Datasheet

Revised 08/12
8
TECHNICAL INFORMATION FOR TGS3870
0.1
1
10
0 10 20 30 40 50 60
Methane 1000ppm
Methane 3000ppm
Methane 9000ppm
Rs/Ro
Time (days)
test
0.01
0.1
1
10
0 10 20 30 40 50 60
CO 100ppm
CO 300ppm
CO 900ppm
Rs/Ro
Time (days)
test
Figure 11a - Effects of exposure to 30ppm CO for 30 days
(Ro= Rs in 3000ppm methane prior to CO exposure, VH =0.9)
Figure 11b - Effects of exposure to 30ppm CO for 30 days
(Ro= Rs in 100ppm CO prior to CO exposure, VH =0.2)
3. Reliability
3-1 False alarming test
To demonstrate the sensor’s behavior under
continuous low level exposure to CO, samples were
tested according to the procedure detailed in UL2034,
Sec. 41.1(c)-Stability Test. Test samples were exposed
to 30ppm of CO continuously for 30 days under
standard circuit conditions. As this data shows, no
signicant change can be seen in CO and methane
sensing characteristics as a result of continuous low
level exposure to CO.
Rs/RoRs/Ro