they may not display the data correctly. Also, automation processes related to temperature and humidity cannot usually be established directly through third-party smart speaker apps.
- Q: How does the trigger mechanism for automation work?
- A: The sensor uses an 'Edge Triggered' (ET) mechanism. This means an action is only triggered if the condition *crosses* the set threshold. For example, if you set an automation to turn on a light when the temperature is greater than 25℃, the light will only turn on when the temperature rises from below 25℃ to 25℃ or higher. If the temperature is already above 25℃ when the automation is set, the light will not turn on until the temperature drops below 25℃ and then rises above it again.
9. User Tips
- Always ensure your Zigbee Hub is online and functioning correctly for the sensor to report data.
- For optimal performance, place the sensor in a central, open location away from direct sunlight, drafts, or heat sources that could skew readings.
- If you require more frequent or real-time data updates, consider purchasing a USB-powered version of a temperature and humidity sensor (e.g., models TH06/TH16), as battery-powered sensors prioritize battery life over constant reporting.
- Familiarize yourself with the app's 'Scene' functionality to leverage the sensor's automation capabilities fully.
10. Warranty and Support
For warranty information and technical support, please refer to the seller's policies or contact the retailer where the product was purchased. Keep your proof of purchase for any warranty claims.