1. Introduction
The CHNADKS ADKS-4 Gas Detector is a portable, multi-gas monitoring device designed for the detection of four specific gases: Carbon Monoxide (CO), Oxygen (O2), Hydrogen Sulfide (H2S), and combustible gases (LEL). This device is engineered to provide reliable and accurate readings, ensuring safety in environments where these gases may be present. It incorporates advanced sensor technology, multiple alarm mechanisms, and a robust design suitable for various applications.

Image of the CHNADKS ADKS-4 Gas Detector, showing the orange device with its LCD screen displaying gas levels, alongside a USB charging cable, a back clip, and a protective carrying case.
2. Safety Information
Before operating the ADKS-4 Gas Detector, please read and understand all safety instructions. Failure to follow these instructions may result in injury, damage to the device, or inaccurate readings.
- Do not attempt to open or modify the device. Servicing should only be performed by qualified personnel.
- Ensure the device is charged before use to maintain optimal performance.
- Regularly check the device for any physical damage or blockages to the sensor inlets.
- Operate the device within its specified environmental conditions (temperature, humidity).
- This device is a safety tool; it should not replace proper safety procedures or personal protective equipment.
- Always perform a bump test or calibration check before critical use to ensure sensor responsiveness.
3. Package Contents
Verify that all items are present in the package:
- 1x ADKS-4 Gas Detector
- 1x User Manual (this document)
- 1x USB Charging Cable
- 1x Packing Box / Carrying Case
4. Device Overview
The ADKS-4 Gas Detector features a robust, industrial-grade design with an intuitive interface.
4.1. Key Features
- High-Quality Sensors: Monitors H2S, O2, CO, and LEL with fast response and low error rates. Oxygen sensors have a service life of 2-5 years.
- Triple Alarms: Provides visual (LED light), audible (sound), and vibration alerts for gas exceedances.
- Industrial-Grade Durability: Crafted from high-strength ABS engineering plastic, making it waterproof, dustproof, and explosion-proof.
- Ergonomic Design: Features a back clip for convenient carrying during on-site work.
- Long Battery Life: Equipped with a 2000mAh Li-ion battery, supporting up to 18 hours of continuous use.

Diagram illustrating the ADKS-4 Gas Detector's internal sensors for EX (combustible gases), O2 (oxygen), H2S (hydrogen sulfide), and CO (carbon monoxide), highlighting their fast response and accurate measurement capabilities.
4.2. Physical Layout
The device features an LCD screen for displaying gas concentrations, control buttons for navigation, and sensor inlets. A back clip is integrated for portability.

Rear view of the ADKS-4 Gas Detector, displaying its dimensions (5.11 inches height, 2.55 inches width, 1.77 inches depth) and the integrated back clip. Icons indicate its waterproof, dustproof, and explosion-proof features.
5. Charging the Device
The ADKS-4 Gas Detector is powered by a rechargeable 2000mAh Li-ion battery.
- Connect the provided USB charging cable to the device's charging port.
- Connect the other end of the USB cable to a standard USB power adapter (not included) or a computer USB port.
- The charging indicator on the device will illuminate during charging.
- A full charge typically takes 6-8 hours.
- Once fully charged, the device can operate for approximately 16-18 hours.

Image showing the ADKS-4 Gas Detector connected to a USB charging cable, with text indicating a charging time of 6-8 hours and a usage time of 16-18 hours from its 2000mAh rechargeable lithium battery.
6. Operating Instructions
6.1. Power On/Off
- To Power On: Press and hold the power button (usually the central button) for a few seconds until the device powers on and initiates a self-test sequence.
- Self-Test: Upon startup, the device will perform a self-check, including sensor verification and alarm tests. This process may take approximately one minute. Wait for the self-test to complete before use.
- To Power Off: Press and hold the power button again until the device powers down.
6.2. Interpreting Readings
The LCD screen displays real-time concentrations for each of the four monitored gases:
- EX (LEL): Lower Explosive Limit for combustible gases, displayed as a percentage.
- O2: Oxygen concentration, displayed as %VOL (percentage by volume). A normal oxygen level is approximately 20.9%VOL.
- H2S: Hydrogen Sulfide concentration, displayed in PPM (parts per million).
- CO: Carbon Monoxide concentration, displayed in PPM (parts per million).
Refer to local safety regulations and guidelines for acceptable gas level ranges in your specific environment.
6.3. Alarm Functions
The ADKS-4 Gas Detector features three distinct alarm types to alert users when gas concentrations exceed preset thresholds:
- Visual Alarm: Flashing LED lights on the device.
- Audible Alarm: A loud beeping sound.
- Vibration Alarm: The device vibrates.
These alarms operate simultaneously to ensure warnings are not missed, even in noisy or low-visibility conditions.

