| Model | ST8900 | AS8900 |
|
Color |
Orange |
Yellow |
|
Material |
ABS plastic |
ABS Plastic |
|
Power Supply |
3.7V li-battey(Bulit-in) |
3.7V li-battery(Built-in) |
|
Operation Temperature |
-10°C-50°C |
-10°C-50°C |
|
Operation Humidity |
15%-95%RH |
15%-95%RH |
|
low/High alarm/alarm setting |
Yes |
Yes |
|
Gas Type |
O2/CO2/H2S/Combustible Gas |
O2/CO2/H2S/Combustible Gas |
|
Battery working time |
6 hours(no alarm) |
6 hours(no alarm) |
|
Warm up time |
＜20 seconds |
＜20 seconds |
|
Resolution |
CO: 1ppm, H2S: 1ppm, O2: 0.1%VOL, LEL: 1%LEL |
CO: 1ppm, H2S: 1ppm, O2: 0.1%VOL, LEL: 1%LEL |
|
Maximum open circult voltage |
≤4.2V |
≤4.2V |
|
Package size |
26*21*7cm |
26*21*7cm |
|
Pcakage Contents |
1*Multi-Gas meter |
1*Multi-Gas meter |
| 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 |
|||
|
>23.5% |
Rich oxygen |
|||
|
20.9% |
Normal |
|||
|
19.5% |
Mini mum |
|||
|
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 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 |
||
