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

9

TECHNICAL INFORMATION FOR TGS2611

3-1  Corrosion test

Figure 15 shows the effect on TGS2611 of corrosive
gases specified in Item 43.15 of the UL 1484 standard.

Sensor resistance prior to corrosive gas exposure was
measured.  Unenergized sensors were then placed
into an environment of 23˚

±

2˚C and 95%RH.  In this

environment, two separate tests were conducted: one
in 0.1% H

2

S, the other in a combination of 0.5% SO

2

and 1.0% CO

2

, with each test exposure lasting 10

days.  After this exposure, the sensor was re-
energized in normal air prior to measuring sensor
resistance after removal from corrosive gases.

As this data would suggest, sensor characteristics are
temporarily influenced by exposure to corrosive gas
concentrations specified by Sec. 43.15 of UL 1484,
although the sensor quickly recovers to its normal
value after its return to clean air.

3-2  Ignition test

TGS2611 has been successfully tested against the
ignition test requirements of the UL1484 standard.
The sensor did not initiate ignition of a propane
concentration of 5.25% by volume.

3-3  Effect of air flow

Figure 16 shows how the sensor signal (V

RL

) is

affected by air flow.  The test procedure involves
situating the sensor in an air stream of 3.1 meters per
second, with the air flow vertical/horizontal to the
flameproof stainless steel double gauze of the
sensor’s housing.

The decrease in sensor signal shown in Figure 16
resulted from the decrease in sensor element
temperature caused by the air flow.  As a result, direct
air flow on the sensor should be avoided.

Fig. 15 - Corrosion test of TGS2611-C00

1

10

100

Before

exposure

1 hr. after

10 day exp.

1 day after

exposure

1 week after

exposure

Rs air
Rs 5000ppm CH4
Rs air
Rs 5000ppm CH4

Rs (k

Ω

)

Black - 0.1% H2S
White - 0.5% SO2 + 1% CO2

Fig. 16 - Effect of air flow on TGS2611-C00