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
6
TECHNICAL INFORMATION FOR TGS2611
0.1
1
10
100
0.1
1
10
100
Is (mA)
Vs (v)
2-3 Heater voltage dependency
Figure 8 shows the change in the sensor resistance
ratio according to variations in heater voltage (V
ratio according to variations in heater voltage (V
H
).
Note that 5.0V as a heater voltage must be maintained
because variance in applied heater voltage will cause
the sensor’s characteristics to be changed from the
typical characteristics shown in this brochure.
because variance in applied heater voltage will cause
the sensor’s characteristics to be changed from the
typical characteristics shown in this brochure.
2-4 Cautions on sensor power consumption
Figure 9 shows the typical relationship between
sensor voltage (Vs) and sensor current (Is) for
TGS2611 in various gas concentration. This
relationship is referred to as V-I characteristics.
sensor voltage (Vs) and sensor current (Is) for
TGS2611 in various gas concentration. This
relationship is referred to as V-I characteristics.
When circuit voltage is applied to the sensor in the
basic measuring circuit (see Figure 2), Joule heat is
generated by the sensor current. The amount of Joule
heat is equivalent to sensor power consumption (Ps)
and can be calculated according as follows:
basic measuring circuit (see Figure 2), Joule heat is
generated by the sensor current. The amount of Joule
heat is equivalent to sensor power consumption (Ps)
and can be calculated according as follows:
Ps =
where:
R
L
: Load resistor value (k
Ω
)
V
RL
: Sensor output voltage (v)
Vc : Circuit voltage (v)
Ps : Power consumption (mW)
Ps : Power consumption (mW)
The maximum sensor power consumption value is
Vc
Vc
2
/(4 x R
L
) when sensor output voltage is Vc/2.
According to the V-I characteristics shown in Fig. 9,
if Ps exceeds 15mW, the sensor would deviate from
Ohmic behavior, thus altering its characteristics from
those shown as typical in this brochure. Also, excess
sensor power consumption may cause permanent
damage to the sensor due to Joule heat.
if Ps exceeds 15mW, the sensor would deviate from
Ohmic behavior, thus altering its characteristics from
those shown as typical in this brochure. Also, excess
sensor power consumption may cause permanent
damage to the sensor due to Joule heat.
To protect the sensor against deviating from Ohmic
behavior, please refer to Table 2 for suggested
minimum R
behavior, please refer to Table 2 for suggested
minimum R
L
values according to the user’s circuit
voltage.
0.1
1
10
100
4.4
4.6
4.8
5.0
5.2
5.4
5.6
5.8
Rs/Rs(VH=5V, 3000ppm methane)
Heater Voltage (VH)
Air
Methane 3000ppm
Methane 9000ppm
Vc=5V
Fig. 8 - Heater voltage dependency (Vc=5.0)
Fig. 9 - V-I characteristics
c
V
L
R
m
u
m
i
n
i
M
k
(
Ω
)
1
7
1
0
.
0
5
.
2
4
0
1
.
0
5
2
4
.
0
Table 2 - Minimum suggested R
L
values
Air
Methane 3000ppm
Methane 9000ppm
Ps = 15mW
Ps = 5mW
Ps = 10mW
V
RL
x (Vc-V
RL
)
R
L