836 Royalty-Free Audio Tracks for "Car Passing"

00:00
00:11
Ambience of traffic jam (with motors, voices, …) recorded on french highway (a7). Sound recorded with a zoom h4n pro and a rycote mini wind screen. Ambiance sonore d’un embouteillage (avec moteurs, voix, …) enregistrée sur l’autoroute a7. Son enregistré avec un zoom h4n pro et une bonnette rycote mini wind screen. My sounds are licensed under the creative commons 0 license but it would be a pleasure for me to hear your work so doesn’t hesitate to comment or to send me a message with your work :).
Author: Samuelgremaud
00:00
04:06
Windy suburban night. Recorded from a upstairs bedroom window with a h4n. Wind chime. Cars passing by in the distance. Metallic bang from garden ornament. A tiny bit of wind artifact which the rycote wind jammer didn't catch. Crickets singing happily. Very big gush of wind can be heard near the end of the sound file.
Author: Philllchabbb
00:00
10:32
A street in small tourist city of łukęcin in nord west poland. Many people and passing by, and sometimes also cars and bicycles. Large group of children playing some sport games in the nearby garden. (they are cheering loud about 9:40). Some crickets (it's summer evening). Ambisonic recording with zoom h3vr. (ambix format) street and garden all in front.
Author: Maciekkubera
00:00
80:44
This recording was made in the condominium garden of my building in italy in the province of rieti, where you can hear various noises, such as: cars passing by, my dog barking and running, a passage of a hospital helicopter, while i play with my little dog etc. The recording was done with the shure mv88 digital stereo microphone connected to my iphone 12 pro.
Author: Andreauomogatto
00:00
07:28
Ambiance sound of an urban street on a summer night (it was taken at 22:30hrs). You will hear heavy traffic (motorcycles and cars), planes passing by (on minute 2:30 and 6:30), dogs barking and some indistinguishable talks. This sound was recorded with a zoom h5 in mexico city, over eje 5 sur street. If you use it, tell me where!.
Author: Orlandorizo
00:00
00:38
An empty car of the metro of porto, portugal arrives at an aboveground empty station on a january morning in 2022. Recorded with a zoom h1n. This was a no-service subway stop so the doors did not open and there is no passenger noise. The audio travels from one side to the other as the metro passes because of the stereo mics. I've benefited a lot from cc by 0 recordings on freesound--i use them for my bandcamp projects. It would be fun to know what you did with this one.
Author: Seconds Elsewhere
00:00
04:21
Rain storm in the city - cars passing over wet streets, distant low rumbling of thunder - close up of water droplets striking pavement. As a courtesy if you download my sounds please subscribe to my youtube channel: https://www. Youtube. Com/user/mycompasstv thanks!. If you use this sound please consider donating to freesound. Org. ► support us via paypal: https://www. Paypal. Me/mycompasstv many thanks!.
Author: Mycompasstv
00:00
04:29
Dawn. Distant city rumble with some traffic. Early birds. A car passes by. Recorded with zoom h4n-pro 48 khz / 24 bit. Use freely on your personal commercial and non-commercial projects. Don't put this raw sounds/files on youtube or anywhere else. You can use them in creative way as a part of art-form, but not "re-distribute" as (royalty free) stock material. Thank you.
Author: Tferrino
00:00
03:53
This sound effect was captured by me on video on my canon digital powershot a460 camera, i stood just above the motorway at charing cross glasgow scotland and captured this sound from the jam packed motorway, both sides were busy, i even caught the sound of a police car coming along the hard shoulder. I simply took the sound from my video. Please note, anybody is free to use this sound, you don't have to credit me, but it would be fun to hear how you use my sound if possible. :) here is the link to the type of licence i use. Http://creativecommons. Org/publicdomain/zero/1. 0/.
