Figaro TGS2611-C00 TGS 2611 Gas Sensor For LP Gases Methane (Ø x H) 9.2 mm x 7.8 mm TGS2611-C00 Hoja De Datos
Los códigos de productos
TGS2611-C00
Revised
02/05
11
TECHNICAL INFORMATION FOR TGS2611
3-5 HMDS test
Figure 19a shows the effect on TGS2611-C00 of
silicone vapor as specified in Item 5.3.13 of the ES
(European standard) EN50194.
Figure 19a shows the effect on TGS2611-C00 of
silicone vapor as specified in Item 5.3.13 of the ES
(European standard) EN50194.
Sensor resistance prior to HMDS (Hexamethyl
disiloxane) gas exposure was measured (Ro).
Energized sensors were placed into an environment
of 20˚C, 50%RH. In this environment, the sensors
were exposed 10 ppm of HMDS for 40 minutes. After
exposure, the sensor was returned to normal air.
Sensor resistance (Rs) in both air and 5000 ppm of
methane were measured at 1 hour, 1 day, and 1 week
after being removed from HMDS.
disiloxane) gas exposure was measured (Ro).
Energized sensors were placed into an environment
of 20˚C, 50%RH. In this environment, the sensors
were exposed 10 ppm of HMDS for 40 minutes. After
exposure, the sensor was returned to normal air.
Sensor resistance (Rs) in both air and 5000 ppm of
methane were measured at 1 hour, 1 day, and 1 week
after being removed from HMDS.
As this data would suggest, sensor characteristics
remain largely unaffected by exposure to HMDS gas
concentrations specified by Item 5.3.13 of ES
EN50194.
remain largely unaffected by exposure to HMDS gas
concentrations specified by Item 5.3.13 of ES
EN50194.
However, silicone vapor (which is of low molecular
weight) can easily be thermally decomposed to
silicone dioxide (SiO
weight) can easily be thermally decomposed to
silicone dioxide (SiO
2
) by the working temperature
of the sensor. Decomposed SiO
2
would cause
deactivation of the catalyst in the sensing material
and therefore decrease the sensor’s resistance in air
and alter its sensitivity to gas (see Fig. 19b).
and therefore decrease the sensor’s resistance in air
and alter its sensitivity to gas (see Fig. 19b).
Figures 19b and 19c show durability test data for
HMDS concentrations higher than those used in Fig.
19a. The effectiveness of the filter inside the cap of
TGS2611-E00 at reducing the effects of HMDS can
be seen when comparing the extent of changes in
Rs(air) between TGS2611-E00 (Fig. 20c) and TGS2611-
C00 (Fig. 20b).
HMDS concentrations higher than those used in Fig.
19a. The effectiveness of the filter inside the cap of
TGS2611-E00 at reducing the effects of HMDS can
be seen when comparing the extent of changes in
Rs(air) between TGS2611-E00 (Fig. 20c) and TGS2611-
C00 (Fig. 20b).
0.1
1
10
Before
exposure
1 hr after
exposure
1 day
after exposure
1 week
after exposure
air
5000ppm methane
Rs/Ro
Fig. 19a - Durability to HMDS exposure for TGS2611-C00
(Ro = Rs in 5000ppm methane before exposure)
1
10
Before
exposure
After 10ppm
for 40 min.
After 30ppm
for 40 min.
After 100ppm
for 40 min.
1 day after
exp. test
1 week after
exp. test
Rs (air), k
Ω
Rs (5000ppm methane), k
Ω
Rs(k
Ω
)
Fig. 19b - Durability to HMDS exposure for TGS2611-C00
3.6 Lighter gas exposure test
Consumers often check if detectors are actually
sensing gas by exposing them to lighter gas (main
component is iso-butane). Because the filter will
block iso-butane from reaching the sensing element,
this test cannot be used with TGS2611-E00.
Consumers often check if detectors are actually
sensing gas by exposing them to lighter gas (main
component is iso-butane). Because the filter will
block iso-butane from reaching the sensing element,
this test cannot be used with TGS2611-E00.
Although testing with methane gas is preferable,
lighter gas may be used, although special care must
be used when doing so. If testing is conducted
properly, the estimated gas exposure is less than 10%
and would cause no lasting harmful effects to the
sensor. Improper testing may expose the sensor to
more than 10% iso-butane and potentially harm the
sensor.
lighter gas may be used, although special care must
be used when doing so. If testing is conducted
properly, the estimated gas exposure is less than 10%
and would cause no lasting harmful effects to the
sensor. Improper testing may expose the sensor to
more than 10% iso-butane and potentially harm the
sensor.
Fig. 19c - Durability to HMDS exposure for TGS2611-E00
1
10
Rs(air) k
Ω
Rs(5000ppm methane) k
Ω
Rs(k
Ω
)
Before
exposure
After 10ppm
for 40 min.
After 30ppm
for 40 min.
After 100ppm
for 40 min.
1 day after
exp. test
1 week after
exp. test