1. Introduction
Thank you for choosing the MESTEK CGD902 Natural Gas Detector. This device is designed for quick and accurate detection of combustible gas leaks in various environments, including homes, RVs, and HVAC systems. Please read this manual thoroughly before operation to ensure safe and proper use.
Package Contents
- 1 × MESTEK CGD902 Gas Leak Detector
- 3 × AAA Batteries
- 1 × Storage Bag
- 1 × User Manual
- 1 × Screwdriver
Image: The MESTEK CGD902 Gas Leak Detector and its included accessories.
2. Safety Information
Always observe the following safety precautions to prevent injury or damage to the device:
- Do not attempt to repair or modify the device. Refer all servicing to qualified personnel.
- Ensure proper ventilation when testing for gas leaks.
- Avoid exposing the device to extreme temperatures, humidity, or corrosive environments.
- Keep the device away from children.
- Replace batteries promptly when the low battery indicator appears.
- This device is a detection tool and should not replace professional gas leak inspection or safety systems.
3. Product Features and Components
The MESTEK CGD902 is equipped with features designed for efficient and reliable gas leak detection.
Key Features:
- High-Precision Sensor: Detects various combustible gases with a 2-second response time.
- 18.5-inch Flexible Gooseneck: Allows access to hard-to-reach areas.
- Audible & Visual Alarms: Provides clear indications of gas presence with sound, red backlight, and concentration levels (L/M/H) on the LCD.
- Wide Detection Range: 50-10000 PPM (based on methane).
- User-Friendly Design: Simple 5-button operation, Auto Power-off (APO) function, ZERO reset, and low battery indication.
- Durable Construction: Anti-slip silicone protective cover for wear resistance.
Image: Labeled diagram of the MESTEK CGD902 Gas Detector components.
Gases Detected:
The MESTEK CGD902 can detect a wide variety of combustible gases, including but not limited to:
- Methane
- Propane
- Natural Gas
- Butane
- LPG (Liquefied Petroleum Gas)
- LNG (Liquefied Natural Gas)
- Acetone
- Alcohol
- Benzene
- Gasoline
- IPA (Isopropyl Alcohol)
- Toluene
- Ammonia
- Sewer Gas
Image: The MESTEK CGD902 detecting various combustible gases.
4. Setup
Battery Installation
- Locate the battery compartment on the back of the device.
- Use the provided screwdriver to open the battery compartment cover.
- Insert three (3) AAA batteries, ensuring correct polarity (+/-).
- Replace the battery compartment cover and secure it with the screw.
5. Operating Instructions
Power On/Off
- Press and hold the Power ON/OFF button (center button with power symbol) to turn the device on or off.
- Upon powering on, the device will undergo a 30-second preheating process. Wait for this process to complete before beginning detection.
Gas Detection
- After preheating, position the flexible gooseneck probe near the area suspected of a gas leak.
- Move the probe slowly along pipes, connections, or appliances.
- The device will react to combustible gas leaks within 2 seconds.
Image: The flexible gooseneck probe allows for detection in confined spaces.
Alarms and Display
When a gas leak is detected:
- The unit will emit an audible alarm.
- The LCD screen backlight will turn red.
- The screen will display the gas concentration level as Low (L), Medium (M), or High (H).
Image: Visual and audible alarms indicate gas presence.
Image: LCD screen showing gas concentration levels and detection ranges.
Sensitivity Adjustment
- Press the SENS-H button for high sensitivity detection (50-10000 PPM).
- Press the SENS-L button for low sensitivity detection (500-10000 PPM).
ZERO Reset Function
- In a clean air environment, press the ZERO button to reset the sensor to zero. This ensures accurate readings by calibrating the device to the ambient air.
Auto Power-Off (APO) Function
- The device has a 10-minute Auto Power-off function to conserve battery life.
- Press the APO button to cancel or activate this function.
6. Maintenance
Cleaning
- Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Ensure the sensor probe is free from dust and debris for optimal performance.
Storage
- When not in use, store the device in its provided storage bag to protect it from dust and physical damage.
- Store in a cool, dry place, away from direct sunlight and extreme temperatures.
- Remove batteries if the device will not be used for an extended period to prevent leakage.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on | Dead or incorrectly installed batteries | Check battery polarity; replace with fresh AAA batteries. |
| Inaccurate readings / False alarms | Sensor not zeroed in clean air; sensor contaminated | Perform ZERO reset in a clean air environment. Clean the sensor probe if visibly dirty. |
| No alarm when gas is present | Low battery; gas concentration too low for current sensitivity setting | Replace batteries. Switch to high sensitivity mode (SENS-H). Ensure probe is close to the leak source. |
| Gooseneck is stiff or damaged | Physical damage or excessive bending | Handle the gooseneck carefully. If damaged, contact customer support for assistance. |
8. Specifications
| Parameter | Value |
|---|---|
| Model Number | CGD902 |
| Detection Range | 50-10000 PPM (Methane equivalent) |
| Response Time | < 2 seconds |
| Preheating Time | 30 seconds |
| Alarm Method | Audible & Visual (Red Backlight, L/M/H indication) |
| Power Source | 3 × AAA Alkaline Batteries |
| Gooseneck Length | 18.5 inches |
| Operating Humidity | 0-70% RH |
| Material | ABS |
| Product Dimensions | 5.08 x 3.05 x 14.48 cm (2 x 1.2 x 5.7 inches) |
| Item Weight | 308 g (0.68 lbs) |
9. Warranty and Support
MESTEK provides a 24-month manufacturer warranty for the CGD902 Gas Leak Detector. We also offer lifetime customer support to ensure your satisfaction. For any questions, technical assistance, or warranty claims, please refer to the contact information provided in your product packaging or visit the official MESTEK website.