Author: Syphon
00:00
09:37
This sound was made by me, i tied down my canon powershot a460 digital camera inside the engine bay of my 1993 rover 620si, and it's got a petrol honda engine, no turbo on this version. I had my video recording on my camera in the engine bay while i was driving. I started the engine up and took it for a drive. I simply took the sound off the video. I hope you enjoy this sound. :) please note, anybody is free to use this sound, you don't have to credit me, but it would be fun to hear how you use my sound if possible. :) here is the link to the type of licence i use. Http://creativecommons. Org/publicdomain/zero/1. 0/.
Author: Syphon
00:00
02:04
I captured this sound effect on video on my canon digital powershot a460 camera, i simply took the sound from the video. It was a horrible cold wet night, and the rain was hard, plus there was a strong wind, it was too good to miss. :) please note, anybody is free to use this sound, you don't have to credit me, but it would be fun to hear how you use my sound if possible. :) here is the link to the type of licence i use. Http://creativecommons. Org/publicdomain/zero/1. 0/.
Author: Syphon
00:00
15:02
Recorded in july of 2019 at blue cliff monastery (pine bush, ny) using a zoom h1n and 3dio fs binaural microphone. At 9:30 p. M the"great togetherness meditation hall" was empty except for two meditators (one of whom can be heard leaving about three and a half minutes into the recording). The natural creaking of the building can be heard throughout. Additional sounds include outside crickets, cars passing on a nearby road, and an occasional airplane. The track volume was maximized using goldwave.
Author: Chriss
00:00
04:23
A room tone attic in ostend, belgium. Construction and scaffold building across the street. Occasional car passing. The windows were closed but it’s only single layered glass. At 3:06 you can hear my feet moving (sorry about that). Recorded with tascam dr 701d en rode ntg 3 (shotgun type mic). The shotgun was positioned on top of the tascam in between the two internal mics. No processing whatsoever. Enjoy, use this in any way you seem fit, no credit needed.
Author: Jonatanlyssens
00:00
27:07
A very long stereo ortf recording of the main square (place de la réunion) of mulhouse (france) made with a pair of akg c451 and an edirol ua-101 sound-card. German children crying most of the time, men speaking, cars passing slowly, soft rain about the middle of the recording, siren and church bell at the end. I would be glad if you let me know when you appreciate/use this recording. Enjoy.
Author: Nicocadiou
00:00
02:31
A diesel train flushing out the condensation from a particular valve, as i am told. Sounds like electricity sparking or something. It was quite loud, my gain was set extremely low, enough that i didn't pick up any of the road traffic with cars passing a few feet behind me. Mic: audio-technica at-875r shotgun micrecorder: tascam dr-40. Creative commons license because lengthy attributions suck. Use as you will.
Author: Snoopy
00:00
16:07
Soundscape of a city street in chicago during winter. Sunday, january 31st 2016 at 6:05pm. Continual planes, trains, and cars passing. Occasional pedestrians. Cta "l" trains audible at the nearby thorndale red line stop. Mic: core sound tetramicrecorder: zoom f8. Converted to b format using vvtetravst, then processed to stereo as wide cardioids at + and - 45 degrees using ambisonics toolkit (atk). Light noise reduction applied using izotope rx 7 spectral de-noise. High pass filter applied to reduce low end rumble. Some editing done to remove wind buffeting. Please note that this is a 48k 24bit flac file - flac files can be easily read and converted by audacity [https://www. Audacityteam. Org/] and reaper [http://reaper. Fm/], among others.
Author: Thaighaudio
00:00
10:42
Over 6 hours of night ambient shot in the countryside near a house close to the main road. Rain hitting the vines, thunders, village sounds, crickets, occasional cars passing on the road, far thunders with no rain, dogs barking, roosters, all in one unedited take. This was recorded with the mobile phone (allview e2 living) with the "voice recorder" app at maximum quality settings so do expect a lower quality. You are free to use this sound as you wish.
