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FIGARO
PRODUCT INFORMATION
TGS 2201 - for detection of Gasoline and Diesel Exhaust Gas
Features:
* Dual sensor element * High sensitivity to exhaust gases emitted by both gasoline and diesel-fueled engines * Long life and low cost * Uses simple electrical circuit
Applications:
* Automobile ventilation control
The sensing element is comprised of a metal oxide semiconductor layer formed on an alumina substrate of a sensing chip together with an integrated heater. In the presence of a detectable gas, the sensor's conductivity changes depending on the gas concentration in the air. A simple electrical circuit can convert the change in conductivity to an output signal which corresponds to the gas concentration. The TGS 2201 contains two independent sensing elements on one substrate and produces separate output signals for responding to diesel and gasoline exhaust gases. This feature makes TGS2201 is an ideal senor for application in automatic damper control systems for automobile ventilation. Element 1 - Diesel exhaust gas A major component of diesel exhaust gas is NOx. The figure below represents typical sensitivity characteristics for Element 1, all data having been gathered at standard test conditions (see reverse side of this sheet). The Y-axis is indicated as sensor resistance ratio (Rs/Ro) which is defined as follows: Rs = Sensor resistance in displayed gases at various concentrations Ro = Sensor resistance in clean air Sensitivity Characteristics:
100
Sensor resistance ratio (Rs/Ro)
10
NO2
Sensor resistance ratio (Rs/Ro)
w
0.1
w
.D w
Air
t a
S a
Element 2 - Gasoline exhaust gas Gasoline exhaust gas typically contains CO, H2, and uncombusted hydrocarbons. The figure below represents typical sensitivity characteristics for Element 2, all data having been gathered at standard test conditions (see reverse side of this sheet). The Y-axis is indicated as sensor resistance ratio (Rs/ Ro) which is defined as follows: Rs = Sensor resistance in displayed gases at various concentrations Ro = Sensor resistance in clean air Sensitivity Characteristics:
10
e h
t e
U 4
.c
m o
1
Air
CO .1
1
While ethanol is not a component of gasoline exhaust, its sensitivity curve is considered representative of various uncombusted hydrocarbons.
.1 .01
1 Gas concentration (ppm)
10
.01 1
1 10 Gas concentration (ppm)
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.
w
w
w
.D
a
aS t
ee h
H2
4U t
100
om .c
EtOH
(+)
Basic Measuring Circuit:
The sensor requires two voltage inputs: heater voltage (VH) and circuit voltage (VC). The heater voltage (VH) is applied to the integrated heater in order to maintain the sensing element at a specific temperature which is optimal for sensing. Vc is applied to measure output voltages VRL1 and VRL2 across RL1 and RL2 respectively. Each of these load resistors are connected in series to
their corresponding sensing elements. A common power supply circuit can be used for both VC and VH to fulfill the sensor's electrical requirements. The value of the load resistor (RL) should be chosen to optimize the alarm threshold value, keeping power dissipation (PS) of the semiconductor below a limit of 15mW. Power dissipation (PS) will be highest when the value of Rs is equal to RL on exposure to gas.
2
VH
VC
4
GAS
3 1
VRL1 RL2
(-)
RL1 VRL2
Specifications:
Model number Sensing element type Standard package Target gases Typical detection range Heater voltage Standard circuit conditions Circuit voltage Load resistance Heater resistance Heater current Electrical Heater power characteristics under standard test consumption conditions Sensor resistance VH VC RL RH IH PH Rs TGS 2201 S2 Plastic (P3)
Diesel exhaust (NO, NO2) Gasoline exhaust (CO,H2,HC)
Structure and Dimensions:
unit : mm Stainless steel gauze Plastic cap
O14.50.5
0.1 ~ 10 ppm
10~1,000ppm
Sensing element 1 Sensing element 2
7.00.35V DC 15.0V DC Max., Ps 15mW
12.50.2
Variable, Ps 15mW 65 6 at room temp. 72mA 505mW VH = 7.0V DC
0.5
4.20.2
0.80.1
1.4
Lead frame
2.54
250k in air**
Rs(0.3ppm of NO2) =2.5** Rs (air)
25k in air**
Rs(10ppm of H2) =0.35** Rs (air)
2.54 2.54
Sensitivity (change ratio of Rs) Test gas conditions Standard test conditions Circuit conditions Conditioning period before test
The value of power dissipation (PS) can be calculated by utilizing the following formula: (VC - VRL)2 PS = RS
0.250.05
Air at 202C, 655%RH
RL = 200k1% RL = 10.0k1% VC = 7.00.2V DC, VH = 7.00.2V DC
12
34
7 days
Pin connection 1: Sensor electrode 1(-) 2: Common(+) 3: Sensor electrode 2(-) 4: Heater(-)
** Typical values for reference only - final specifications to be determined.
Sensor resistance (Rs) is calculated with a measured value of VRL by using the following formula: RS = VC - VRL x RL VRL
For information on warranty, please refer to Standard Terms and Conditions of Sale of Figaro USA Inc.
FIGARO USA, INC. 3703 West Lake Ave. Suite 203 Glenview, Illinois 60025 Phone: (847)-832-1701 Fax: (847)-832-1705 email: figarousa@figarosensor.com
REV: 9/99

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