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What was used in fire detectors before americium?

The first smoke detectors are based on optical principles - photoelectric detectors.


What are facts about the Christchurch earthquake?

The Christchurch earthquake occurred on February 22, 2011 in New Zealand. It had a magnitude of 6.3 and caused widespread damage to buildings, infrastructure, and loss of life. The city continues to rebuild and recover from the devastation caused by the earthquake.


Do wired smoke detectors mount on electrical boxes?

Hard wired smoke detectors have to have a junction box behind them. These detectors use 120 volts as a working voltage. These types of detectors should be wired with 3 conductor #14 wire. The detector uses the black and white wires for the 120 volt source. Detectors these days have an output signal wire that can be connected to other detectors so that if one trips it will sound the alarm in other detectors that are on the same circuit. This output wire can be connected to other detectors by the third red wire in the 3 conductor cable.


Are there different types of gas detectors?

Yes, there are different types of gas detectors available, such as fixed gas detectors, portable gas detectors, and personal gas detectors. Each type serves specific purposes and is designed for different applications, such as industrial safety, environmental monitoring, or personal protection.


What facts happen in the Christchurch earthquake?

The Christchurch earthquake occurred on February 22, 2011, in New Zealand. It had a magnitude of 6.3 and caused widespread damage to buildings and infrastructure in the city. The quake resulted in 185 fatalities and thousands of injuries.

Related Questions

What are facts about metal detectors?

they detect metal


What type of tools are used to determine when an earthquake will strike?

a seismometer seismograph and oceanic pressure wave detectors


Facts about the 1970 Peru earthquake?

45 secs


Facts about Haiti?

They had an earthquake just a little bit ago. :)


How do you locate where an earthquake starts?

There is a network of seismometers (earth-quake detectors) setup around the world. When an earthquake occurs it releases a set of powerful waves which travel through the Earth and are detected by the seismometers. By comparing the time taken to reach each seismometer the epicentre of the earthquake can be triangulated.


What are facts about mission dolores?

It survived great fire and earthquake in the year of 1918


What are facts in 2011 pakistan earthquake?

it went up to 7.92 struck at wednesdaymornig


Where did the Apollo 11 astronauts set up moon quake detectors at?

The Apollo 11 astronauts Neil Armstrong and Edwin Buzz Aldrin, did indeed leave behind on the moon , The moon earthquake detectors was working very well as it was found that thre were indeed moon quakes It was placed on Trasnquality Base.


What are examples of motion detectors?

Motion detectors are: infrared detectors, ultrasonic, microwave, radiowave and... dogs.


What are some amazing facts about animals?

They have been known to sense an impending earthquake before it happens.


What are some Quick facts about frank Lloyd wright?

he was an architect and he created the earthquake proof house


What are facts about the Japan Earthquake in March?

The Japan Earthquake made Japan come closer to the U.S.There was 15850 deaths, 6011 injured, and 3287 people missing afterwards.