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FIGARO
PRODUCT INFORMATION
TGS 2201 - for detection of Gasoline and Diesel Exhaust Gas
Features:
Applications:
* Dual sensor element
* Automobile ventilation control
* High sensitivity to exhaust gases emitted
by both gasoline and diesel-fueled
engines
* Long life and low cost
* Uses simple electrical circuit
mThe sensing element is comprised of a metal oxide semiconductor layer formed
oon an alumina substrate of a sensing chip together with an integrated heater.
In the presence of a detectable gas, the sensor's conductivity changes
.cdepending 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.
UThe TGS 2201 contains two independent sensing elements on one substrate
t4and 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.
eeElement 1 - Diesel exhaust gas
A major component of diesel exhaust gas is NOx. The figure
hbelow represents typical sensitivity characteristics for Element
1, all data having been gathered at standard test conditions (see
Sreverse side of this sheet). The Y-axis is indicated as sensor
resistance ratio (Rs/Ro) which is defined as follows:
taRs = Sensor resistance in displayed gases at
various concentrations
Ro = Sensor resistance in clean air
aSensitivity Characteristics:
.D100
Element 2 - Gasoline exhaust gas
Gasoline exhaust gas typically contains CO, H2, and uncom-
busted 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
ww10
NO2
1
Air
w .comCO
t4U1 Air .1
H2
heeWhile ethanol is not a component of gasoline exhaust,
its sensitivity curve is considered representative of
Svarious uncombusted hydrocarbons.
EtOH
ta.1
a.01 0.1
1
.DGas concentration (ppm)
10
.01
1
1 10
Gas concentration (ppm)
100
IMPORTANT NOTE: OPERATING CONDITIONS IN WHICH FIGARO SENSORS ARE USED WILL VARY WITH EACH CUSTOMER’S SPECIFIC APPLICATIONS. FIGARO STRONGLY
wRECOMMENDS CONSULTING OUR TECHNICAL STAFF BEFORE DEPLOYING FIGARO SENSORS IN YOUR APPLICATION AND, IN PARTICULAR, WHEN CUSTOMER’S TARGET GASES
wARE 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
wSPECIFICALLY TESTED BY FIGARO.

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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.
(+)
VH
2
VC
4
31
GAS
VRL1
RL2 RL1 VRL2
(–)
Specifications:
Model number
TGS 2201
Sensing element type
Standard package
Target gases
Typical detection range
Standard circuit
conditions
Heater voltage
Circuit voltage
Load resistance
VH
VC
RL
S2
Plastic (P3)
Diesel exhaust
(NO, NO2)
Gasoline exhaust
(CO,H2,HC)
0.1 ~ 10 ppm 10~1,000ppm
7.0±0.35V DC
15.0V DC Max., Ps 15mW
Variable, Ps 15mW
Heater
resistance
RH
65 ± 6at room temp.
Electrical
characteristics
under standard test
conditions
Heater current
Heater power
consumption
Sensor
resistance
IH 72mA
PH
505mW
VH = 7.0V DC
Rs 250kin air** 25kin air**
Sensitivity
(change ratio of Rs)
Rs(0.3ppm of NO2) =2.5** Rs(10ppm of H2) =0.35**
Rs (air)
Rs (air)
Test gas conditions
Air
at 20±2˚C, 65±5%RH
Standard test
conditions
Circuit conditions
RL = 200kΩ±1% RL = 10.0kΩ±1%
VC = 7.0±0.2V DC, VH = 7.0±0.2V DC
Conditioning period
before test
7 days
** Typical values for reference only - final specifications to be determined.
The value of power dissipation (PS) can Sensor resistance (Rs) is calculated with
be calculated by utilizing the following a measured value of VRL by using the
formula: PS = (VC - VRL)2
RS
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.
REV: 9/99
Structure and Dimensions:
unit : mm
Stainless
steel gauze
Plastic cap
Ó14.5±0.5
Sensing element 1
Sensing element 2
0.8±0.1
12.5±0.2
0.5
4.2±0.2
Lead frame
1.4
2.54
2.54
2.54
1 2 34
0.25±0.05
Pin connection
1: Sensor electrode 1(-)
2: Common(+)
3: Sensor electrode 2(-)
4: Heater(-)
FIGARO USA, INC.
3703 West Lake Ave. Suite 203
Glenview, Illinois 60025
Phone: (847)-832-1701
Fax: (847)-832-1705
email: figarousa@figarosensor.com