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PDF TGS4161 Data sheet ( Hoja de datos )

Número de pieza TGS4161
Descripción Technical Information for Carbon Dioxide Sensors
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Revised 05/04
TECHNICAL INFORMATION FOR TGS4161
Technical Information for Carbon Dioxide Sensors
The Figaro TGS4161 is a new solid
electrolyte type sensor which offers
miniaturization, low power con-
sumption, and long life. The
TGS4161 displays high selectivity to
carbon dioxide. Also, the TGS4161
displays good long term stability and
shows excellent durability against the
effects of high humidity through the
application of innovative technology
in the sensor’s electrode design.
Page
Basic Information and Specifications
Features..........................................................................2
Applications...................................................................2
Structure..............................................................................2
Operating Principle.............................................................................2
Basic Measuring Circuit....................................................2
Circuit & Operating Conditions.........................................3
Specifications..............................................................................3
Dimensions...............................................................................3
Typical Sensitivity Characteristics
Sensitivity to Various Gases................................................4
Temperature Dependency.................................................................4
Humidity Dependency........................................................................5
Heater Voltage Dependency.............................................5
Gas Response....................................................................................5
Initial Action........................................................................6
Long Term Characteristics.............................................................6
Life Expectancy..............................................................................6
Reliability
Gas Exposure Test............................................................................7
High Temperature/Humidity Test......................................................7
Heat Cyle Test...................................................................................8
Low Temperature Test.........................................................................8
High Temperature Test.......................................................8
Heater On-Off Test.......................................................................9
Notes.............................................................................................9
IMPORTANT NOTE: OPERATING CONDITIONS IN WHICH FIGARO SENSORS ARE USED WILL VARY
WITH EACH CUSTOMER’S SPECIFIC APPLICATIONS. FIGARO STRONGLY RECOMMENDS
CONSULTING OUR TECHNICAL STAFF BEFORE DEPLOYING FIGARO SENSORS IN YOUR APPLICATION
AND, IN PARTICULAR, WHEN CUSTOMER’S TARGET GASES ARE NOT LISTED HEREIN. FIGARO
CANNOT ASSUME ANY RESPONSIBILITY FOR ANY USE OF ITS SENSORS IN A PRODUCT OR
APPLICATION FOR WHICH SENSOR HAS NOT BEEN SPECIFICALLY TESTED BY FIGARO.
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TGS4161 pdf
TECHNICAL INFORMATION FOR TGS4161
2-3 Humidity dependency
Figure 6 shows the humidity dependency of
TGS4161. As this figure illustrates, the sensor shows
very small dependency on humidity for both absolute
EMF and EMF values.
350
325
300
EMF (350ppm CO2)
100
75
50
2-4 Heater voltage dependency
Figure 7 shows the change in EMF at 350 ppm of CO2
according to variations in heater voltage (VH).
Note that 5.0±0.2 V as a heater voltage must be
maintained because variation in applied heater
voltage will cause the sensor’s characteristics to be
greatly changed from those shown as typical in this
brochure.
275
EMF (350ppm CO2 - 1000ppm CO2)
25
250 0
10 20 30 40 50 60 70 80 90
Relative Humidity (%)
Fig. 6 - Humidity dependency
(20˚C)
430
400
EMF (350ppm CO2 - 3500ppm CO2)
370
340
310
280
EMF (350ppm CO2)
250
220
4.4 4.6 4.8 5 5.2 5.4
Heater Voltage (V)
Fig. 7 - Heater voltage dependency
70
60
50
40
30
20
10
0
5.6
2-5 Gas response
Figure 8 shows the change pattern of absolute EMF
values when the sensor is placed into 1,000 and 2,000
ppm of CO2 for 10 minutes before being returned to
normal air. The response time to 90% of the saturated
level of EMF (350ppmCO2-1000ppm/2000ppm
CO2) is around 1.5 minutes while recovery to 90% of
the base level is around 2.5 minutes.
320
300
280
260
240
220
0
1000ppm
CO2
2000ppm
CO2
10 20 30
Time (min.)
Fig. 8 - Gas response speed
40
50
Revised 05/04
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