1. Introduction
Thank you for choosing the Neoteck Portable Gas Leak Detector NTK261. This device is designed to detect various combustible gases, including methane, propane, and natural gas, providing audible and visual alarms to ensure safety in your home or workplace. Its high-precision sensor and flexible probe allow for swift and accurate detection of gas leaks.
2. Safety Information
- WARNING: This device is a detection tool and should not replace proper safety procedures. Always ensure adequate ventilation when dealing with potential gas leaks.
- Do not expose the device to extreme temperatures, high humidity, or corrosive environments.
- Always perform a 30-second preheating in a clean air environment after powering on to ensure accurate sensor readings.
- If the natural gas detector emits a continuous beeping sound, it indicates a low battery. Replace batteries promptly to maintain functionality.
3. Package Contents
Please check the package contents upon receipt:
- Neoteck Portable Gas Leak Detector NTK261
- Carrying Case
- AAA Batteries (3x)
- Small Screwdriver
- User Manual (this document)

4. Product Overview
The Neoteck NTK261 features a flexible gooseneck probe for reaching confined spaces and an LCD display for clear readings and status indicators.

Key Components:
- Flexible Sensor Neck: 12-inch gooseneck probe for accessing narrow or hard-to-reach areas.
- LCD Display: Shows gas concentration (analog bar), temperature, humidity, battery indicator, and sensitivity mode.
- Power On/Off Button: Controls device power and toggles auto-shutdown.
- Alarm Sound On/Off Button: Mutes/unmutes the audible alarm.
- Temperature Units Selection Button (°C/°F): Switches between Celsius and Fahrenheit.
- Low Sensitivity Mode (LOW): For locating the general leak range.
- High Sensitivity Mode (HIGH): For pinpointing the exact leak source.
- Battery Indicator: Displays current battery level.
- Auto Off Indicator: Shows if the 10-minute auto-shutdown is active.
5. Setup
5.1 Battery Installation
- Open the battery compartment cover on the back of the device using the provided screwdriver.
- Insert three (3) AAA batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover and secure it with the screw.
5.2 Initial Power On and Preheating
- Press and hold the Power On/Off button (
) to turn on the device. - The LCD will display "ZERO WAIT...." and a countdown. Place the device in a clean air environment (free from gas) and wait for approximately 30 seconds for the sensor to preheat and stabilize. This ensures accurate readings.
- Once preheating is complete, the device is ready for use.
6. Operating Instructions
6.1 Gas Detection
- After preheating, move the flexible gooseneck probe slowly towards the suspected area of a gas leak.
- Observe the LCD display and listen for the audible alarm.
6.2 Sensitivity Modes (LOW/HIGH)
The device offers two sensitivity modes:
- LOW Sensitivity: Use this mode to quickly identify the general area where a gas leak might be present. Press the 'LOW' button to activate.
- HIGH Sensitivity: Once a general area is identified, switch to 'HIGH' sensitivity by pressing the 'HIGH' button to pinpoint the exact source of the leak.

6.3 Audible and Visual Alarm
As the concentration of combustible gas increases, the device will provide dual alarms:
- Visual Alarm: The analog bar on the LCD display will change color from blue to yellow, then to red, indicating increasing gas concentration.
- Audible Alarm: A beeping sound will become faster as the gas concentration rises. The alarm triggers when the concentration reaches 300 PPM.

6.4 Muting the Alarm Sound
Press the Alarm Sound On/Off button (
) to silence the beeping sound. Note that the device will still beep if the gas concentration exceeds 300 PPM, even if muted.
6.5 Temperature Units Selection
Press the °C/°F button (
) to switch the temperature display between Celsius and Fahrenheit.
6.6 Automatic Shutdown
The device has a 10-minute automatic shutdown feature to conserve battery life. To toggle this feature on or off, briefly press the Power On/Off button (
) during operation.
7. Maintenance
7.1 Battery Replacement
When the battery indicator shows low power or the device emits a continuous beeping sound, replace the three AAA batteries promptly to ensure optimal performance.
7.2 Cleaning
Wipe the device with a soft, dry cloth. Do not use abrasive cleaners, solvents, or corrosive chemicals, as these can damage the device or sensor.
7.3 Sensor Care
Keep the sensor head on the flexible probe clean and free from dust, debris, or obstructions. Avoid touching the sensor directly.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not turn on. | Batteries are dead or incorrectly installed. | Check battery polarity and replace with fresh AAA batteries. |
| Continuous beeping sound. | Low battery. | Replace batteries immediately. |
| Inaccurate or inconsistent readings. | Device not preheated in clean air; sensor obstructed or dirty. | Ensure 30-second preheating in a clean environment. Clean sensor head. |
| No alarm for suspected gas leak. | Incorrect sensitivity mode; sensor not positioned correctly. | Switch to 'HIGH' sensitivity mode. Ensure the sensor head is close to the potential leak source. |
9. Specifications
| Feature | Specification |
|---|---|
| Model Number | NTK261 |
| Gas Type Detected | Combustible Gas (Methane, Natural Gas, Propane, LPG, Alcohol, Butane, Gasoline, Gas Fuel) |
| Detection Range (Methane) | 300-10000 PPM |
| Response Sensitivity (Methane) | <50ppm |
| Response Time | <=500PPM: approx. 5s; >500PPM: approx. 2s |
| Humidity Testing Range | 20-80% RH |
| Humidity Testing Accuracy | ±4% |
| Temperature Testing Range | -10-50°C |
| Temperature Testing Accuracy | ±1°C |
| Alarm | Audible (70dB muteable) and Visual (LCD bar graph) |
| Display | LCD Screen |
| Automatic Shutdown | 10 minutes (toggleable) |
| Power Source | 3x AAA Batteries |
| Flexible Probe Length | 12 inches |
| Certification | CE |


10. User Tips
- For best accuracy, always power on the device in a clean air environment and allow it to preheat for 30 seconds before beginning detection.
- When searching for a leak, start with the 'LOW' sensitivity mode to quickly identify the general area, then switch to 'HIGH' sensitivity to pinpoint the exact source.
- Regularly check the battery indicator. Replace batteries promptly when the low battery warning appears to ensure continuous and reliable protection.
- The flexible probe is designed to reach tight spaces. Utilize its flexibility to thoroughly inspect areas like pipe joints, appliance connections, and behind walls.
11. Warranty and Support
Neoteck products are designed for reliability and performance. For warranty information, technical assistance, or any questions regarding your NTK261 Gas Leak Detector, please refer to the contact details provided by your retailer or visit the official Neoteck website for support resources.

