Figaro TGS2610-C00 TGS 2610 Gas Sensor For LP Gases Alcohol, Methane, Propane, Iso-Butane (Ø x H) 9.2 mm x 7.8 mm TGS2610-C00 Scheda Tecnica
Codici prodotto
TGS2610-C00
Revised 03/06
9
TECHNICAL INFORMATION FOR TGS2610
3. Reliability
3-1 Gas exposure test #1
Figure 15 shows the test procedure of short-term high
concentration exposure to iso-butane gas. During this
test, the sensor was kept energized under standard
circuit conditions. The sensor resistance in both
1500ppm and 4500ppm of iso-butane was measured
during 4 minute periods before and after the gas
exposures (runs #1~12). All exposures in gas during
this test were followed by exposure in normal air.
concentration exposure to iso-butane gas. During this
test, the sensor was kept energized under standard
circuit conditions. The sensor resistance in both
1500ppm and 4500ppm of iso-butane was measured
during 4 minute periods before and after the gas
exposures (runs #1~12). All exposures in gas during
this test were followed by exposure in normal air.
The gas exposure conditions were 4500ppm for 10
minutes, 9000ppm for 10 minutes, 1.5% (15000ppm)
for 10 minutes, and 1.5% for 30 minutes. A second
30 minute exposure in 1.5% was done, but with V
minutes, 9000ppm for 10 minutes, 1.5% (15000ppm)
for 10 minutes, and 1.5% for 30 minutes. A second
30 minute exposure in 1.5% was done, but with V
H
set equal to 6.0V.
Two days elapsed before test run #11 was completed.
After this, sensors were energized in normal air for 3
days before run #12 for checking long-term effects.
After this, sensors were energized in normal air for 3
days before run #12 for checking long-term effects.
Heater resistance at room temperature was also
measured after gas exposure in order to check for
the influence of high concentration gas exposure.
measured after gas exposure in order to check for
the influence of high concentration gas exposure.
The test results are shown in Figs. 16 and 17. The
1.5% iso-butane exposure while V
1.5% iso-butane exposure while V
H
=5.0V appeared
to increase sensor resistance in gas temporarily (run
#8~9). Increasing heater voltage to 6.0V during 1.5%
exposure caused a decrease in heater current,
resulting in decreased sensor resistance in gas. In
this case, the heater current did not recover to its
original value (run #10~12).
#8~9). Increasing heater voltage to 6.0V during 1.5%
exposure caused a decrease in heater current,
resulting in decreased sensor resistance in gas. In
this case, the heater current did not recover to its
original value (run #10~12).
As this section illustrates, exposure to iso-butane itself
will cause a transitory effect from which the sensor
can recover. However, high intensity exposure,
coupled with higher than standard heater voltage,
will cause a permanent change in heater current due
to combustion of gas on the surface of the heater
material at elevated heater voltage. Note that this
phenomenon would not occur when elevated heater
voltage is applied in fresh air (see Figure 22). In add-
ition, sensor characteristics may also be altered due
to combustion on the surface of the sensing material.
will cause a transitory effect from which the sensor
can recover. However, high intensity exposure,
coupled with higher than standard heater voltage,
will cause a permanent change in heater current due
to combustion of gas on the surface of the heater
material at elevated heater voltage. Note that this
phenomenon would not occur when elevated heater
voltage is applied in fresh air (see Figure 22). In add-
ition, sensor characteristics may also be altered due
to combustion on the surface of the sensing material.
0.1
1
10
100
0
2
4
6
8
10
12
Run number
Rs (air), k
Ω
Rs (1500ppm iso-butane), k
Ω
: Rs(4500ppm iso-butane)/Rs(1500ppm iso-butane)
β
50
52
54
56
58
60
0
2
4
6
8
10
12
Heater current (mA)
Run number
Fig. 15 - Test procedure for gas exposure
Fig. 16 - Effect of iso-butane exposure on Rs of TGS2610-C
Fig. 17 - Effect of gas exposure on heater current of TGS2610-C
0.0
0.45
0.9
1.5
1 2
3
4 5
6 7
8 9
10 11 12
Run number
Time
4 min.
10 min.
30 min.
6 V