Fluorescence Dissolved Oxygen Sensor High Quality Water Quality Detection Instrument Dissolved Oxygen Analyzer Probe

Fluorescence Dissolved Oxygen Sensor High Quality Water Quality Detection Instrument Dissolved Oxygen Analyzer Probe
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SMART SENSOR Multi-Gas Monitor AS8900 Handheld gas detector Oxygen O2 Hydrothion H2S Carbon Monoxide CO Combustible Gas 4 in 1 Multi-Gas gas analyzer



 1. All products with original packaging box, so that can protect the products well on the shipping way avoid damage.
 2. The product  contain the battery because of the limitation of the airline company.
 3. Warranty: All units are with Retail box. and we offer Long warranty period of 2 years,in two years will repair for free.
 4. Shipping Way: if you need it faster, you can choose Aliexpress standard shipping,also have China post airmail ! 


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.)
 Product Net Weight / Size    200g / 120.2*64.5*38.3mm 
 Packing    Gift Box
 Packing Contents                                                                                                                                                                    1pc AS8900 4 in 1 muilt gases monitor
 1pc User manual
 1pc Carrying brouch
 1pc 3.7V rechargable lithium battery
 1pc 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                  


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 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              







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