Everything below is taken from the ChesGuard CG-GD1 product manual and from the Intertek Certificate of Compliance. Nothing on this page is estimated. If you are specifying the alarm for a building, a portfolio or a compliance filing, these are the figures to quote.
Specifications
| Specification | CG-GD1 |
|---|---|
| Model | CG-GD1 |
| Detected gas | Methane (natural gas) only |
| Sensor sensitivity | 10% LEL |
| Power | DC3V built-in lithium battery, CR17505-3P |
| Battery replacement | None. The battery is built in and the whole unit is replaced at end of service life |
| Battery design life | Approximately 10 years from the date of activation. The alarm reaches the end of its service life approximately 10 years after the installation date. |
| Alarm output | 85 dB at 10 feet |
| Operating temperature | 32 F to 120.2 F (0 C to 49 C) |
| Operating humidity | 5% to 95% RH, non condensing |
| Mounting | Wall, using the supplied mounting hardware, or pipe, using cable ties that are not supplied |
| Tools required | Drill, drill bit, screwdriver |
| Installation | No electrician and no permit required for a battery powered alarm under 1 RCNY 908-02(g) |
| Listing | ETL Listed by Intertek, conforms to UL Standard 1484:6ED 2025-02-28 |
| Intertek control number | 5017086 |
| Warranty | 10-year limited warranty against defects in material and workmanship from the date of original retail purchase. See the warranty page. |
| Use | Indoor use only |
What 10% LEL Means
LEL stands for lower explosive limit, the lowest concentration of gas in air at which the mixture can ignite. For methane that point is around 5 percent of the air by volume. The CG-GD1 sounds at 10 percent of that limit, which is roughly half a percent methane in air. In other words the alarm sounds long before the atmosphere in the room becomes capable of igniting, which is the whole point of the threshold. It is set to give you time to leave, not to tell you that you are already in danger.
LED And Sound Signals
| Signal | What It Means |
|---|---|
| Green LED | Flashes when the TEST button is pressed, to confirm the alarm has power. |
| Red LED flashing every 2 seconds with a long beep sounding for 1 second and repeating on a 0.9 second cycle | Natural gas detected at 10% LEL. Evacuate and follow the emergency steps below. |
| Yellow LED flashing once every 60 seconds with 1 beep | Low battery. |
| Yellow LED flashing twice every 60 seconds with 2 beeps | Fault. |
| Yellow LED flashing three times every 60 seconds with 3 beeps | End of life, reached at approximately 10 years. Replace the unit. |
| All LEDs light, green flashes 3 times, red and yellow turn solid | Correct response to the TEST button. The alarm is working. |
The alarm resets itself. Once the gas has dispersed the sounder stops and the red LED stops flashing without any action from you. There is no reset button.
Troubleshooting
| Symptom | Likely Cause | What To Do |
|---|---|---|
| The alarm sounds a long beep on a 1 second on, 0.9 second off cycle and the red LED flashes every 2 seconds | Natural gas has been detected at 10% LEL | Do not operate any switch or flame. Leave the building, take everyone with you, and call your gas utility or the emergency services from outside. |
| One beep and one yellow flash every 60 seconds | Low battery | The battery is built in and cannot be replaced. Contact support@chesguard.com about a replacement unit. |
| Two beeps and two yellow flashes every 60 seconds | Fault condition | Check that the alarm is not blocked, dusty or greasy, and that it is inside its operating temperature and humidity range. If the signal continues, contact support@chesguard.com. |
| Three beeps and three yellow flashes every 60 seconds | End of service life | Replace the alarm. The service life is approximately 10 years after the installation date. |
| Nothing happens when the TEST button is pressed | The unit is not functioning | Do not rely on the alarm. Contact support@chesguard.com. |
| The alarm sounds and there is no smell of gas | The alarm may be too close to a cooktop, or reacting to aerosol, solvent or cleaning product vapor | Ventilate the room. If it happens repeatedly, check the placement against the installation rules and move the unit if it sits inside the 5 foot cooktop exclusion. |
| The alarm keeps nuisance alarming after being moved | Placement is still outside the recommended positions | Review the where not to install list. Turbulent air, damp and grease are the usual causes. |
Never remove or disable the battery to silence an alarm. The battery is built into the unit, removing it destroys the alarm, and the manual explicitly forbids it.
What It Detects And What It Does Not
The CG-GD1 is a single purpose device and it is important to be clear about the boundary. It detects methane, which is natural gas. It does not detect anything else, and it is not a replacement for the other alarms in a home.
- Detects: methane, natural gas
- Does not detect: carbon monoxide, smoke, fire, heat, propane, LPG, butane, or any other gas
A carbon monoxide alarm will not detect a natural gas leak and a natural gas alarm will not detect carbon monoxide. They measure different things. A home with gas appliances needs smoke, carbon monoxide and natural gas detection, and each one is a separate device.
Limitations
- Detects natural gas (methane) only.
- Indoor use only.
- Not a substitute for the correct installation, servicing and maintenance of gas appliances. The alarm warns you about a leak. It does not prevent one.
- Not intended to alert hearing impaired residents. Households that need a visual or tactile alert should specify an appropriate supplementary device.
- Do not test with a lighter. Lighters burn propane and the alarm does not respond to propane.
- The alarm cannot detect gas that does not reach the sensor, so placement and airflow matter.
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