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PDF TGS4160 Data sheet ( Hoja de datos )
| Número de pieza | TGS4160 | |
| Descripción | Carbon Dioxide Detection | |
| Fabricantes | Figaro | |
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PRODUCT INFORMATION
TGS 4160 - for the detection of Carbon Dioxide
Features:
* High selectivity to CO2
* Compact size
* Low dependency on humidity
* Long life
Applications:
* Air quality control
* Fermentation process control
The TGS4160 is a hybrid sensor unit composed of a carbon dioxide sensitive
element and a thermistor. The CO2 sensitive element consists of a solid
electrolyte formed between two electrodes, together with a printed heater (Pt)
substrate. By monitoring the change in electromotive force (EMF) generated
between the two electrodes, it is possible to measure CO2 gas concentration.
Adsorbent (zeolite) is filled between the internal cover and the outer cover for
the purpose of reducing the influence of interference gases.
TGS4160 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.
The figure below represents typical sensitivity characteristics of
TGS4160. 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:
80
CO2
CO
EtOH
60
The figure below shows typical humidity dependency for an
energized sensor. 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:
430 70
400 60
370 EMF (350ppm CO2) 50
340 40
40
310 30
20
280 ∆EMF (350ppm CO2 - 1000ppm CO2)
20
250 10
0
100
1000
Gas Concentration (ppm)
10000
220
0
20 40 60 80
Relative Humidity (%)
0
100
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 page  
TECHNICAL INFORMATION FOR TGS4160
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.
Top view
F I G A RO
ø 17.7±1.0
T G S 4160
ø 24.1±1.0
6.0 ± 0.5
Green Dot
1-5 Basic measuring circuit
Figure 2 shows the basic measuring circuit for
TGS4160. 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
measured using an operational amplifier with high
impedance (more than 100GΩ) and low bias current
(less than 1 pA) such as Texas Instruments’ model
No. TLC 271. Since the solid electrolyte type sensor
functions as a kind of battery, its absolute EMF value
would drift using this basic circuit. However, the
change of EMF value (∆EMF) maintains a stable
relationship with the changes in CO2 concentration.
Therefore, in order to obtain an accurate measure-
ment of CO2, a special microprocessor for signal
processing should be used with TGS4160. A special
evaluation sensor module which performs the requir-
ed signal processing (AM-4) is available from Figaro.
See Technical Information of AM-4 for further details.
1-6 Circuit &␣ operating conditions
The ratings shown below should be maintained at
all times to insure stable sensor performance:
Item
Specification
Side view
24.3 ±1.0
6.0 ± 0.5
5.8 ± 0.3
White Dot
Bottom view
6
5
4
1
2
3
45˚ ± 1˚30'
ø1.0 ± 0.1
45˚ ± 1˚30'
ø9.5 ± 0.2
Fig. 3 - Sensor dimensions
NOTE: When the sensor is powered, the typical resistance value
of the internal thermistor is around 8.0kΩ due to heat radiated
from the heater. Therefore, the change ratio of thermistor resistance
(RT/RTo) should be used for compensating the temperature
dependency of TGS4160 instead of using the absolute resistance
value of the internal thermistor.
Heater voltage (VH)
Heater resistance (RH) - room temp.
Heater current
Heater power consumption
Resistance of internal thermistor
B constant of internal thermistor
Operating conditions
Storage conditions
Optimal detection concentration
5.0V ± 0.2V DC
11.5 ± 1.1Ω
approx. 250mA
approx. 1.25W
100kΩ ± 5%
3450 ± 2%
-10˚C ~ +50˚C, 5 ~ 95%RH
-20˚C ~ +60˚C, 5 ~ 90%RH
300 ~ 5,000ppm
1-7 Specifications NOTE 1
Item
Specification
EMF in 350ppm of CO2
220 ~ 490mV
∆EMF
EMF (350ppmCO2) -
EMF (3500ppm CO2)
44 ~ 72mV
NOTE 1: Sensitivity characteristics are obtained under the
following standard test conditions:
(Standard test conditions)
Temperature and humidity: 20 ± 2˚C, 65 ± 5% RH
Circuit conditions: VH = 5.0±0.05V DC
Preheating period: 7 days or more under standard circuit conditions
Revised 03/00
3
5 Page 
TECHNICAL INFORMATION FOR TGS4160
3-6 Ethanol exposure test
To eliminate the influence of interference gases such
as an ethanol vapor, a zeolite filter is installed in the
cap of TGS4160. To demonstrate the effectiveness of
the zeolite filter, the sensor was exposed in 3% of
ethanol gas for a period of 600 days. During this test,
∆EMF values of ethanol were measured. ∆EMF is
defined as follows:
∆EMF=EMF1 - EMF2
where
EMF1=EMF in 350ppm CO2
EMF2=EMF in 350 ppm CO2 and 300ppm EtOH
The results of the above test are shown in Figure 16.
As the stable ∆EMF values show, the zeolite filter
has sufficient ability to eliminate the influence of
interference gases over an extended period of time.
40
20
0
-20
-40
0 100 200 300 400 500 600 700
Time (days)
Fig. 16 -Effect of ethanol exposure
3-7 Effect of exposure to high CO2 concentration
Figure 17 shows the sensor characteristics of TGS4160
in high concentrations of CO2. This data suggests that
TGS4160 can detect CO2 in excess of 100000ppm.
However, it should be noted that the ∆EMF values
would likely devitae from their initial values after
exposure to high concentrations of CO2. This would
occur due to a shift in the chemical equilibrium
between the sensing electrode and CO2 gas.
4. Notes
The following cautions regarding storage and
installation of TGS4160 should be observed to
prevent permanent damage to the sensor:
1) Install/store indoors, avoiding dew condensation,
silicone vapor, and exposure to alkaline metals (Na,
Li, etc.).
2) Avoid places where vibration or mechanical shock
may occur.
3) The sensor should not be stored in high humidity
or temperature conditions. Sensors should be stored
in an aluminum-coated sealing bag together with
desiccant.
4) The sensor should be mounted on circuit board
using manual soldering.
400
350
300
250
200
150
100
1000
10000
CO2 concentration (ppm)
100000
Fig. 17 - Effect of exposure to high CO2 concentrations
Revised 03/00
9
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| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet TGS4160.PDF ] | |
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