1. Introduction
The Sooguard Portable 4-in-1 Multi Gas Detector is designed for the rapid and accurate detection of four common gases: Hydrogen Sulfide (H2S), Oxygen (O2), Carbon Monoxide (CO), and Combustible Gases (EX/LEL). This device features high-precision imported sensors, a fast 0.5-second response time, and multiple alert systems to ensure safety in various environments. Its robust design makes it suitable for industrial, chemical, mining, and domestic applications.

Figure 1: Sooguard Portable 4-in-1 Multi Gas Detector front view.
Key Features:
- High-Precision Sensors: Equipped with imported sensors for accurate detection of H2S, O2, CO, and LEL.
- Rapid Response: Detects gases with a fast 0.5-second response time.
- Triple Alert System: Provides visual (LED), audible (sound), and tactile (vibration) alarms.
- Data Logging: Built-in function to review historical alarm records and monitoring data.
- Durable Design: Constructed from high-strength ABS engineering plastic, offering waterproof, dustproof, and explosion-proof properties.
- Portable: Features a back clip for easy carrying in various work environments.
- Long Battery Life: Integrated 1800mAh lithium battery supports extended continuous operation.
2. Package Contents
Upon opening the package, please verify that all items listed below are present and in good condition.

Figure 2: Contents included in the Sooguard Portable 4-in-1 Multi Gas Detector package.
- 1x Sooguard Portable 4-in-1 Multi Gas Detector
- 1x Portable Aluminum Alloy Carrying Case
- 1x USB Charging Cable
- 1x Power Adapter (Charger)
- 1x Standard Gas Hood
- 1x User Manual (this document)
3. Device Overview
Familiarize yourself with the components and controls of your gas detector.

Figure 3: Front and back view of the gas detector with labeled components.
- Alarm Light: Visual indicator for alerts.
- Display Screen: Shows gas concentrations, battery status, and other information.
- Control Buttons: For navigation and settings adjustment.
- O2 Sensor Inlet: For Oxygen detection.
- CO Sensor Inlet: For Carbon Monoxide detection.
- LEL Sensor Inlet: For Combustible Gas detection.
- H2S Sensor Inlet: For Hydrogen Sulfide detection.
- USB Charging Port: For recharging the device.
- Crocodile Clip: For attaching the device to clothing or equipment.
- ABS Materials: High-strength casing for durability.
4. Setup
4.1 Initial Charging
Before first use, fully charge the device. Connect the provided USB charging cable to the detector's charging port and the power adapter. Plug the adapter into a standard electrical outlet. The charging indicator on the device will show charging status. A full charge typically takes several hours.

Figure 4: The gas detector connected to its charger for recharging.
4.2 Powering On/Off
- To Power On: Press and hold the power button (usually the center button) until the display illuminates and the device performs a self-test.
- To Power Off: Press and hold the power button until the device powers down.
4.3 Initial Calibration (Zeroing)
For accurate readings, it is recommended to perform a fresh air calibration (zeroing) in a clean, gas-free environment before each use or regularly. Refer to the on-screen menu for calibration options. Place the standard gas hood over the sensors if required for specific calibration procedures.
5. Operating Instructions
5.1 Gas Detection
Once powered on, the device will continuously monitor the levels of H2S, O2, CO, and EX (combustible gases). The current concentration for each gas will be displayed on the LCD screen.

Figure 5: The gas monitor displaying real-time concentrations for H2S, O2, CO, and EX gases.
5.2 Alert System
The detector is equipped with a triple alert system to notify users of hazardous gas levels:

Figure 6: Illustration of the visual, audible, and tactile alert modes.
- Visual Alarm: Red LED lights on the top of the device will flash.
- Audible Alarm: A loud siren will sound.
- Tactile Alarm: The device will vibrate.
These alarms activate when gas concentrations exceed the preset low or high alarm points. Refer to the Specifications section for default alarm thresholds.
5.3 Data Logging and Review
The device stores historical alarm records and monitoring data. Access this feature through the device's menu to review past events and gas level trends. This function is crucial for safety management and incident analysis.
5.4 Carrying the Device
Utilize the integrated back clip to securely attach the detector to your clothing, belt, or equipment for hands-free operation and continuous monitoring in your work area.

Figure 7: The gas detector being worn using its back clip.
6. Maintenance
6.1 Cleaning
Wipe the exterior of the device with a soft, damp cloth. Do not use abrasive cleaners or solvents, as these can damage the casing or sensors. Ensure sensor inlets are free from dust and debris.
6.2 Storage
When not in use, store the detector in its provided aluminum alloy carrying case in a cool, dry, and dust-free environment, away from direct sunlight and extreme temperatures.
6.3 Battery Care
To prolong battery life, avoid fully discharging the battery frequently. Recharge the device when the battery level is low. If storing for extended periods, charge the battery to approximately 50% every few months.

Figure 8: The device features a long-lasting 1800mAh battery with Type-C charging.
7. Troubleshooting
This section addresses common issues you might encounter with your gas detector.
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Low or depleted battery. | Charge the device fully using the provided charging cable and adapter. |
| Inaccurate or inconsistent gas readings. |
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| Alarm triggers frequently without apparent gas presence. |
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| Battery charging issues (e.g., not charging with other USB-C cables). | Compatibility issues with non-standard charging cables/adapters. | Always use the original charging cable and adapter provided with the device to ensure proper charging. |
If the problem persists after attempting these solutions, please contact customer support.
8. Specifications
Detailed technical specifications for the Sooguard Portable 4-in-1 Multi Gas Detector.
| Feature | Detail |
|---|---|
| Brand | Sooguard |
| Model Number | Sooguard 4 in 1 Gas Detector |
| Style | Industrial-Grade Gas Detector |
| Power Source | Battery Powered (1 Lithium Ion battery included) |
| Battery Capacity | 1800mAh |
| Voltage | 3.7 Volts |
| Wattage | 1 watts |
| Color | Black |
| Product Dimensions | 1.25"D x 2.85"W x 5.5"H |
| Item Weight | 10.4 ounces |
| Alarm Type | Sound, Vibration, Alarm Light, Display Screen |
| Operating Humidity | < 95% RH |
| Upper Temperature Rating | 50 Degrees Celsius |
| Sensor Type | Electrochemical |
| Material | ABS Engineering Plastic |
Gas Detection Ranges and Alarm Points:

Figure 9: Detailed gas detection parameters including ranges and alarm thresholds.
| Gas Type | Range | Low Alarm Point | High Alarm Point | Resolution |
|---|---|---|---|---|
| EX (Combustible) | 0-100% LEL | 20% LEL | 50% LEL | 1% LEL |
| H2S (Hydrogen Sulfide) | 0-100 ppm | 10 ppm | 35 ppm | 1 ppm |
| CO (Carbon Monoxide) | 0-1000 ppm | 50 ppm | 150 ppm | 1 ppm |
| O2 (Oxygen) | 0-30% Vol | 19.5% Vol | 23.5% Vol | 0.1% Vol |
9. Warranty and Support
9.1 Warranty Information
Sooguard offers an unconditional return and exchange service within 90 days of purchase. Please retain your proof of purchase for warranty claims.
9.2 Customer Support
For any assistance, questions, or technical support regarding your Sooguard Portable 4-in-1 Multi Gas Detector, please contact our 24/7 expert customer support team. Refer to the product packaging or the official Sooguard website for contact details.





