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PRODUCT INFORMATION
Features:
TGS 4161 - for the detection of Carbon Dioxide
Applications:
* Indoor air quality control * CO2 monitors
* High selectivity to CO2 * Compact size * Low dependency on humidity * Long life and low cost * Low power consumption
TGS4161 is a new solid electrolyte CO2 sensor which offers miniaturization and low power consumption. A range of 350~10,000ppm of carbon dioxide can be detected by TGS4161, making it ideal for indoor air control applications. The CO2 sensitive element consists of a solid electrolyte formed between two electrodes, together with a printed heater (RuO2) substrate. By monitoring the change in electromotive force (EMF) generated between the two electrodes, it is possible to measure CO2 gas concentration. The top of the sensor cap contains adsorbent (zeolite) for the purpose of reducing the influence of interference gases. TGS4161 exhibits a linear relationship between EMF and CO2 gas concentration on a logarithmic scale. The sensor displays good long term stability and shows excellent durability against the effects of high humidity. The figure below represents typical sensitivity characteristics of TGS4161. The Y-axis is indicated as EMF which is defined as follows: EMF=EMF1 - EMF2 where EMF1=EMF in 350 ppm CO2 EMF2=EMF in listed gas concentration Sensitivity Characteristics: The figure below shows typical humidity dependency of TGS4161. Again, the Y-axis is indicated as EMF which is defined as follows: EMF=EMF1 - EMF2 where EMF1=EMF in 350 ppm CO2 EMF2=EMF in 1000ppm CO2 Humidity Dependency:
100 80 60 EMF (mV) 40 20 0 10 100 1000 Gas Concentration (ppm) 10000
CO2 CO Ethanol H2
350
100
325 EMF (350ppm CO2) EMF (mV) 300
75
EMF (mV) 50
275 EMF (350ppm CO2 - 1000ppm CO2) 250
25
10
20
30
40
50
60
70
80
90
0
Relative Humidity (%)
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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Basic Measuring Circuit:
The TGS4161 sensor requires heater voltage (VH) input. The heater voltage is applied to the integrated heater in order to maintain the sensing element at a specific temperature which is optimal for sensing. Electromotive force (EMF) of the sensor should be measured using a high impedance (>100 G) operational amplifier with bias current < 1pA (e.g. Texas Instruments' model #TLC271). Since the solid electrolyte type sensor
functions as a kind of battery, the EMF value itself would drift using this basic measuring circuit. However, the change of EMF value (EMF) shows a stable relationship with the change of CO2 concentration. Therefore, in order to obtain an accurate measurement of CO2, a special microprocessor for signal processing should be used with TGS4161. Figaro can provide a special evaluation sensor module (AM-4-4161) for TGS4161.
Operational Amplifier IBIAS < typ. 1pA + 1 2 -
VH
EMF
4
3
TGS4161 GND
Specifications:
Model number TGS 4161
Structure and Dimensions:
Sensing element type
Solid electrolyte
Target gases
Carbon dioxide
Typical detection range
350 ~ 10,000 ppm
Heater resistance
RH
70 7 at room temp.
Top view
Heater current
Electrical characteristics
IH
approx. 50mA
Heater power consumption
PH
approx. 250mW
Electromotive force
E MF
220~490mV in 350ppm CO2
Sensitivity
EMF
44~72mV
EMF(350ppm CO2)EMF(3500ppm CO2)
Heater voltage
VH
5.0 0.2V (DC)
approx. 1.5 min. (to 90% of final EMF value)
Sensing element
o9.20.2 o8.10.2
Sensor characteristics
Response time
Measurement accuracy
approx. 20% at 1,000ppm CO2
12.41.0
Side view
Operating conditions
-10~50C, 5~95%RH
(store in moisture proof bag with silica gel)
Strorage conditions
-20~60C, 5~90%RH
Test gas condition
Standard test conditions
CO2 in air at 202C, 655%RH
Circuit condition
VH = 5.00.05V DC
10.01.0
Conditioning period before test
12 hours or longer
Sensing Element Structure:
o0.550.05
3.60.1
Bottom view
90
4 3
1 2
3.6.1 o5.1
Pin Connection: 1. Heater (+) 2. Counter electrode (+) 3. Sensing electrode (-) 4. Heater (-)
u/m = mm
For information on warranty, please refer to Standard Terms and Conditions of Sale of Figaro USA Inc.
FIGARO USA, INC. 121 S. Wilke Rd. Suite 300 Arlington Heights, IL 60005 USA Phone: (1)-847-832-1701 Fax: (1)-847-832-1705 email: figarousa@figarosensor.com
REV: 12/05

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