1. Overview
The UNI-T UT334E+ is a portable, voice-type four-in-one gas detector designed for continuous detection of harmful gas concentrations. It utilizes advanced integrated circuit technology and high-quality gas sensors, offering excellent sensitivity and repeatability. The device supports both Chinese and English interfaces and voice prompts, making it user-friendly and easy to maintain. Its shell is constructed from high-strength engineering plastic, ensuring durability and good vibration resistance.
The UT334E+ is based on the principles of electromagnetic induction and eddy current measurement. It can measure non-conductive or conductive coatings on magnetically permeable metals (Fe) and non-conductive coatings on non-magnetic metals (NFe). This makes it an essential tool for various industries including automobile manufacturing, metal processing, painting, inspection, aeronautics, space, shipping, bullet trains, scientific research, and quality supervision.
Key Features:
- Detects Oxygen (O2), Carbon Monoxide (CO), Hydrogen Sulfide (H2S), and Combustible Gases.
- High-quality sensitive sensors for accurate detection.
- 2.0-inch black and white screen with backlight.
- Multiple alarm methods: sound, alarm light, and vibration.
- Automatic storage of alarm records.
- Supports Chinese/English language switching.
- Power-on self-test and explosion-proof certification (CNEx23.3970X).
- Powered by a 3.7V 2000mAh lithium battery.
- Back clip design for easy portability.
Video: UNI-T UT334E+ Multi Gas Detector product demonstration, showcasing features like multiple alarms, portability, charging, and application scenarios.
2. Safety Instructions
- Initialization self-test is required when the gauge is powered on. Do not place the sensor near metal objects during power-on to avoid malfunction.
- Keep the sensor clean and in good condition, free from dust, oil, and other factors that could affect measurement accuracy.
- Do not use or store the gauge in high temperature, high humidity, flammable, explosive, or strong magnetic field environments.
- Clean the gauge casing with a soft cloth and mild detergent. Avoid abrasives or solvents to prevent damage.
- Do not disassemble or modify the gauge.
- When the LCD displays the low battery symbol, charge the product promptly.
- To prevent fire, use the original USB cable for charging or data communication and disconnect it after use.
- Do not irradiate the flashlight directly into eyes.
- When using Bluetooth communication, maintain a distance of less than 10 meters between the device and the mobile terminal, without obstacles or metal shielding.
- Standard coating thickness sheets and metal matrixes are high-precision accessories; preserve them properly to prevent scratches, corrosion, bending, or deformation.
3. Product Structure and Components
Familiarize yourself with the different parts of your UT334E+ Multi Gas Detector:
Figure 1: Front and Rear View of UT334E+ with labeled components.
Component List:
- LED Alarming Light
- LCD Display
- Power/Flashlight Button
- Confirm/Menu Button
- Repeal/Delete Button
- Subtract/Automobile Mode Button
- Add/Histogram Button
- Sensor Module
- Hand Strap Buckle
- USB/Charging Interface
- Flashlight
- Loudspeaker
4. Specifications
4.1 Technical Indexes
Figure 2: Technical Specifications Table.
| Function | Range | Resolution | Accuracy | Description |
|---|---|---|---|---|
| Gas Detection (O2, CO, H2S, Combustible) | O2: 0-30% VOL CO: 0-1000PPM H2S: 0-100PPM Combustible: 0-100% LEL | O2: 0.1% VOL CO: 1PPM H2S: 1PPM Combustible: 1% | ±3% FS (O2) ±5% FS (Combustible) ±10% (CO, H2S) | |
| Screen Display | Black and white screen | |||
| Sampling Method | Diffusion type | |||
| Response Time | T≤60s | |||
| Backlight | √ | |||
| Alarm Record | √ | |||
| Audible Alarm | √ | |||
| LED Alarm | √ | |||
| Vibration Alarm | √ | |||
| Explosion Proof Sign | Exib IIB T3 Gb | |||
| Operation Temperature | -20~50℃ | |||
| Working Humidity | Humidity<95% RH without condensation | |||
| Power Supply | DC3.7V (lithium battery capacity 2000mAh) |
4.2 General Specifications
| Feature | Description |
|---|---|
| Display | 2" color TFT screen |
| Refresh Rate | 0.5s |
| Sensor Type | Large range composite sensor |
| Impact Resistance | Can withstand 1 meter drop |
| Power | 5VDC 1A power adapter (USB interface) |
| Product Size | 152×65×35mm |
| Weight | About 180g (including battery) |
4.3 Product Standard Accessories
Figure 3: Product Standard Accessories.
