Datasheet

Revised 08/12
9
TECHNICAL INFORMATION FOR TGS3870
0.1
1
10
0 2 4 6 8 10 12 14
Methane 1000ppm
Methane 3000ppm
Methane 9000ppm
Rs/Ro
Temperature (˚C)
1 hour in 10ppm HMDS
1 hour after HMDS exposure
0.01
0.1
1
10
0 2 4 6 8 10 12 14
CO 100ppm
CO 300ppm
CO 900ppm
Rs/Ro
Time (days)
1 hour in 10ppm HMDS
1 hour after HMDS exposure
Figure 12a - Inuence of silicone gas exposure on
methane sensing
(Ro=Rs in 3000ppm methane prior to HMDS exposure, VH =0.9)
Figure 12b - Inuence of silicone gas exposure on
CO sensing
(Ro=Rs in 100ppm CO prior to HMDS exposure, VH =0.2)
3-2 Inuence of silicone gas
Figures 12a and 12b show the behavior of sensor
resistance (Rs) when the sensor is exposed to 10ppm
of hexamethyldisilioxane (HMDS) gas. (The test
concentration was selected by referencing Item 5.3.13 of
European Standard EN50194.)
Sensor resistance was measured prior to HMDS
exposure (Ro), after which energized sensors were
placed into an environment of 20˚C and 65%RH.
In this environment, sensors were exposed to
10ppm HMDS for a period of 1 hour. After this
exposure, sensors were returned to normal air and
measurements in the listed gases were taken.
As this data shows, TGS3870 possesses durability to
HMDS exposure.
Rs/RoRs/Ro