SMART SENSOR Multi-Gas Monitor AS8900
Multi Gas Monitor Gas leak detection methods became a concern after the effects of harmful gases on human health were discovered. Before modern electronic sensors, early detection methods relied on less precise detectors. Through the 19th and early 20th centuries, coal miners would bring canaries down to the tunnels with them as an early detection system against life-threatening gases such as carbon dioxide, carbon monoxide and methane. The canary, normally a very songful bird, would stop singing and eventually die if not removed from these gases, signaling the miners to exit the mine quickly.
Multi-Gas Monitor
The first gas detector in the industrial age was the flame safety lamp (or Davy lamp) was invented by Sir Humphry Davy (of England) in 1815 to detect the presence of methane (firedamp) in underground coal mines. The flame safety lamp consisted of an oil flame adjusted to a specific height in the fresh air. To prevent ignition with these lamps the flame was contained within a glass sleeve with a mesh flame arrestor. The flame height varied depending on the presence of methane (higher) or the lack of oxygen (lower). To this day, in certain parts of the world flame safety lamps are still in service.
| Brand | SMART SENSOR Multi-Gas Monitor | ||
| Color | Yellow | ||
| Material | ABS plastic | ||
| Gas Type | Oxygen / Carbon Monoxide / Hydrogen sulfide / Combustible Gas | ||
| Resolution | 0.1% / 1μmo/mol(ppm) / 1% | ||
| Measuring Principle | Electrochemical principle life for 2 years | ||
| Low / High Alarm / Alarm Setting | V | ||
| Alarm | Sound, Light Alarm. Adjustable Alarm values, Alarm sound up to 80 db. | ||
| Operating temperature | -10~50℃ (except LEL is 0 ~40℃ ) | ||
| Operating humidity | 15%-95%RH (Standard) | ||
| Power | 3.7V li-battery (Built-in) | ||
| Battery working runtime: | 8-10 hours. And 4-6 hours work with AS8930 sampling pump. (work in room temperature and no alarm conditions.) | ||
| Product Net Weight / Size | 200g / 120.2*64.5*38.3mm | ||
| Packing | Gift Box | ||
| Packing Contents | AS8900 4 in 1 muilt gases monitor User manual Carrying brouch 7V rechargable lithium battery Charging adaptor | ||
| Sensor specification: | |||
| Gas | Range | Resolution | T90 |
| Oxygen (O2) | 0~30% | 0.1% | 10sec |
| Combustile (LEL) | 0~100%LEL | 0.1% | 35sec |
| Carbon Monoxide (CO) | 0~999ppm | 1ppm | 50sec |
| Hyrogen Sulfide (H2S) | 0~500ppm | 1ppm | 30sec |
Handheld gas detector Oxygen O2 Hydrogen sulfide H2S Carbon Monoxide CO Combustible Gas 4 in 1
| The effect of oxygen-deficient and oxygen-enriched atmospheres | ||||
| The concentration of oxygen(%) | Symptoms (atmospheric pressure) | |||
| 100% | , 6 minutes(Absolutely airtight environment, such as hyperbaric oxygen chamber | |||
| 50% | can be cured after 45 minutes treatment. (Absolutely airtight environment, such as hyperbaric oxygen chamber) | |||
| >23.5% | Rich oxygen | |||
| 20.9% | Normal | |||
| 19.5% | Minimum | |||
| 15~19% | Reduce efficiency, and lead to problems of head,lung and circulation system | |||
| 10~12% | Shortness of breath, loss of judgment, purple lips | |||
| 8~10% | governance loss, syncope, unconscious, pale, nausea and vomiting | |||
| 6~8% | 8 minutes, blood pressure, weak heartbeat,mouth breathing, quickly stopped breathing | |||
| 4~6% | 40 seconds, convulsions, respiratory arrest, death | |||
| Harm of carbon monoxide | ||||
| Content of carbon monoxide in Air | Suction time and showed symptoms of poisoning | |||
| 50ppm | Maximum | |||
| 200ppm | 2~3 hours , a slight headache, dizziness, nausea | |||
| 400ppm | 2hours, forehead pain, life risk after 3hours | |||
| 800ppm | Headache, nausea within 45minutes,death within 2~3hours | |||
| 1600ppm | Headache, nausea within 20 minutes ,death within 1 hour | |||
| The concentration of Hydrogen and symptoms of poisoning | ||||
| Range | Symptoms of poisoning | |||
| Unit: ppm | Unit: mg/m3 | |||
| 0.025~0.1 | 0.035~0.14 | Olfactory sensation | ||
| 50~100 | 70~140 | Slight symptoms of poisoning within 1~2 hours | ||
| 100~150 | 140~210 | Olfactory nerve paralysis,obvious poisoning symptoms | ||
| 200~250 | 210~350 | Can afford 0.5~1 hour, but sequela | ||
| 200~350 | 350~490 | Poisoning in 6~8 minutes,death within 4~8 hours | ||
| 350~500 | 490~700 | Seriously poisoned within 0.5~1hour,death within 1~4 hours | ||
| 500~600 | 700~835 | Seriously poisoned within 1minute,death within 0.5~4 hours | ||
| 600~700 | 835~980 | Death within 2~15 minutes | ||
| 700~1000 | 980~1400 | Imediately die | ||
| Commonly used flammable gas explosion limit Table | ||||
| Name | Chemical for mula | The explosion limit in air (V%) | ||
| Upper limit LEL | Lower limit LEL | |||
| Methane | CH4 | 5 | 15 | |
| Ethane | C2H6 | 3 | 15.5 | |
| Propane | C3H8 | 2.1 | 9.5 | |
| Butane | C4H10 | 1.9 | 8.5 | |
| Gasoline(Liquid) | C4-C12 | 1.1 | 5.9 | |
| Kerosene(Liquid) | C10-C16 | 0.6 | 5 | |
| City gas | 4 | |||
| liquefied petroleum gas | 1 | 12 | ||
| Turpentine(Liquid) | C10-C16 | 0.8 | ||
Multi-Gas gas analyzer
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