4 in 1 Multi-Gas Analyzer AS8900 Handheld Gas Detector(Oxygen O2 Hydrothion H2S Carbon Monoxide CO Combustible Gas)
Model No: WP- AS8900

Smart Sensor gas detector is a device that detects the presence of gases in an area, often as part of a safety system.
This type of equipment is used to detect a gas leak and interface with a control system so a process can be automatically shut down.
A gas detector can sound an alarm to operators in the area where the leak is occurring, giving them the opportunity to leave.
This type of device is important because there are many gases that can be harmful to organic life.
Gas detectors can be used to detect combustible, flammable and toxic gases, and oxygen depletion, etc.
This type of device is widely used in industry and can be found in locations,
such as on oil rigs, to monitor manufacture processes and emerging technologies such as photovoltaic.
They may also be used in firefighting.
While many of the standard gas detector units were originally fabricated to detect one gas,
modern multifunctional or multi-gas devices are capable of detecting several gases at once.
Some detectors may be utilized as individual units to monitor small workspace areas,
or units can be combined or linked together to create a protection system.

Color: Yellow
Material: ABS plastic
Gas Type: Oxygen / Carbon Monoxide /
Hydrothion / 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.)
Dimensions: 120.2 x 64.5 x 38.3 mm
Net Weight: 200g

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

The effect of oxygen-deficient and oxygen-enriched atmospheres
The concentration of oxygen(%) Symptoms (atmospheric pressure)
100% Deadly, 6 minutes(Absolutely airtight environment, such as hyperbaric oxygen chamber
50% Deadly, can be cured after 45 minutes of 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

The 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 Immediately die

Commonly used flammable gas explosion limit Table
Name Chemical formula The explosion limit in the 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

Packing Contents:
1 x Gas Detector/monitor
1 x User Manual
1 x Carrying Brouch
1 x 3.7V Rechargeable lithium battery
1 x Charging Adaptor