Visual representation of the three alarm types of the ADKS-4 Gas Detector: visual (flashing LED), audible (sound waves), and vibration (wavy lines), indicating how the device alerts users to gas exceedances.
7. Calibration
The ADKS-4 Gas Detector comes with factory-preset calibration levels that adhere to industry standards. While the device is ready for use out of the box, it is possible to adjust these calibration levels if specific operational requirements dictate. Accessing calibration settings typically requires a password to prevent unintended changes. It is recommended to consult the detailed instructions within the device's internal menu or contact support for advanced calibration procedures.
8. Maintenance
- Cleaning: Wipe the device exterior with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners. Ensure sensor inlets are clear of dust and debris.
- Storage: Store the device in a cool, dry place, away from direct sunlight and extreme temperatures. Use the provided carrying case for protection.
- Sensor Life: The oxygen sensor has a service life of 2-5 years. Other sensors also have a finite lifespan. Regular maintenance and calibration checks help ensure their accuracy.
- Battery Care: Recharge the battery regularly, even if the device is not in frequent use, to maintain battery health. Avoid fully discharging the battery for extended periods.
9. Troubleshooting
If you encounter issues with your ADKS-4 Gas Detector, refer to the following common troubleshooting steps:
- Device not powering on: Ensure the battery is charged. Connect the device to the charger and attempt to power on after a few minutes.
- Inaccurate readings: Perform a bump test or calibration check. Ensure sensor inlets are not obstructed. Verify the device is operating within its specified environmental conditions.
- Alarms not functioning: Check device settings to ensure alarms are enabled. During startup, the device performs an alarm self-test; if this fails, contact support.
- Short battery life: Ensure the device is fully charged. Battery performance can degrade over time; if significantly reduced, consider battery replacement (by authorized service only).
For persistent issues or problems not listed here, please contact CHNADKS customer support.
10. Technical Specifications
| Feature | Specification |
|---|---|
| Brand | CHNADKS |
| Model Number | ADKS-4 |
| Monitored Gases | H2S, O2, CO, LEL |
| Power Source | Battery Powered |
| Battery Type | 1 Lithium Ion battery (included) |
| Battery Capacity | 2000mAh |
| Charging Time | 6-8 hours |
| Usage Time | 16-18 hours |
| Product Dimensions | 2.55"D x 1.77"W x 5.11"H |
| Item Weight | 1.1 Pounds |
| Alarm Type | Audible, Visual, Vibration |
| Durability Features | Waterproof, Dustproof, Explosion-proof |
| Included Components | Gas Detector, User Manual, Charging cable, Packing Box |

Collage of four images depicting various usage environments for the ADKS-4 Gas Detector: industrial manufacturing, home and daily life, mining, and public facilities, illustrating its versatility.
11. Warranty and Support
The CHNADKS ADKS-4 Gas Detector is supplied with industry standard test reports and certificates to ensure reliability and accuracy. For specific warranty details, including coverage period and terms, please refer to the documentation provided with your purchase or contact CHNADKS customer service directly.
For technical support, troubleshooting assistance, or inquiries regarding calibration and service, please visit the official CHNADKS website or contact their customer support channels.

Image displaying several framed certificates, likely representing industry standard test reports and certifications for the ADKS-4 Gas Detector, ensuring its reliability and accuracy.