Author: Marlo
00:00
04:06
Main street in tourist costal city of dziwnówek in west poland. It's typical for cities like that: full of cheesy market stands. The game of coin-football, which you can hear ringing constantly in the background is also characteristic for polish coastal tourist areas. Many people (talking mostly polish language), and several cars are passing by. I am standing on pavement, and have thestreet in front of me and backside of supermarket behind me. The sound was recorded with zoom h3vr (ambix format).
Author: Maciekkubera
00:00
26:11
The soundscape of a thunderstorm that passed over berlin in 2012, recorded from my backyard window with a little earplug stereo mic that a friend once made for me - a dummy head. The heavy rain was followed by thunder, then transforms into softer rain that lets you hear faint city sounds like cars, doors closing, someone using a screwdriver, voices, the bells of a nearby church, airplanes and birds. There's so much to hear, i couldn't stop recording. I only took out some little peaks caused by the movement of my ear.
Author: Anjakrieger
00:00
02:07
This is a sound of a mercedes benz 709d mini bus driving on a really hard icy road. It was a rattly old bus, everything squeaked and rumbled on it. I videoed this journey with my canon powershot a460 digital camera, i simply took the sound from the video. It's a good sound, it turned out well thanks to the winter weather, and the rough icy road. Please note, anybody is free to use this sound, you don't have to credit me, but it would be fun to hear how you use my sound if possible. :) here is the link to the type of licence i use. Http://creativecommons. Org/publicdomain/zero/1. 0/.
Author: Syphon
00:00
02:43
Ambience from 5th floor balcony, sao paulo capital city (consolacao neighborhood) with foundation pile driver machine on background at augusta street building site, downtown, traffic, urban, cars and buses passing, construction, horns, pedestrians, walla. Recorded in november 2012 with zoom h1 stereo internal mics and edited with audacity.
Author: Anapb
00:00
00:26
I recently contributed a track to a triple lp set of krautrock cover versions ("head music 2", released by fruits de mer records, december 2020). The song i chose to cover was kraftwerk's "autobahn". If you know the track, you'll know that it uses synthesised traffic sounds alongside recordings of the same. On my version, i achieved these in three ways:. 1) i downloaded some public domain traffic sound effects from elsewhere here on freesound. Org (thanks, guys!). 2) i got in my car with my zoom recorder and made my own recordings of the engine starting, stopping, etc. 3) i made my own sound effects using virtual synths and effects in ableton live 10. This particular sound falls into the third category. Let me stress that while the song "autobahn" is copyrighted, these are isolated sound effects and are not covered by copyright. I'm making them available here under a public domain licence. If you download and use any of these samples, please let me know in the comments what you did with them. It's not compulsory but it would be interesting to know what people did with these sounds.
Author: Spurioustransients
00:00
02:22
I videoed this sound of a subway train in glasgow scotland on the famous "clockwork orange" train as they are called. I used my canon powershot a460 digital camera to video this, i simply took the sound from the video. I was lucky enough to get a good run on this with just a few poeple on board, so there wasn't any other sound apart from the train, the only time you here some movement of feet is when the doors open. Please note, anybody is free to use this sound, you don't have to credit me, but it would be fun to hear how you use my sound if possible. :) here is the link to the type of licence i use. Http://creativecommons. Org/publicdomain/zero/1. 0/.
Author: Syphon
00:00
15:01
While the world is holding its breath, waiting for the covid-19 to pass. . . The soundscape is different. Here in illinois, where we have a mandatory, stay at home order, the sounds of the morning winds and birds seem lonely. . . This was recorded on sunday march 29th, 2020. Usually this time of morning would also feature, people walking and talking on the sidewalk, more car traffic and church bells. . . . Recorded with the zoom f-4 recorder. The microphone was a sennheiser mkh-8060 literally pointed nearly straight up at a budding tulip poplar tree. The dominant feature is the constant river of whooshing wind. . . . . Seemingly underscoring the plight that is upon us.