- UT334E+ Host (1 pc)
- Toolbox (1 pc)
- Color Box (1 pc)
- Charging Head (1 pc)
- USB Charging Cable (1 pc)
- Standard Air Hood (1 pc)
- Instruction Manual (1 pc)
- Factory Test Report (1 pc)
- Explosion-Proof Certificate (1 pc)
- Certificate of Conformity and Warranty Card (1 pc)
5. Setup
5.1 Initial Charging
Before first use, or when the low battery symbol appears on the LCD, connect the device to a 5VDC 1A power adapter using the provided USB cable to charge it. Ensure the device is fully charged for optimal performance. The device can support mobile power supply for charging.
Figure 4: Charging the UT334E+.
6. Operating Instructions
6.1 Power On/Off
- To power on the gauge, long press the Power/Flashlight button. The device will perform an initialization self-test and enter the main interface.
- To power off the gauge, long press the Power/Flashlight button again.
6.2 Measurement
Keep the probe away from metal objects before turning on the product.
- Power on the device. It will enter the main interface after initialization.
- If the product has not been used for a long time or the operating environment has changed, a two-point calibration is recommended before use.
- Press the probe vertically on the object to be measured. The value displayed on the LCD is an estimated coating thickness.
- Based on this estimated value, select a standard coating thickness sheet closest to this value from the accessories for two-point calibration.
- Select a matrix with thickness or material close to the measured object and without coating as the calibration matrix. If not available, use the standard matrix in the accessories (note: material/thickness differences may bias results).
- Refer to the calibration section for the two-point calibration method.
- After successful two-point calibration and verification, the coating thickness of the object can be measured.
- When measuring, select 3 to 5 measuring points on the surface of the object evenly. Measure 5 times for each point and take the average value as the indicating value.
- After measuring 3 to 5 points, average their indicating values for the final reference value.
6.3 Menu Navigation
From the main interface, short press the Confirm/Menu button to open the menu.
6.3.1 Auto Rotate Screen
In the menu, use the navigation buttons to select the auto rotate screen icon, then short press Confirm/Menu. Select to turn on/off the auto rotate function and confirm. The gauge has a built-in gravity sensor for multi-angle reading (0°, 90°, 180°, and 270°). If auto-rotate is off, an icon will be displayed in the upper right corner.
6.3.2 Length Unit
In the menu, select the length unit icon (µm/mil), then short press Confirm/Menu. Select µm or mil and confirm.
6.3.3 Probe Mode
In the menu, select the probe mode icon (Mode), then short press Confirm/Menu. Select automatic, NFe, or Fe mode and confirm.
- Automatic mode: Automatically identifies the matrix type (Fe or NFe) and enters the corresponding operating mode.
- Fe mode: Sensor enters electromagnetic induction operating mode.
- NFe mode: Sensor enters eddy current operating mode.
6.3.4 Data Storage Location
In the menu, select the data storage location icon (Group), then short press Confirm/Menu. Select the group number (55 groups available, 60 data per group) and confirm.
Figure 5: Data Storage Interface.
6.3.5 Continuous Measurement
In the menu, select the continuous measurement icon, then short press Confirm/Menu. Select to turn on/off continuous measurement mode and confirm. When enabled, the product measures continuously until turned off.
6.4 Calibration
From the main interface, long press the Confirm/Menu button to enter the selected calibration mode. The selected mode depends on the setting in Probe Mode.
6.4.1 Zero-Point Calibration
- Place the gauge vertically on the uncoated matrix.
- Lift the gauge after 2 seconds. The screen will display 0.0, and the gauge automatically returns to the main interface.
- Zero-point calibration is complete.
6.4.2 Two-Point Calibration
- Stack the standard coating thickness sheet (e.g., 500µm) and uncoated matrix together for calibration.
- Place the gauge vertically on the stacked sheets.
- Lift the gauge after 2 seconds. The measured value will show on the screen.
- Adjust the measured value to match the thickness value of the standard coating thickness sheet using the navigation buttons.
- Press Confirm/Menu to confirm or Repeal/Delete to cancel.
- Place the gauge vertically on the uncoated matrix.
- Lift the gauge after 2 seconds. The screen will display 0.0, and the gauge automatically returns to the main interface.
- Two-point calibration is complete.
6.4.3 Calibration Verification
In the main interface, measure the thickness of the standard coating thickness sheet. The measured value should be within the error range of the nominal value of the standard coating thickness sheet. If the gauge is inaccurate, recalibrate or perform a factory reset.
6.5 Quick Test Mode
From the main interface, long press the Subtract/Automobile Mode button to enter quick test mode. Use navigation buttons to select single point or multi-point test, then short press Confirm/Menu to confirm.
