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TGS4161 Datasheet

CO2 Sensor

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PRODUCT INFORMATION
TGS 4161 - for the detection of Carbon Dioxide
Features:
Applications:
* High selectivity to CO2
* Compact size
* Low dependency on humidity
* Long life and low cost
* Low power consumption
* Indoor air quality control
* CO2 monitors
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:
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 listed gas concentration
∆EMF=EMF1 - EMF2
where
EMF1=EMF in 350 ppm CO2
EMF2=EMF in 1000ppm CO2
Sensitivity Characteristics:
100
CO2
80 CO
Ethanol
H2
60
∆EMF (m4V0)
Humidity Dependency:
350
325
EMF (m30V0)
EMF (350ppm CO2)
100
75
∆5E0MF (mV)
20
0
10
100 1000
Gas Concentration (ppm)
10000
275 25
∆EMF (350ppm CO2 - 1000ppm CO2)
250 0
10 20 30 40 50 60 70 80 90
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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TGS4161 Datasheet Preview

TGS4161 Datasheet

CO2 Sensor

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TGS4161 pdf
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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 GΩ) 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.
Specifications:
Model number
Sensing element type
Target gases
Typical detection range
Heater resistance
Heater current
Electrical characteristics
Heater power
consumption
Electromotive force
RH
IH
PH
EMF
Sensitivity
EMF
Heater voltage
VH
Sensor characteristics
Response time
Measurement accuracy
Operating conditions
Strorage conditions
Standard test
conditions
Test gas condition
Circuit condition
Conditioning period
before test
TGS 4161
Solid electrolyte
Carbon dioxide
350 ~ 10,000 ppm
70 ± 7at room temp.
approx. 50mA
approx. 250mW
220~490mV in 350ppm CO2
44~72mV
EMF(350ppm CO2)-
EMF(3500ppm CO2)
5.0 ± 0.2V (DC)
approx. 1.5 min.
(to 90% of final EMF value)
approx. ±20% at 1,000ppm CO2
-10~50˚C, 5~95%RH
-20~60˚C, 5~90%RH
(store in moisture proof bag with silica gel)
CO2 in air
at 20±2˚C, 65±5%RH
VH = 5.0±0.05V DC
12 hours or longer
Sensing Element Structure:
12
Operational Amplifier
IBIAS < typ. 1pA
+
-
VH EMF
4 3 TGS4161
GND
Structure and Dimensions:
Top view
Sensing
element
ø9.2±0.2
ø8.1±0.2
12.4±1.0
Side
view
10.0±1.0
ø0.55±0.05
For information on warranty, please refer
to Standard Terms and Conditions of Sale
of Figaro USA Inc.
REV: 12/05
90˚
4
3
3.6±0.1
Bottom
view
1
2
3.6±.1
ø5.1
Pin Connection:
1. Heater (+)
2. Counter electrode (+)
3. Sensing electrode (-)
4. Heater (-)
u/m = mm
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


Part Number TGS4161
Description CO2 Sensor
Maker Figaro
Total Page 2 Pages
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