Author: Kvgarlic
00:00
04:32
Thunderstorm, late night with rain falling on a quiet urban neighborhood side street of a large u. S. City. 4:30. The rain decreases over the recording. Good bits of distant thunder. Distant sirens in the last half of the recording. Some distant traffic noise, and a couple of cars passing close. I didn't notice until afterwards that i had the recorder set in mp3 format. Given another chance i'd redo as a 48/24 wav, but it doesn't rain all that often here, and the quality on this recording is still very good, 192kbps. Zoom h4n - mp3 - 44. 1/16.
Author: Ragamuffin
00:00
05:28
Made this recording to share with the community. Please feel free to use it however you wish. No credit needed. Recorded what i was hearing outside my bedroom window. It's a combination of various sounds for about 33 minutes. I did normalize the track a little bit and added a low shelving eq filter. If you want the raw audio file to do your own clean up. . . Message me. There are mic bumps and movements that you'll need to take out or edit out. I hope it's may be useful for your project. The rustling sound coming from palm trees can be used for other types of trees blowing in the wind.
Author: Alexroman
00:00
02:24
I was experimentally, recording the garage door opener, but then this happened: next door neighbor kick-starts motorcycle, idles it, an aircraft passes by, and then the motorcyclist rides away. Recorded sound is indirect except for a brief moment when the motorcycle pulls past the open garage door in the alley outside. Set up with schoeps cmc6-uxt/ mk41+mk8 ms stereo in rycote zeppelin on tripod in small suburban single-car garage that faces an alley between lots. Ms-decoded and recorded as l+r channels on sound devices mixpre-6 @ 24/192. Some light post-processing to adjust levels as well as a little compression on the loudest moment.
Author: Chromakei
00:00
00:20
Spanish. Sonidos de mi localidad amposta, en concreto estos sonidos son de coches pasando a la vez que ladra un perro del parque, todo ello mientras suenan las campanas de la iglesia. English. Sounds of my town amposta, specifically these sounds are from passing cars while a dog barks the park, all while the bells of the church sound in the background. Catalan :. Sons de la meva localitat amposta, en concret aquests sons són de cotxes passant alhora que borda un gos del lloc, tot això mentre sonen les campanes de l'església.
Author: Joelon
00:00
11:01
Street noises recorded while walking through the most touristy area of montmartre, in paris, france. Streets visited include rue des saules, rue norvins, rue du mont cenis, rue du chevalier de la barre, rue du cardinal guibert, rue azais, rue saint eleuthere, in that order. Highlights include:. 00:00-00:30-> walking south along the relatively quiet saules ("willow") street in montmartre; footsteps and squeaking boots. 00:42-01:02-> street-cleaning truck passing on the same street. 01:02-01:30-> piano playing inside a restaurant on norvins street. 01:30-01:36-> rock music in some other shop. 01:44-01:46-> kids running past. 01:56-01:58-> barely audible music somewhere, under heavy crowd sounds. 01:56-02:59-> crowd noises, clinking silverware and plates in the restuarants i'm passing, increasingly heavy crowd. 03:00-03:21-> passing van, followed by another bus. 03:21-04:06-> ill-behaved young males ruining my take with strange ape-like cries. 04:06-04:17-> i think this was a passing taxi. 04:20-05:08-> someone playing a steel drum on the ground in mont cenis street. 04:43-------> someone closing a gate, i think. 05:16-05:18-> american tourist exclaiming at close range in chevalier de la barre street. 05:53-06:18-> street portrait artists talking and joking with each other. 06:30-07:25-> someone playing the harp on cardinal guibert street next to the basilica, partially drowned out by a passing car. 07:25-08:23-> someone singing on the steps in front of sacré-coeur. He had a powerful but distorted amplifier--the bad sound quality was like that in real life. I turned around in front of the basilica on this dead-end street and that's why the music switches sides. 08:23-08:40-> yes, that's a chainsaw. The city was trimming some large trees. 09:33-09:47-> more chainsaw noise as i walked past the workers on azais street. 10:00-11:00-> increasing crowd noise as i walk back north to the busiest part of montmartre along saint eleuthere street. Recorded with a hand-held h4n at 96 khz / 24-bits, stereo, compressed into 160 kbps / 44. 1 khz / 16 bits mp3. Recording date march 16, 2012, in the early afternoon.
