Thank you Joe! Very informative! I couldn't imagine how smoke detectors work. It's pretty amazing that the somehow long time ago school learned light refraction and the constant rate of radioactive decay can be put at work! Fascinating!
You had that "early detection stage" claim completely backwards. Ionization technology is NOT better at detecting the earlier smoldering stage of a fire at all. In fact, it's been proven that ionization technology has a 55.8% FAILURE RATE in that category. Other than that, great video.
Hi, I'm finding your videos very informative and have a question. How does moisture affect ionization ones? I see lots of false alarms with kitchens and these types. I look forward to more videos. Lisa
Yeah Optic sensors is the favoured thing. Here is an example of direction of current that is interesting. americium is IONIZED or ionizing meaning its most likely a + positive charge, but diagram shows + to the ionic substance. In reality I think the Ionized Americium is stripped of electrons or "dry" whereas the + terminal is wet. and it makes sense if you apply the "electron direction" of the circuit instead of the "Ampere direction" in the circuit .
So how exactly does the ionization type know that the open chamber’s current being lower than the reference chamber’s current means that it’s time to activate.
Photoelectric cells don't produce voltage or current; light just causes them to lose their resistance to an existing current, the current then is able to the pass.... to the ALARM. And the light doesn't refract off the smoke particles to the the photoelectrc cell, they REFLECT off the smoke particles. A light alone between the charged plates will not create a voltage; besides you already have voltage potential between the plates thanks to the battery. The air between the plates is non-conductive until bombarded by the Alpha particles emitted by the Am241. Ionization of the air occurs, releasing negatively charged electrons and positively charged ions. The electrons rise to the positive plate, while the positively charged ions fall back down to the negative plate. There is now some electrical conductivity between the plates, and that condition is set to normal/no alarm by the circuitry. Should by-products of combustion enter the chamber, the conductivity is interrupted to a degree. The monitoring circuit detects this, and ..... ALARM. Best to have both types of detectors installed as there is a difference in sensitivity and the types of fire by-products which enter the air can vary depending on fire intensity, fuel type and other factors.
Would it be possible to find an e-cigarette detector anywhere, or can one be made? I'd really like a wearable smoke detector that detects drugs, but I doubt one exists. I'm at the point where I want to invent one, but don't know how. >.
I think he is just, about to show the 2 basic types. There are also aspirating, and beam detectors, and some other spec as well. But come on, Mr Clochan has only 10 mins / vid :)
Thank you Joe! Very informative! I couldn't imagine how smoke detectors work.
It's pretty amazing that the somehow long time ago school learned light refraction and the constant rate of radioactive decay can be put at work! Fascinating!
love these videos. i learn something new every time
thanks for the video it will help me pass my exam!
You had that "early detection stage" claim completely backwards. Ionization technology is NOT better at detecting the earlier smoldering stage of a fire at all. In fact, it's been proven that ionization technology has a 55.8% FAILURE RATE in that category. Other than that, great video.
question: is possible make a test with a magnet at ionic smoke detector ?
User
do we need a resistor at the end of ionization smoke detector circuit as FACP will always sense current in normalsituation?
Hi, I'm finding your videos very informative and have a question. How does moisture affect ionization ones? I see lots of false alarms with kitchens and these types. I look forward to more videos. Lisa
How are you
Are you teaching the right stuff? Isn’t photoelectric better at detecting shouldering fires and ionization better at open flame fires?
Yeah Optic sensors is the favoured thing. Here is an example of direction of current that is interesting. americium is IONIZED or ionizing meaning its most likely a + positive charge, but diagram shows + to the ionic substance. In reality I think the Ionized Americium is stripped of electrons or "dry" whereas the + terminal is wet. and it makes sense if you apply the "electron direction" of the circuit instead of the "Ampere direction" in the circuit .
Great explanation-thanks
So how exactly does the ionization type know that the open chamber’s current being lower than the reference chamber’s current means that it’s time to activate.
Photoelectric cells don't produce voltage or current; light just causes them to lose their resistance to an existing current, the current then is able to the pass.... to the ALARM. And the light doesn't refract off the smoke particles to the the photoelectrc cell, they REFLECT off the smoke particles. A light alone between the charged plates will not create a voltage; besides you already have voltage potential between the plates thanks to the battery. The air between the plates is non-conductive until bombarded by the Alpha particles emitted by the Am241. Ionization of the air occurs, releasing negatively charged electrons and positively charged ions. The electrons rise to the positive plate, while the positively charged ions fall back down to the negative plate. There is now some electrical conductivity between the plates, and that condition is set to normal/no alarm by the circuitry. Should by-products of combustion enter the chamber, the conductivity is interrupted to a degree. The monitoring circuit detects this, and ..... ALARM. Best to have both types of detectors installed as there is a difference in sensitivity and the types of fire by-products which enter the air can vary depending on fire intensity, fuel type and other factors.
Would it be possible to find an e-cigarette detector anywhere, or can one be made? I'd really like a wearable smoke detector that detects drugs, but I doubt one exists. I'm at the point where I want to invent one, but don't know how. >.
I think he is just, about to show the 2 basic types. There are also aspirating, and beam detectors, and some other spec as well. But come on, Mr Clochan has only 10 mins / vid :)