CHENGHEM 3-in-1 Carbon Monoxide Detector User Manual

1. Introduction

The CHENGHEM KH105 is a versatile 3-in-1 device designed to enhance home safety and comfort. It functions as a Carbon Monoxide (CO) detector, a thermometer, and a hygrometer, providing real-time monitoring of CO levels, temperature, and humidity. This manual provides essential information for the proper installation, operation, and maintenance of your device.

2. Key Features

• 3-in-1 Functionality: Monitors Carbon Monoxide (CO), Temperature, and Humidity simultaneously.
• High-Definition Color Screen: Easy-to-read display for all three measurements.
• Accurate Electrochemical Sensor: Provides reliable and responsive CO detection.
• Plug-in Design: Simple and quick installation into standard power outlets.
• Voice & Light Alarm: Emits an audible alarm (>85 decibels) and visual light alerts when CO levels exceed safe thresholds.
• Test/Reset Button: Allows for easy testing of the alarm function and resetting the device.

Image 2.1: Overview of the CHENGHEM 3-in-1 Carbon Monoxide Detector highlighting its main features.

3. Package Contents

Please check the package for the following items:

• 1 × CHENGHEM 3-in-1 Carbon Monoxide Detector
• 1 × User Manual
• 1 × Protection Cotton

4. Product Overview

Familiarize yourself with the components of your CHENGHEM Carbon Monoxide Detector:

Image 4.1: Labeled diagram of the CHENGHEM Carbon Monoxide Detector components.

• Temperature Display: Shows the ambient temperature.
• CO Value (PPM): Displays the detected Carbon Monoxide concentration in parts per million.
• Humidity Display (RH%): Shows the relative humidity percentage.
• Alarm Light: Flashes red during an alarm event.
• AC Plug: For connecting the device to a standard electrical outlet.
• Test & Reset Button: Used to test the alarm function and clear alarm events.
• Alarm Voice: Speaker for audible alarm and voice prompts.
• Temperature and Humidity Sensor: Detects ambient temperature and humidity.
• Air Inlet: Allows air to reach the internal sensors.

5. Setup and Installation

The CHENGHEM Carbon Monoxide Detector is designed for easy plug-and-play installation.

5.1 Placement Guidelines

• Install the detector in rooms with fuel-burning appliances (e.g., furnaces, water heaters, fireplaces) and in sleeping areas.
• For optimal detection, place the unit at least 5 feet (1.5 meters) from any fuel-burning appliance to avoid false alarms during startup.
• Avoid placing the detector in direct sunlight, near heating/cooling vents, or in areas with high humidity (e.g., bathrooms).
• Ensure the detector is not obstructed by furniture, curtains, or other objects.

5.2 Installation Steps

1. Select a suitable standard electrical outlet in your desired location, following the placement guidelines above.
2. Plug the CHENGHEM Carbon Monoxide Detector directly into the outlet.
3. Upon plugging in, the device will initiate a 60-second preheating countdown. The display will show temperature, humidity, and a countdown. The alarm lights may flash during this period.
4. Once the countdown is complete, the device will enter normal monitoring mode, displaying current CO levels (0 PPM if clear), temperature, and humidity.

Image 5.1: The CHENGHEM Carbon Monoxide Detector installed in a living room outlet.

6. Operation

6.1 Display Readings

The high-definition color screen continuously displays three key environmental parameters:

• Temperature: Shown in Fahrenheit (°F).
• Carbon Monoxide (CO) Concentration: Displayed in Parts Per Million (PPM). A reading of 0 PPM indicates no detectable CO.
• Relative Humidity (RH%): Indicates the percentage of moisture in the air.

Image 6.1: Close-up view of the detector's LCD display showing temperature, CO level, and humidity readings.

6.2 Alarm Thresholds and Behavior

The detector is programmed to alert you to dangerous CO levels with both audible and visual alarms.

• Safe: 0-50 PPM
• Warning: 51-200 PPM
• Danger: 201-999 PPM

When CO concentration exceeds the standard threshold (typically >150 PPM to trigger a full alarm), the device will:

• Emit a loud voice alarm stating, "ATTENTION PLEASE. CARBON MONOXIDE IS DETECTED. PLEASE OPEN WINDOW AND DOOR."
• Flash the red alarm lights.
• Display the increasing CO PPM value on the screen.

Image 6.2: Visual representation of CO alarm thresholds and the device in alarm state.

6.3 Testing the Alarm

It is recommended to test the alarm function regularly (e.g., monthly) to ensure proper operation.

1. Press and hold the Test & Reset Button on the side of the device.
2. The alarm will sound, and the lights will flash, indicating that the alarm function is working correctly.
3. Release the button to stop the test.

WARNING: Never test the carbon monoxide detector using engine exhaust gas or other sources of concentrated CO, as this can permanently damage the sensor and render the device ineffective.

7. Maintenance

Proper maintenance ensures the longevity and accuracy of your detector.

• Cleaning: Gently wipe the exterior of the detector with a soft, damp cloth. Do not use cleaning sprays, polishes, or solvents. Avoid getting water into the air inlets.
• Dust Removal: Periodically vacuum the air inlets to prevent dust buildup, which can affect sensor performance.
• Regular Testing: Test the alarm monthly as described in Section 6.3.
• Sensor Lifespan: Carbon monoxide sensors have a limited lifespan. While this model is designed for durability, if the device consistently shows unusual readings or fails self-tests after several years, consider replacement.

8. Troubleshooting

If you encounter issues with your CHENGHEM Carbon Monoxide Detector, refer to the following common problems and solutions:

9. Specifications

10. Important Safety Information

Carbon Monoxide (CO) is a colorless, odorless, and tasteless gas that can be fatal. This detector is designed to alert you to the presence of CO, but it is not a substitute for proper maintenance of fuel-burning appliances or adequate ventilation.

10.1 What to do if the Alarm Sounds

1. Immediately move to fresh air outdoors or open all doors and windows to ventilate the area.
2. Do a head count to check that all persons are accounted for.
3. Do not re-enter the premises until the CO has dissipated and the alarm has stopped.
4. Call your emergency services, fire department, or a qualified technician to investigate the source of the CO.
5. Do not use fuel-burning appliances until they have been inspected and repaired by a qualified technician.

10.2 General Safety Precautions

• This device is for indoor use only.
• Do not paint the detector. Paint can clog the openings and interfere with the sensor's ability to detect CO.
• Do not block the air inlets.
• Keep out of reach of children.
• Ensure proper ventilation in areas with fuel-burning appliances.

11. Warranty and Support

CHENGHEM offers unconditional returns and exchanges within 90 days of purchase. If you have any questions, concerns, or require technical assistance with your Carbon Monoxide Detector, please contact our customer service team via email. Refer to your purchase documentation for specific contact details.