Author: Mxsmanic
00:00
00:14
What if we could hear sounds from another planet ?. In this imaginary place, people can visit zoos under water. Here is the sound of a yhtem, recorded by a visitor from inside his personal submarine. The recording device was found by a member of the zoo staff, as it was floating over the water. It gave no more informations about what happened to the visitor, except that according to several monster's specialists, the yhtem « sounded hungry ». In the real world, this sound was created using the sound of a very brief scream. At the background was a noisy street, and some cars were passing by. I used two different screams and mixed them, before decreasing speed and tempo in audacity. -. Xson « cannelé ». Le son « d'arrière plan » est étouffé, plutôt doux, mais il y a des « accents » rugueux, acides, lors du grognement. L'attaque est graduelle. On distingue quelques notes, différentes hauteurs. Variation scalaire.
Author: Univ Lyon
00:00
36:37
11/29/2018 - burbank, california. Rain, flooding, and mudslides come to california when a sudden storm hit today. Most people got off the freeways quickly and tried to protect their homes from water damage. This recording was recorded with a zoomh4npro (2018) set at 120 degree field-pattern mode. The zoom was placed on a tripod facing out a 3rd floor window into a dead-end alleyway below. This recording is great atmospheric sound. The water can be heard trickling off spanish tile rooftops and dripping from overflowing terracotta pots. From the passing cars on a distant highway, to the occasional cough of a homeless gentleman walking on the street below, this recording is genuine and clean. Imagine adding that sound of a metal garbage can and a shrieking cat in the night! a sound that's great for sleeping or portraying a dark alley in gotham!. Enjoy!. Christopher c. Courter.
Author: Courter
00:00
03:44
Midnight recording from the streets of neukölln, berlin, on new years day 2009. In germany, this is the one day of the year when members of the general public are allowed to set off fireworks. Echoes of bombs and fusillades ring out across the city, while clouds of smoke tumble menacingly through the streets. Close by, a peaceful child sets off sparklers, and is astonished by the display. In the morning, the streets are littered with their remnants -- charred bits of paper, streaks of red ash. Recorded with an edirol r-09. From a contemporaneous news report:. "clashes in three german cities marred new year celebrations, with police facing their toughest challenge from a crowd of mostly young revellers in the capital berlin in the small hours of yesterday. One small breakaway group from that crowd, which numbered 1,000 at the peak, tried to fire a skyrocket inside a police station and invade it, police spokesman frank millert said. The rocket lodged in a broken window and burned itself out, but several police were injured by the flying glass. Police arrested three on arson charges. Earlier, elements from the same crowd in the prenzlauer berg district had smashed the windows of a passing tram and bombarded a police patrol car with firecrackers. The trouble abated about 3am. ".
Author: Cosmicsands
00:00
00:48
Disaster alarm. A couple of glasses breaking in the middle. Why? i don't know. Ah, some explosions. Well, ok, not a simple alarm, almost a disaster (audio)scene per se. Made from (in order of appearance):https://freesound. Org/people/danlucaz/sounds/517759/ (game fx #2, danlucaz)https://freesound. Org/people/avakas/sounds/144115/ (cup breaks, avakas)https://freesound. Org/people/geraldfiebig/sounds/524999/ (ceramic cup shatters on tile floor, geraldfiebig)https://freesound. Org/people/sieuamthanh/sounds/397787/ (sci fi » alarm 0, sieuamthanh)https://freesound. Org/people/onderwish/sounds/470504/ (the dark future » emergency siren, onderwish)https://freesound. Org/people/robinhood76/sounds/188698/ (swoosh whoosh air effects » 04397 passing swoosh exploding. Wav, robinhood76)https://freesound. Org/people/robinhood76/sounds/565947/ (war 'n' battle sounds - simulations and experiments » 10091 water bomb exploding. Wav, robinhood76)https://freesound. Org/people/eflexmusic/sounds/396270/ (destruction » exploding car (with fire) (mixed), eflexmusic)https://freesound. Org/people/jorickhoofd/sounds/179265/ (glass » exploding lightbulb 1, jorickhoofd). Thank you.
