JYSONGHU HFD-CO01D
JYSONGHU Carbon Monoxide Detector
User Manual
Introduction
This user manual provides important information regarding the installation, operation, and maintenance of your JYSONGHU Carbon Monoxide Detector. This device is designed to continuously monitor carbon monoxide (CO) levels and alert you to dangerous concentrations, helping to ensure the safety of your home or warehouse environment. Our carbon monoxide detectors are UL 2034 tested, meeting authoritative industry standards for electronic products in the United States.

Image: The JYSONGHU Carbon Monoxide Detector, a compact white device with a digital display showing "000 ppm" and red/green LED indicators, held in a person's hand.
Carbon monoxide is an odorless, colorless, and tasteless gas that can be deadly. It is produced by the incomplete combustion of fuels. This detector is specifically designed for carbon monoxide detection and is not suitable for smoke or other gas detection.

Image: An infographic illustrating the health effects of various carbon monoxide concentrations (PPM) over time, from mild headache at 100 PPM to death at 6400 PPM in 10 minutes. It also shows common sources like coal briquettes, honeycomb coal, and charcoal.
Product Features
- UL 2034 Tested: Certified by the most authoritative testing institute in the United States, ensuring reliability and safety.
- Advanced Electrochemical CO Sensor: Provides fast and accurate detection of carbon monoxide levels.
- Digital LCD Display: Clearly shows CO concentration in PPM (000-999PPM) with a backlight for easy readability, especially during an alarm.
- Loud 85 Decibel Alarm: Emits a distinct alarm pattern with LED flash when dangerous CO levels are detected.
- LED Indicators: Red LED flashes during an alarm, green LED flashes every 30 seconds in standby mode to indicate normal operation.
- Test/Reset Button: Allows for easy testing of the alarm function and resetting after an alarm event.
- Low Battery Indication: Alerts you when batteries need replacement.
- Power Saving Function: Optimizes battery life.
- Battery Operated: Powered by 3 x AA 1.5V batteries (not included), offering portability and operation during power outages.
- Easy Installation: Can be mounted on a wall or ceiling with included screws and anchors, no complex wiring required.

Image: A detailed diagram of the detector, pointing out its key features like the LCD display, test button, loudspeaker, and air intake, along with its compact dimensions (3.94 inches diameter, 1.57 inches height).
Package Contents
Please check the package carefully to ensure all items are present:
- 1 x Carbon Monoxide Alarm Unit
- 1 x User Manual
- 2 x Mounting Screws
- 2 x Wall Anchors (Nuts)
Setup and Installation
Follow these steps for proper setup and installation of your carbon monoxide detector:
- Battery Installation:
Before installing the detector, you need to insert the batteries. The detector requires 3 x AA 1.5V batteries (not included). Push the back cover of the carbon monoxide alarm product to the right to open it. Carefully insert the batteries, ensuring correct polarity (+ and - poles). After inserting batteries, the product will emit a "beep" alarm sound and then enter standby state. The green light will flash once every 30 seconds, indicating normal operation.

Image: Step-by-step guide for installing the detector, showing how to open the battery compartment, insert batteries, secure the base plate with screws, and attach the detector unit.
- Mounting Location:
For optimal protection, it is recommended to place a carbon monoxide detector on every floor of your home and in every bedroom. Avoid installing near ventilation openings, windows, or areas with high humidity or extreme temperatures. The detector can be mounted on a wall or ceiling.

Image: A carbon monoxide detector installed on the ceiling of a kitchen and dining room, illustrating its 360-degree monitoring capability.
- Mounting the Detector:
Once batteries are installed, fix the battery cover (mounting bracket) to the wall or ceiling using the provided screws and anchors. Then, push the alarm unit left into the battery cover to secure it.
Operation
Your carbon monoxide detector is designed for continuous monitoring. Here's how it operates:
- Normal Operation: In standby mode, the green LED light will flash once every 30 seconds, and the LCD display will show "000 PPM" or the current CO level if any is detected below alarm thresholds.
- Alarm Conditions: The detector will trigger an alarm based on the following carbon monoxide concentrations and exposure times:
- 50 ppm: Alarm within 60 to 90 minutes.
- 100 ppm: Alarm within 10 to 40 minutes.
- 300 ppm: Alarm within 3 minutes.

Image: The detector displaying "100 PPM", overlaid on an image of a living room with bubbles indicating different CO concentrations (e.g., 50 PPM, 100 PPM, 150 PPM, 190 PPM, 250 PPM, 300 PPM) to illustrate wide range detection.
- Test/Reset Button: Press the "Test/Reset" button to verify the alarm function. The alarm will sound briefly, and the LEDs will flash. This button also silences the alarm if it's sounding due to a CO detection, allowing you to ventilate the area.
- Low Battery Indication: When the battery power is low, the detector will provide a visual or audible indication (e.g., a chirp or a specific low battery icon on the LCD) to prompt battery replacement.
Maintenance
Regular maintenance ensures the continued reliability of your carbon monoxide detector:
- Monthly Testing: Press the "Test/Reset" button monthly to ensure the alarm and indicators are functioning correctly.
- Cleaning: Gently vacuum or wipe the detector's exterior with a soft, damp cloth at least once a month to remove dust and debris. Do not use cleaning agents or solvents.
- Battery Replacement: Replace batteries immediately when the low battery indication occurs. Use 3 x AA 1.5V batteries. Always ensure correct polarity.
- Do Not Paint: Never paint the detector. Paint can clog the sensor openings and interfere with the detector's ability to detect CO.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Alarm sounds continuously or frequently. | High carbon monoxide concentration detected. | Immediately move to fresh air. Call emergency services (fire department). Do not re-enter the premises until it has been aired out and the CO source identified and corrected. Press the Test/Reset button to silence the alarm after ventilating. |
| Detector chirps periodically. | Low battery warning. | Replace all 3 AA 1.5V batteries immediately. |
| No display or unit is unresponsive. | No batteries, incorrect battery installation, or dead batteries. | Ensure batteries are installed correctly with proper polarity. Replace with new batteries. If the issue persists, the unit may be faulty. |
| Alarm does not sound during test. | Faulty unit or dead batteries. | Replace batteries. If still no sound, the unit is faulty and needs replacement. |
If troubleshooting steps do not resolve the issue, please contact customer support.
Specifications
| Parameter | Value |
|---|---|
| Model Number | HFD-CO01D |
| Power Supply | 3 x AA Size 1.5V batteries (not included) |
| Sensor Type | Electrochemical CO sensor |
| Standby Current | <120uA (with LCD) |
| Alarm Current | <40mA |
| Alarm Tone | 85 decibels |
| Operation Ambient Condition | 5~40°C, 25~85% R.H. |
| Detecting Level Range | 000-999PPM |
| Error | +/-10% |
| Dimensions (D x W x H) | 3.94" x 3.94" x 1.57" (approx. 10cm x 10cm x 3.5cm) |
| Item Weight | 0.2 Pounds (approx. 80g) |
Warranty and Support
Your JYSONGHU Carbon Monoxide Detector is designed for reliable performance. While specific warranty details are not provided in this manual, we are committed to customer satisfaction.
If you encounter any issues with your Carbon Monoxide Detector, please contact us via Amazon's question message system. We are dedicated to providing good service and experience for every customer.
Ask a question about this manual
Ask about setup, troubleshooting, compatibility, parts, safety, or missing instructions. Manuals+ will review the question and use this page’s manual context to help answer it.