Datasheet

Revised 08/12
10
TECHNICAL INFORMATION FOR TGS3870
0.1
1
10
0 5 10 15 20 25 30 35 40
Methane 1000ppm
Methane 3000ppm
Methane 9000ppm
Rs/Ro
Temperature (˚C)
test
1 hour after test
0.01
0.1
1
10
0 5 10 15 20 25 30 35 40
CO 100ppm
CO 300ppm
CO 900ppm
Rs/Ro
Time (days)
test
1 hour after test
Figure 13b - Corrosion durability for CO sensing
(Ro = Rs in 100ppm of CO prior to test, VH =0.2)
3-3 Corrosion test
To demonstrate the durability of TGS3870 against
corrosion, samples were subjected to test conditions
called for by UL2034, Sec. 57-Corrosion Test. Over
a three week period, a mixture of H2S 100ppb, Cl2
20ppb, and NO2 200ppb was supplied to the sensor
at a rate sufcient to achieve an air exchange of 5
times per hour. Measurements in the listed gases
were taken one hour after sensors were temporarily
removed from the test mixture and returned to
normal air.
No signicant effects can be seen on the CO sensing
characteristics of the sensor during and after this
test, while methane sensing characteristics were
unaffected by this test.
Rs/Ro Rs/Ro