Author: Deleted User
00:00
01:08
This is the audible annunciation found at all intersections with traffic lights in paris, france. It announces the condition of the traffic lights for pedestrians who are blind or with impaired vision. The annunciation is turned on by pressing a button on the traffic light pole. When the crosswalk sign is red (do not cross), the recorded annunciation is always "rouge piéton" ("red light, pedestrian"), followed by the name of the street that the crosswalk crosses (in this case "rue d'antin," the quiet side street where i recorded this). This repeats over and over until the crosswalk changes to green, at which point there is a two-second trill tone followed by a repeating bell tone. The bell tone is one bell, followed by two bells, repeated four times, followed by a very brief pause, and then the sequence is repeated again. This continues until the crosswalk changes back to red, at which point the "rouge piéton" message resumes. The annunciation continues for at least one cycle of the traffic lights and then stops, unless the button is pressed again. The audio quality of the annunciation is very poor even in real life (it sounds like a wax cylinder recording or something), and can be difficult to understand. This recording accurately captures the poor quality of the annunciation. The volume of the annunciation is also adjusted dynamically based on ambient noise, so there is a slight change in volume on this recording as the system apparently reacts to noise from traffic or something. There is a weak background noise that sounds like some sort of machine, but it wasn't coming from the traffic light and i don't know the source. The recording starts with the crosswalk red, then at about 18. 3 seconds it changes to green, then it changes back to red at about 53 seconds. A car passes at around 48 seconds. Recorded with a zoom h4n, stereo 96 khz / 24 bits, built-in mics, from about ten inches below the tiny speaker in the crosswalk sign housing.
Author: Mxsmanic
00:00
75:42
Hi. This soundfile was recorded on 03. 06. 2017 in szczecin, nw poland (gumience district to be precise). The time of this recording is from around 3 a. M. (when the sun was allready rising) till around 7:30 a. M. What's funny about that, is that i turned my recorder on and layed it on the windowsill (display up) on altitude around 5 meters (first floor), (the recorder is facing ne direction) because the birds were allready going crazy!, and after some time i felt asleep, and the recorder was left on. There are many many kinds of birds around, cause there is a big cementery near by, with lots of trees, and some wild fruit orchard too. I had this one moment, when the birds were so active, that let's say they spinned it me around, and worked me up to a beautifull spiritual moment with their sounds, and then i felt asleep. Later through the recording you can hear me snoring, you can hear my alarm clock going on (and that haven't woken me up too;). The bass resonance of cars passing by makes this recording a bit heavy in some places, and the wind made it's mark too, but that shoudn't be a big of an issue here. As i listen to it now, so much things happened while i was asleep. . . [ 3:30 a. M. !: some people are singing and speaking, and you can clearly hear one of them saying: "kurwa, grubo", which means - "f**k, heavy". Later on, the neighbours weren't sloppy too;). Hearing such recordings doesn't give you the liminous feeling of the place where it was recorded. You only get audio here, not the vision, the light, the brightness, the movement, the actions, and the space, the physical elements, only the best can imagine (so if you don't have such an imagination, pm me and i can send you a photo of the place where all this took place). Anyway, i hope that the birds will keep rockin' their solos, and the bees will keep visiting all the flowers around forever! (who knows, i might become one of them sometime;). Thanks and have a good listening session. Szymon.
