558 E. Industrial Place

Palm Springs, CA 92264
}

Available 24/7

For All Emergency Calls

Call Day or Night

(760) 322-0995

How Do Photoelectric Smoke Detectors Work?

by | Jan 4, 2021 | FAQs | 0 comments

a smoke detector mounted on a ceiling

 

Ever wondered how a smoke detector works? In this article you will learn the inner workings of a common smoke detector to better understand how it can detect smoke and warn us of a potential fire. 

There are two different kinds of smoke detectors. Here we will learn about the photoelectric smoke detector. 

All smoke detectors consist of two basic parts: a sensor to sense the smoke and a very loud electronic horn to wake people up. Smoke detectors can run off of a 9-volt battery or 120-volt house current.

The Photoelectric Smoke Detector explained

An effective way to understand how a photoelectric smoke detector works is by the following example: 

At some point you have probably walked in or out of a store and an alarm went off as you crossed the threshold. If you look, you will often notice that a photo beam detector is being used. Near the door on one side of the store is a light (either a white light and a lens or a low-power laser), and on the other side is a photodetector that can “see” the light.

When you cross the beam of light you block it. The photodetector senses the lack of light and triggers an alarm bell.

You can imagine how this same type of sensor could act as a smoke detector. If it ever got smoky enough in the store to block the light beam sufficiently, the bell would go off.

But there are two problems here: 1) It’s a pretty big smoke detector, and 2) it is not very sensitive.

There would have to be a LOT of smoke before the alarm would go off — the smoke would have to be thick enough to completely block out the light. It takes quite a bit of smoke to do that.

Photoelectric smoke detectors therefore use light in a different way. Inside the smoke detector there is a light and a sensor, but they are positioned at 90-degree angles to one another.

In the normal case, the light from the light source on the left shoots straight across and misses the sensor.

When smoke enters the chamber, however, the smoke particles scatter the light and some amount of light hits the sensor. The sensor then sets off the horn in the smoke detector.

Photoelectric smoke detectors are better at sensing very smoky fires, such as a smoldering mattress. The other most common smoke detector is called an ionization smoke detector. 

Learn more about fire safety fundamentals

Find valuable life saving answers to frequently asked questions about fire protection and preparedness on our F.A.Q page.

go to link free research paper on bipolar disorder genogram assignment source url causes of the protestant reformation essay costi del cialis https://zacharyelementary.org/presentation/wireless-security-thesis/30/ here essay on drugs and its effects augmentin with milk how to buy viagra online forum essay mahatma gandhi great leader can seroquel cause muscle cramping wise children essays tell fake viagra friedman essay in positive economics follow site cellulitis cipro cialis 20 mg filmtabl preisvergleich https://drexelmagazine.org/compare/ib-economics-extended-essay-guide/18/ college application essay first sentence making a thesis statment master thesis pdf acknowledgement macbeth and supernatural - essays https://dsaj.org/buyingmg/can-you-buy-viagra-over-counter-thailand/200/ https://sanctuaryforest.org/prompts/john-burroughs-american-naturalist-and-essayist/19/ https://behavior.org/typer/dissertation-1770-kant-pdf/31/ go algo alternativo viagra sildenafil nadcinienie pucne levitra longville click here Do you have a business in San Diego or the Banning, Beaumont, Cabazon, Blythe, Cathedral City, Coachella, Desert Hot Springs, Indian Wells, Indio, La Quinta, Mecca, Oasis, Palm Desert, Palm Springs, Rancho Mirage, Thousand Palms, Yucca Valley, or Twentynine Palms areas?

 Contact Desert Fire for the best services in fire extinguishers, fire alarms, fire suppression systems, fire sprinkler tenant improvement, inspections, certifications or ground up systems. 

✔ Free estimates. Just give us a call or send us a message.

✔ We’ll beat anyone’s prices.

✔ 24/7 Emergency Service. Call us anytime!

 

Recent Posts

Best San Diego Restaurants

California is a melting pot of cultures. With so many cultures coming together comes a wide selection of fantastic restaurants to choose from that boast flavors from around the world. Whether you're planning a trip to San Diego or are moving to the area, finding...

San Diego Facts

San Diego is known for its gorgeous and pristine beaches, great year-round weather, tasty food, and welcoming locals, but there's a lot more to this thriving city than meets the eye. Although San Diego is a unique and beautiful place to visit because of its many...

Best San Diego Beaches

If looking or planning an excellent vacation and looking for exceptional fun and entertainment, then San Diego is the perfect destination. Millions of tourists visit this beautiful city of California every year for endless activities. With the opportunity to enjoy...

San Diego History

San Diego is a vibrant and bustling city in southern California. This city is situated on the Pacific Ocean on San Diego Bay, only about 20 miles north of the United States Mexico border. The city of San Diego is divided into two areas. The largest part of this city...

Fire Safety Laws in Palm Springs

Fire Safety laws and regulations are extremely important to keep up to date. You can find the most recent info on fire safety laws, permits, fire codes, and more on the City of Palm Springs fire prevention website  It's our job to keep customers in the loop on local...

QUICK LINKS