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GS509A-2NCDR Photoelectric Smoke Detector with 9V Battery

Siterwell

GS509A-2NCDR Photoelectric Smoke Detector with 9V Battery

$31.98 USD

Quantity:

Siterwell GS509A-2NCDR Photoelectric Smoke Detector with 9V Battery

$31.98 USD

Fast Detection.
Fewer Nuisance Alarms.

360° smoke entry, photoelectric sensing and adaptive compensation work together for fast, reliable home protection.

Engineered for
Reliable Detection

Certified performance, responsive detection and straightforward

controls for everyday home safety.

All-Around
Smoke Entry

Openings around the alarm

allow smoke to enter from every direction.

Fewer
Nuisance

Photoelectric sensing helps distinguish everyday cooking smoke from potential fire smoke.

Tested.
Listed.

Certified to UL 217 and CAN/ULC-S531 safety standards for residential smoke alarms.

One-Touch
Test & Silence

The large center button makes routine testing and temporary alarm silencing simple.

Simple
Battery-Powered

A replaceable battery and mounting plate provide dependable protection without household rewiring.

A Clear
85 dB Alarm

A powerful audible warning helps alert people in the room when smoke is detected.

Adaptive
Compensation

Automatically adjusts for dust and environmental changes over time.

Smoke Detection While You Sleep

Photoelectric sensing detects smoke and triggers an 85 dB alarm to alert you to potential danger.

GS509A-2NCDR internal smoke sensing feature

Directing Smoke
Where Detection Happens

Internal baffles guide incoming smoke toward the sensing chamber, helping more smoke reach the sensor.

Two Wavelengths.
More Precise Sensing.

Two wavelengths of light help distinguish cooking smoke from fire smoke, reducing nuisance alarms during everyday cooking.

More Control Over Battery Reminders

Pause low-battery chirps for up to 10 hours when you need time to replace the battery.

Everything You Need

Right in the Box

GS509A-2NCDR

User Manual

Battery

9V Battery

Plate

Universal Mounting

Screws & Plugs

Drywall, and more

About GS509A-2NCDR

10-Year Product Life: Long-lasting smoke alarm with continuous battery replacement.
Enhanced Safety: Photoelectric technology detects slow smoldering fires quickly.
Convenient Test Button: Easy weekly testing without disturbance.
Loud and Clear Alerts: Rated at ≥85 dB(A) at 10 feet (3.05 m), per the product manual.
User-Friendly Installation: Easily mountable on walls or ceilings; install in accordance with NFPA 72.

Model Number

GS509A-2NCDR

Sensor Type

Photoelectric

Product Life

10 Years

Supply Voltage

DC 9V

Frequently asked questions

What battery does the GS509A-2NCDR use, and how often should I replace it?

The GS509A-2NCDR uses a replaceable 9V carbon-zinc battery; the manual lists Eveready 1222, GP1604S and Duracell MN1604. A fresh battery provides about one year of normal operation. When the battery runs low, the alarm chirps periodically; replace the battery within 7 days.

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Does the 10-year product life mean the battery lasts 10 years?

No. The 10-year figure is the product service life from the date of manufacture, not battery life. The 9V battery should be replaced about once a year, while the complete alarm should be replaced after 10 years.

How do I mount the GS509A-2NCDR?

Mount it with the supplied plate: drill two 5 mm holes 75 mm apart, insert the wall plugs, fix the mounting plate with the screws, then twist the alarm onto the plate. The manual specifies screw mounting; it does not use a magnet.

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Where should I install the GS509A-2NCDR?

Ceiling mounting is preferred. Keep the alarm at least 4 inches from the side wall; on a wall, place the top edge 4–12 inches below the ceiling. Keep it 6 feet from cooking and heating appliances, and use only within 4.4–37.8°C and below 95% relative humidity. Do not use it in an RV or boat.

Will cooking smoke set off the GS509A-2NCDR?

It can. The photoelectric sensor responds to smoke particles, but frying or broiling smoke can still trigger it if the unit is too close to the kitchen. Keep it at least 6 feet from cooking appliances; for a nuisance alarm, press TEST/SILENCE and ventilate. Do not remove the battery.

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How do I test the GS509A-2NCDR?

Press and hold TEST/SILENCE for longer than 2 seconds, once a week. The alarm should sound three long beeps and the red LED should flash with the alarm pattern. If the test does not sound, check the battery and replace the unit if the problem continues.

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Why is my GS509A-2NCDR chirping?

A periodic chirp usually means the 9V battery is low; replace it within 7 days. If a fresh battery does not stop the chirp, the unit may have a fault; replace the alarm. Do not remove the battery and leave the unit without protection.

How do I silence a false alarm?

If you are sure the alarm is false, press TEST/SILENCE once to silence it for about 8 minutes, then open a window or fan the air. Dense smoke overrides the silence. Never remove the battery to stop an alarm.

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Does the GS509A-2NCDR interconnect with other alarms?

No. The GS509A-2NCDR is a standalone alarm. It does not support hardwired interconnection or wireless linking, so each unit operates independently. If you need whole-home interconnection, choose a hardwired or wireless interconnected model from the 886 series.

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What should I do if the GS509A-2NCDR alarms?

Treat every alarm as a real fire. Get everyone outside, call 911, and stay out until firefighters say it is safe. Do not remove the battery or re-enter to look for smoke. If you know the alarm was caused by cooking, ventilate only after everyone is safe.

What standards is the GS509A-2NCDR listed to?

The manual lists UL 217 and CAN/ULC S531. These are the standards cited for this model; confirm the current listing and edition on the product label and in the manual. It is not a substitute for a complete fire alarm system.

What does the warranty cover?

The manual states a 36-month limited warranty from the date of purchase. The battery is excluded, and the warranty covers material or production defects rather than normal wear. Keep your receipt, because warranty claims require proof of purchase.

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