Author: Twiciasty
00:00
07:20
Recorded in my dad's bedroom with lifecam hd3000 webcam. This is a much better recording than my previous oxygen concentrator file, as i hauled my desktop into the bedroom at the other end of the apartment where the machine now is, when i was home alone. The webcam is on the bed about 3 or 4 feet from the machineat the beginning of the file you hear me flip the big switch and the machine comes on with a long on beep and thumps. I edited it to start then. At 00:1. 8 what i suspect is the water pump comes on, though i may be wrong. That's when the gurgling starts though. The machine has a small reservoir for distilled water to moisten the airflow. A cup or two lasts several daysyou'll hear various hisses and thumps in a 15. 6 second cycle as it runs. At 03:03 i flip the big switch to shut the machine off, and it bubbles and gurgles away for the rest of the file, as water i assume slowly perculates back into the reservoir, the bubbling getting quieter and quieter until it doesn't even sound like bubbling anymore, until it finally ticks to a stop. At 03:16 you hear me step as i get my foot loose from the mic cord lol. At 04:13 the furnace shuts down as a car finishes going by outside in the bass register, faint traffic noises and the furnace being the only background noises you'll hear aside from my moving around a couple times, and a faint bluejay at the end. At about 07:00 you can barely hear the machine anymore, but i could hear a faint ticking with my own ears. At 07:04 the furnace comes back on. At 07:08 you'll hear a bluejay faintly calling outside and a car going by outside after, which finishes the file at 07:20. I edited out my walking to the computer to shut the recording down. From wikipediaoxygen concentrators typically use pressure swing adsorption technology and are used very widely for oxygen provision in healthcare applications, especially where liquid or pressurised oxygen is too dangerous or inconvenient, such as in homes or in portable clinics. Oxygen concentrators are also used to provide an economical source of oxygen in industrial processes, where they are also known as oxygen gas generators or oxygen generation plants. Oxygen concentrators utilize a molecular sieve to adsorb gasses and operate on the principle of rapid pressure swing adsorption of atmospheric nitrogen onto zeolite minerals and then venting the nitrogen. This type of adsorption system is therefore functionally a nitrogen scrubber leaving the other atmospheric gasses to pass through. This leaves oxygen as the primary gas remaining. Psa technology is a reliable and economical technique for small to mid-scale oxygen generation, with cryogenic separation more suitable at higher volumes and external delivery generally more suitable for small volumes. [1]at high pressure, the porous zeolite adsorbs large quantities of nitrogen, due to its large surface area and chemical character. After the oxygen and other free components are collected the pressure drops which allows nitrogen to desorb. An oxygen concentrator has an air compressor, two cylinders filled with zeolite pellets, a pressure equalizing reservoir, and some valves and tubes. In the first half-cycle the first cylinder receives air from the compressor, which lasts about 3 seconds. During that time the pressure in the first cylinder rises from atmospheric to about 1. 5 times normal atmospheric pressure (typically 20 psi/138 kpa gauge, or 1. 36 atmospheres absolute) and the zeolite becomes saturated with nitrogen. As the first cylinder reaches near pure oxygen (there are small amounts of argon, co2, water vapour, radon and other minor atmospheric components) in the first half-cycle, a valve opens and the oxygen enriched gas flows to the pressure equalizing reservoir, which connects to the patient's oxygen hose. At the end of the first half of the cycle, there is another valve position change so that the air from the compressor is directed to the 2nd cylinder. Pressure in the first cylinder drops as the enriched oxygen moves into the reservoir, allowing the nitrogen to be desorbed back into gas. Part way through the second half of the cycle there is another valve position change to vent the gas in the first cylinder back into the ambient atmosphere, keeping the concentration of oxygen in the pressure equalizing reservoir from falling below about 90%. The pressure in the hose delivering oxygen from the equalizing reservoir is kept steady by a pressure reducing valve. Older units cycled with a period of about 20 seconds, and supplied up to 5 litres per minute of 90+% oxygen. Since about 1999, units capable of supplying up to 10 lpm have been available.
Author: Kbclx
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