1. Product Overview
The Meterk KH-522 is an independent gas and carbon monoxide composite alarm designed to detect both flammable gases (such as methane, natural gas, coal gas, gas fuel, artificial gas, liquefied petroleum gas, and liquefied natural gas) and carbon monoxide. Controlled by a microprocessor, it offers stable operation, sensitive response, and is characterized by its small size and simple installation. This device is intended for use in areas where carbon monoxide or combustible gases may leak, helping to prevent dangerous accidents and ensuring personal and property safety.
2. Key Features
- 2-in-1 Detection: Combines a catalytic combustion sensor for flammable gases and an electrochemical sensor for carbon monoxide, providing sensitive and accurate detection.
- Audible and Visual Alarms: Triggers an alarm and voice reminder when gas or CO concentrations exceed safe levels. The LED screen displays the current concentration.
- Dual Power Options: Operates by plugging into a standard 120V outlet. Includes a backup slot for a 9V alkaline battery (not included) to ensure continuous protection during power outages.
- Broad Gas Detection: Capable of detecting a wide range of combustible gases including methane, natural gas, coal gas, gas fuel, artificial gas, liquefied petroleum gas, and liquefied natural gas.
3. Specifications
| Attribute | Value |
|---|---|
| Model Number | KH-522 |
| Material | ABS |
| Power Supply Mode | DC9V alkaline battery backup when plugged in or powered off |
| Alarm Current | <120 mA |
| Operating Temperature | -20℃ ~ 50℃ |
| Moisture Determination Range | 15% ~ 90% RH |
| Alarm Decibel | >85dB |
| Execution Standard | GB15322.5-2003 |
| Gas Type Detected | CO (Carbon Monoxide) and Combustible Gases |
| With LCD Screen | Yes |
| Measurement Range | --- (Not specified for all gases, CO levels detailed in alarm conditions) |
| High-concerned chemical | None |
| Certification | None |
| Item Size (L x W x D) | 127 x 74 x 60 mm (5 x 2.91 x 2.36 in) |
| Item Weight | 123 g (4.33 oz) |
4. Package Contents
The package includes the following items:
- 1 x Gas and CO Combination Alarm (Model KH-522)
- 1 x User Manual (English)
5. Setup and Installation
5.1 Component Identification
5.2 Powering the Device
- Primary Power: Plug the detector directly into a standard 120V AC electrical outlet. Ensure the outlet is functioning correctly.
- Battery Backup (Optional but Recommended): For continuous protection during power outages, install a 9V alkaline battery (not included) into the battery compartment located on the back of the device. Open the battery door, insert the battery with correct polarity, and close the door securely.
5.3 Placement Guidelines
For optimal performance and safety, consider the following:
- Install in areas prone to gas leaks, such as kitchens, utility rooms, or near gas appliances (stoves, water heaters, furnaces).
- For carbon monoxide detection, place the alarm at least 5 feet (1.5 meters) away from fuel-burning appliances to avoid false alarms from normal operation.
- Avoid placing near windows, doors, or ventilation openings where drafts could dilute gas concentrations or interfere with detection.
- Do not install in areas with high humidity or extreme temperatures (outside the specified operating range).
6. Operating Instructions
6.1 Normal Operation
Once plugged in and/or with a backup battery installed, the device will initiate a self-test. During normal operation, the green 'Power' indicator light will be continuously on, indicating the unit is functioning correctly. The LCD display will show '053 PPM' or similar readings, representing detected gas levels.
6.2 Self-Test Function
To manually test the alarm, press the 'Self-Test' button (refer to Figure 5 for location). The alarm should sound, and the lights should flash, confirming the unit's functionality. Perform this test weekly to ensure proper operation.
7. Alarm Conditions
The detector is programmed to alarm at specific concentrations of carbon monoxide and in the presence of combustible gases.
7.1 Carbon Monoxide (CO) Alarm Thresholds
- 50 PPM: Alarm will sound within 60-90 minutes.
- 100 PPM: Alarm will sound within 10-40 minutes.
- ≥ 200 PPM: Alarm will sound within 1 minute.
7.2 Combustible Gas Alarm
When flammable gas leaks are detected, the alarm will sound and provide voice reminders. The LCD screen will display the detected concentration. The alarm threshold for combustible gas is 5% LEL (Lower Explosive Limit).
7.3 What to do if the Alarm Sounds
- Immediately move to fresh air outdoors or open all doors and windows to ventilate the area.
- Do not re-enter the premises until the alarm has stopped and the area has been thoroughly ventilated.
- If the source of the gas leak is unknown or cannot be safely resolved, contact your gas provider or emergency services immediately.
- If carbon monoxide is suspected, seek medical attention for anyone experiencing symptoms of CO poisoning (headache, dizziness, nausea).
8. Maintenance
Regular maintenance ensures the longevity and reliability of your detector.
- Cleaning: Gently wipe the exterior of the detector with a soft, damp cloth. Do not use cleaning agents, solvents, or polishes, as these can damage the sensors. Avoid spraying air fresheners or other aerosols near the detector.
- Regular Testing: Press the 'Self-Test' button weekly to confirm the alarm is functioning.
- Battery Replacement: If using battery backup, replace the 9V alkaline battery annually or when the low battery indicator appears.
- Avoid Obstruction: Ensure the ventilation openings on the detector are not blocked by dust, dirt, or other objects.
9. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Alarm sounds intermittently or for no apparent reason. | Minor gas fluctuations, dust accumulation, or sensor interference. | Clean the detector. Relocate if near strong fumes or drafts. If persistent, contact support. |
| Fault Light is on. | Internal malfunction or sensor error. | Perform a self-test. If the fault light remains, the unit may require replacement. |
| No alarm during self-test. | Unit not powered, internal fault, or speaker issue. | Ensure unit is properly plugged in and/or battery is installed. If still no alarm, the unit is defective and needs replacement. |
| Gas leak suspected but no alarm. | Gas concentration below alarm threshold, detector malfunction, or gas type not detected. | Ensure the gas is within the detector's range (e.g., natural gas must be overflowing to be detected). Perform a self-test. If concerns persist, evacuate and contact emergency services. |
| LCD display is blank or dim. | Power issue or display malfunction. | Check power connection. If using battery backup, replace the 9V battery. If problem persists, contact support. |
10. User Tips
- Regular Testing is Crucial: Make it a habit to press the 'Self-Test' button at least once a week to ensure your detector is always ready.
- Battery Backup: Even though it's plug-in, always use a fresh 9V battery for backup. Power outages can happen, and continuous protection is vital.
- Strategic Placement: Place the detector where gas leaks are most likely to occur, but also where the alarm can be easily heard throughout your living space.
- Understand Alarm Levels: Familiarize yourself with the CO alarm thresholds (50ppm, 100ppm, 200ppm) to understand the urgency of different alarm scenarios.
11. Warranty and Support
For warranty information, please refer to the terms provided by your retailer or contact the seller directly. If you encounter any issues or require technical assistance, please reach out to the customer support of the 'Tools & Meter Store' where the product was purchased. Keep your purchase receipt as proof of purchase.
