FD808L Gas Detector Instruction Manual

1. Introduction

The FD808L Gas Detector is an independent, plug-in device designed to detect combustible gases such as natural gas, liquefied gas (propane), pipeline gas, and biogas. It features a voice warning system, an LCD display for gas concentration in PPM, and a self-test function for sensor faults. This manual provides essential information for the safe and effective use of your gas detector.

Front view of the FD808L Gas Detector, showing LCD display, LED indicators, and indicating detection of Propane and Natural Gas.

Figure 1: FD808L Gas Detector detecting Propane and Natural Gas.

2. Product Features

Human voice prompts for warnings and status.
High reliability catalytic combustion method for gas detection.
LCD display for real-time gas concentration in Parts Per Million (PPM).
Dual power supply options: AC 90V-240V (50-60Hz) or 9V rechargeable battery (not included).
Intelligent microprocessor control for stable performance.
Automatic low battery warning.
Alarm memory function to recall past alarm events.
Automatic sensor fault self-test function.
Capable of detecting multiple combustible gases including natural gas, liquefied gas, pipeline gas, and biogas.
Sound and light alarm with a 120 dB beep and flashing red LED.
High reliability semiconductor sensor for quick detection and reduced false alarms.

Front view of the FD808L Gas Detector, highlighting voice prompts, sensor fault self-test, detection concentration, and multi-gas detection capabilities.

Figure 2: Key features of the FD808L Gas Detector.

3. Specifications

Attribute	Value
Brand Name	FD
Model Number	FD808L
AV Voltage	9V-240V AC, 50-60Hz
Battery Voltage	9V rechargeable battery (not included)
Working Temperature	0-50°C
Environment Humidity	10%-95%
Alarm Density	2500PPM (±1500PPM)
Alarm Time	Continuous alarming after exceeding 2500PPM
Product Size	112 x 73 x 42 mm (4.0 x 2.8 x 1.6 inches)
Product Weight	161g (5.69oz)
Origin	Mainland China
Certification	CE

Illustration of the high reliability semiconductor sensor, emphasizing sensitive, rapid alarm, energy saving, and long service life.

Figure 3: High reliability semiconductor sensor.

4. Package Contents

Upon opening the package, please verify that all the following items are included:

1 x FD808L Gas Detector Unit
1 x Pack of Mounting Screws
1 x User Manual (English)

Image showing the package contents: Gas Detector unit, mounting screws, and user manual.

Figure 4: Contents included in the package.

5. Installation & Setup

Proper installation is crucial for the effective operation of your gas detector. Follow these steps carefully:

5.1 Choosing an Installation Location

For Natural Gas (Methane): Natural gas is lighter than air and tends to rise. Install the detector 30 cm (12 inches) below the ceiling and within 1.5 meters (5 feet) of the gas appliance.
For Liquefied Petroleum Gas (LPG/Propane): LPG is heavier than air and tends to sink. Install the detector 30 cm (12 inches) above the floor and within 1.5 meters (5 feet) of the gas appliance.
General Guidelines: Avoid installing the detector in areas with strong air currents (near windows, doors, or ventilation fans), in direct sunlight, or in areas with high humidity. Do not install directly above cooking appliances.

5.2 Mounting the Detector

The detector can be mounted using screws or double-sided adhesive tape.

Screw Mounting:
a. Fix the provided mounting plate to the wall using the screws. Ensure the location is suitable as per section 5.1.
b. Carefully fit the gas detector unit onto the fixed plate, sliding it down until it clicks securely into place.
Adhesive Tape Mounting (Optional):
a. For a nail-free installation, you can use strong double-sided adhesive tape on the back of the detector. Ensure the wall surface is clean and dry.
b. Press the detector firmly against the wall in the desired location. This method offers a simple and firm attachment.

Diagram illustrating the installation method: fixing a plate with screws, then fitting the alarm onto the plate, and finally plugging it into a power outlet.

Figure 5: Installation method using a fixing plate and screws.

Side view of the gas detector, showing the option for wall mounting using double-sided adhesive tape.

Figure 6: Mounting with double-sided adhesive tape.

5.3 Powering the Detector

The FD808L Gas Detector supports two power supply methods:

AC Power: Plug the detector directly into a standard AC 90V-240V (50-60Hz) power outlet.
Battery Backup: For continuous operation during power outages, install a 9V rechargeable battery (not included) into the battery compartment on the back of the unit. The detector will automatically switch to battery power if AC power is interrupted.