6.5.1 Single Point Quick Test
- Set the target thickness value and confirm.
- Set the tolerance and confirm.
- Measure the coating thickness of the object.
- The screen will immediately display the measured value and the test result ("PASS" or "FAIL").
- Short press Repeal/Delete to return or long press to exit.
6.5.2 Multi-Point Quick Test
- Set the target thickness value and confirm.
- Set the tolerance and confirm.
- Measure the coating thickness of the object. Take 3 measurements near the same position; the gauge will calculate the average as the value of point A.
- Repeat for points B, C, D, and E.
- After all measurements, the screen displays the average value of these 5 points and the test result ("PASS" or "FAIL").
- Short press Repeal/Delete to return or long press to exit.
6.6 Alarm Settings
Figure 6: Multiple Alarm Methods.
6.6.1 Upper Limit and Lower Limit Alarms
In the menu, select the upper limit icon or lower limit icon, then short press Confirm/Menu. Adjust the value using navigation buttons and confirm. The LED light flashes yellow if the measured value is higher than the upper limit, and red if lower than the lower limit. It flashes green if within limits.
6.6.2 LED Alarm
In the menu, select the LED alarm icon, then short press Confirm/Menu. Select to turn on/off the LED alarm and confirm.
6.6.3 Voice Broadcast
In the menu, select the voice broadcast icon, then short press Confirm/Menu. Select to turn on/off the voice broadcast function and confirm.
6.6.4 Audible Alarm (Buzzer)
In the menu, select the buzzer icon, then short press Confirm/Menu. Select to turn on/off the buzzer and confirm. When enabled, the gauge will beep upon measurement.
6.7 Backlight Brightness
In the menu, select the backlight brightness icon, then short press Confirm/Menu. Adjust the brightness using navigation buttons and confirm.
6.8 Bluetooth APP and PC Software
Users can download the APP from Uni-Trend's official website or APP Store. For PC software, refer to the installation instructions to download and install. Connect the USB cable to the computer to send real-time data or save stored data and generate reports. Note: If there is no Bluetooth connection for 5 minutes, the function will automatically turn off.
6.9 Flashlight
In the main interface, short press the Power/Flashlight button once to turn on/off the flashlight in the rear of the gauge.
7. Maintenance
- Regularly clean the sensor to ensure accurate readings.
- Wipe the device casing with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners.
- Store the device and its accessories (standard sheets, matrixes) in a clean, dry environment to prevent damage, scratches, rust, or oxidation.
- Avoid exposing the device to extreme temperatures or humidity.
8. Troubleshooting
- Inaccurate Readings: If the gauge provides inaccurate readings after multiple calibration attempts, perform a factory reset. In the menu, select the restore factory settings icon and confirm.
- Device Unresponsive: Ensure the battery is charged. If the device is still unresponsive, try performing a factory reset.
- Bluetooth Connectivity Issues: Ensure the device is within 10 meters of the mobile terminal and there are no obstructions. The Bluetooth function will automatically turn off if no connection is made for 5 minutes.
- Over Range (OL) Indication: If the measured value exceeds 2000µm, the screen will display 'OL'. The gauge will not respond if the value exceeds 2200µm.
9. User Tips
- Always ensure the sensor is clean and free of debris before taking measurements to maintain accuracy.
- For critical measurements, perform a two-point calibration using the provided standard sheets and an uncoated matrix that closely matches the material and thickness of your test object.
- Utilize the back clip for hands-free operation in industrial environments, allowing for easy portability and quick access.
- Take multiple measurements at different points on the surface and average them for more reliable results, especially in quick test mode.
10. Warranty and Support
Limited Warranty and Liability
Uni-Trend guarantees that this product is free from any defect in material and workmanship for one year from the purchase date. This warranty does not cover damages caused by accident, negligence, misuse, modification, contamination, or improper handling. The dealer is not authorized to provide any other warranty on behalf of Uni-Trend. If warranty service is needed within the warranty period, please contact your seller directly.
This warranty is the sole compensation available. Uni-Trend will not be liable for any special, indirect, incidental, or subsequent damage or loss arising from any cause or speculation. Some regions or countries may not allow limitations on implied warranties or incidental/subsequent damages, so the above limitations may not apply to you.
Manufacturer Contact Information
UNI-TREND TECHNOLOGY (CHINA) CO., LTD.
No. 6, Gong Ye Bei 1st Road,
Songshan Lake National High-Tech Industrial Development Zone,
Dongguan City, Guangdong Province, China
For further assistance or to view the full user manual in PDF format, please refer to the official documentation available at the manufacturer's website or through the provided PDF link: User Manual (PDF).
