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TGS4161 Datasheet Preview

TGS4161 Datasheet

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.
1




Figaro

TGS4161 Datasheet Preview

TGS4161 Datasheet

Technical Information for Carbon Dioxide Sensors

No Preview Available !

TECHNICAL INFORMATION FOR TGS4161
1. Basic Information and Specifications
1-1 Features
* High selectivity to carbon dioxide
* Low humidity dependency
* Small size
* Low power consumption
* Long life
1-2 Applications
* Air quality control
1-3 Structure
Figure 1 shows the structure of TGS4161. The CO2
sensing element consists of a cation (Na+) solid
electrolyte formed between two electrodes together
with a printed heater (RuO2) substrate. The cathode
(sensing element) consists of lithium carbonate and
gold, while the anode (counter electrode) is made of
gold. The anode is connected to sensor pin No.3
(“S(+)”) while the cathode is connected to pin No.2
(“S(-)”). A RuO2 heater connected to pins No.1 (“H”)
and No.4 (“H”) heats the sensing element. Lead wires
are made of Pt and are connected to nickel pins.
1-4 Operation principle
When the sensor is exposed to CO2 gas , the following
electrochemical reaction occurs:
Cathodic reaction: 2Li+ + CO2 + 1/2O2 + 2e- = Li2CO3
Anodic reaction: 2Na+ + 1/2O2 + 2e- = Na2O
Overall chemical reaction:
Li2CO3 + 2Na+ = Na2O + 2Li+ + CO2
As a result of the electrochemical reaction, electro-
motive force (EMF) would be generated according
to Nernst’s equation:
EMF = Ec - (R x T) / (2F) ln (P(CO2))
where
P(CO2) : Partial pressure of CO2,
Ec : Constant value
R : Gas constant
T : Temperature (K) F : Faraday constant
By monitoring the electromotive force (EMF)
generated between the two electrodes, it is possible
to measure CO2.
1-5 Basic measuring circuit
Figure 2 shows the basic measuring circuit for
TGS4161. The sensor requires that heater voltage (VH)
be applied to the integrated heater in order to
maintain the sensing element at the optimal temp-
erature for sensing. The sensor’s EMF should be
Revised 05/04
Stainless steel gauze
Metal cap
Lead pin
1.5 mm
Sensor element
Solid
electrolyte
Lead wire
Glass
Sensing Counter
electrode electrode
(Solid electrolyte side)
Heater
Electrode Substrate
(Heater side)
Fig. 1 - Sensor structure
(+)
VH
41
(-) RH
32
VEMF
Operational amplifier:
Input impedance > 100G
Bias current < 1pA
+
-
Vout
Fig. 2 - Basic measuring circuit
NOTE: Pins 1 and 4 must be connected as shown in the drawing
because of the specific polarity of VH.
2


Part Number TGS4161
Description Technical Information for Carbon Dioxide Sensors
Maker Figaro
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TGS4161 Datasheet PDF






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