Diagram showing two ways to supply power: 9V battery and AC 90V-240V plug.

Figure 7: Power supply options.

6. Operation

Once installed and powered, the gas detector will begin monitoring the air for combustible gases.

6.1 Indicator Lights and Display

The detector features three LED indicator lights and an LCD display:

POWER (Green LED): Illuminates when the device is receiving power and operating normally.
FAULT (Yellow LED): Flashes to indicate an equipment failure or sensor malfunction.
ALARM (Red LED): Flashes and activates the audible alarm when a gas leak is detected.
LCD Display: Shows the current gas concentration in PPM (Parts Per Million).

Close-up of the bottom front of the gas detector, showing the POWER, FAULT, ALARM LED indicators and the PUSH TO TEST button.

Figure 8: LED indicators and Test button.

Image showing the LCD display indicating gas concentration in PPM.

Figure 9: Gas concentration displayed on the LCD.

6.2 Alarm Conditions

When the gas concentration reaches 2500PPM (±1500PPM), the detector will activate the alarm.
The alarm consists of a flashing red LED, a loud 120 dB beep, and a clear voice reminder.
The alarm will continue until the gas concentration drops below the alarm threshold.

Depiction of the sound and light alarm with voice reminder, showing a flashing red light and a 120dB alarm.

Figure 10: Sound and light alarm with voice reminder.

Visual guide to the 3-color indicator lights: Green for normal, Yellow for equipment failure, Red for gas leak/alarm.

Figure 11: 3-color indicator light status at a glance.

6.3 Test Button

Press the "PUSH TO TEST" button to manually test the alarm function. This will simulate an alarm condition and verify the sound, light, and voice prompts are working correctly.

7. Maintenance

Regular maintenance ensures the longevity and accuracy of your gas detector.

Surface Cleaning: Clean the surface of the detector monthly to prevent dust buildup from obstructing the sensor or ventilation holes. Use a soft, dry cloth. Do not use detergents, sprays (like air fresheners or hair spray), or abrasive cleaners, as these can damage the sensor.
Specialist Inspection: It is recommended to have a specialist inspect the unit every six months to ensure optimal performance and calibration.
Battery Replacement: If using a 9V rechargeable battery, replace it when the low battery warning is indicated.

8. Troubleshooting

Problem	Possible Cause	Solution
Detector not working after installation	Impact or shock during transit/installation; power issue.	Check power connection. If battery-powered, ensure battery is installed correctly and charged. Re-install the unit carefully. If problem persists, contact support.
Yellow FAULT LED flashes	Sensor malfunction or equipment failure.	Ensure the unit is properly plugged in. If the fault persists after a power cycle, the sensor may be damaged. Contact support for assistance.
Low battery warning	9V rechargeable battery is low.	Replace the 9V rechargeable battery.
False alarms	Interference from sprays, strong air currents, or improper placement.	Ensure no sprays are used near the detector. Relocate the detector away from strong drafts or direct heat sources. Clean the sensor area.

9. User Tips

Regular Testing: Press the 'PUSH TO TEST' button weekly to ensure the alarm functions correctly.
Optimal Placement: Remember that natural gas rises and propane sinks. Install your detector accordingly for the most effective detection.
Ventilation: In case of an alarm, immediately ventilate the area by opening windows and doors.
Emergency Protocol: Familiarize yourself with emergency procedures for gas leaks in your home or facility.

10. Warranty & Support

The FD808L Gas Detector comes with a 1-year warranty from the date of purchase. For warranty claims, technical support, or any questions regarding the product, please contact your retailer or the manufacturer's customer service.

11. Important Safety Notices

Combustible Gas Only: This device is a Combustible Gas Detector and cannot detect poisonous gases such as Carbon Monoxide (CO). For CO detection, a separate CO detector is required.
Not a Smoke Detector: This device is not suitable as a smoke detector.
Shock Hazard: Do not open the unit. There is a shock hazard. Do not paint the unit.
Power Failure: The unit will not operate during a power failure unless a 9V rechargeable battery is installed.
Household Use: This device is suitable for installation in a household location as defined in the national electrical code.
Safety Enhancement: This product is designed to reduce the risk of accidents but cannot guarantee prevention every time. Always pay attention to your daily life and strengthen safety and security consciousness.

Back view of the gas detector, displaying mounting holes, battery compartment, and regulatory labels including a warning about shock hazard and not opening the unit.

Figure 12: Back of the detector with safety warnings.

FD FD808L