PRODUCT INFORMATION
PRODUCT INFORMATION
0.01
0.1
1
10
100
1 10 100 1000 10000
Rs/Ro
Gas Concentration (ppm)
Air
CO
Ethanol
H2
0.1
1
10
100
1000
-20 -10 0 10 20 30 40 50 60
Rs/Ro
Temperature (˚C)
Air
CO 30ppm
CO 100ppm
CO 300ppm
50%RH
Applications:
Features:
TGS 2442 - for the detection of Carbon Monoxide
The figure below represents typical sensitivity characteristics,
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 of displayed gases at
various concentrations
Ro = Sensor resistance in 100ppm CO
The figure below represents typical temperature and humidity
dependency characteristics. Again, the Y-axis is indicated as
sensor resistance ratio (Rs/Ro), defined as follows:
Rs = Sensor resistance at 30ppm, 100ppm and 300ppm
of CO at various temperatures and 50%R.H.
Ro = Sensor resistance at 300ppm of CO
at 25°C and 50% R.H.
* CO detectors
* Air quality controllers
* Indoor parking lot ventilation
TGS 2442 utilizes a multilayer sensor structure. A glass layer for thermal insulation is
printed between a ruthenium oxide (RuO2) heater and an alumina substrate. A pair of
Au electrodes for the heater are formed on a thermal insulator. The gas sensing layer,
which is formed of tin dioxide (SnO2), is printed on an electrical insulation layer which
covers the heater. A pair of Au electrodes for measuring sensor resistance are formed
on the electrical insulator. Activated charcoal is filled between the internal cover and
the outer cover for the purpose of reducing the influence of noise gases.
TGS 2442 displays good selectivity to carbon monoxide, making it ideal for CO
monitors. In the presence of CO, the sensor's conductivity increases depending
on the gas concentration in the air. A simple pulsed electrical circuit operating on a
one second circuit voltage cycle can convert the change in conductivity to an output
signal which corresponds to gas concentration.
* Low power consumption
* High sensitivity/selectivity to
carbon monoxide (CO)
* Miniature size
* Low sensitivity to alcohol vapor
* Long life and low cost
* Low humidity dependency
Temperature/Humidity Dependency:
Sensitivity Characteristics:
IMPORTANT NOTE: OPERATING CONDITIONS IN WHICH FIGARO SENSORS ARE USED WILL VARY WITH EACH CUSTOMER’S SPECIFIC APPLICATIONS. FIGARO STRONGLY REC-
OMMENDS 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.
PRODUCT INFORMATION
PRODUCT INFORMATION
Basic Measuring Circuit:
The value of sensitivity (β) is calculated with two measured
values of Rs as follows:
Sensor resistance (Rs) is calculated with a measured value
of Vout as follows:
Rs = - RL
Specifications:
Vout
rebmunledoM 2442SGT
epyttnemelegnisneS 1M
egakcapdradnatS naclatem5-OT
sesagtegraT edixonomnobraC
egnarnoitcetedlacipyT mpp0001~03
tiucricdradnatS
snoitidnoc
elcycegatlovretaeH
VHVHH V8.4= ±sm41,CDV2.0
VLH sm689,0.0=
elcycegatlovtiucriC
VCVC,sm599rofV0=
VCV0.5= ±sm5rofCDV2.0
ecnatsiserdaoL
RL(elbairav ≥k01 Ω)
scitsiretcarahclacirtcelE
tsetdradnatsrednu
snoitidnoc
ecnatsiserretaeH
RH71 ±5.2 Ω.pmetmoorta
tnerrucretaeH
IHVfoesacni(Am302.xorppa HH )
rewopretaeH
noitpmusnoc PH).eva(Wm41.xorppa
ecnatsiserrosneS sR k3.31 Ωk331~ Ωfompp001ni
edixonomnobrac
ytivitisneS
)sRfooitaregnahc( β
13.0~31.0
snoitidnoctsetdradnatS
snoitidnocsagtseT rianiedixonomnobraC
02ta ±56,C˚2 ±HR%5
snoitidnoctiucriC noitidnoCtiucriC.dtSsaemaS
)evoba(
erofebdoirepgninoitidnoC
tset eromrosyad2
Rs (CO,300ppm)
Rs (CO,100ppm)
β =
Structure and Dimensions:
voltage cycle of 1 second. Each VH cycle
is comprised by 4.8V being applied to the
heater for the first 14ms, followed by 0V
pulse for the remaining 986ms. The Vc cycle
consists of 0V applied for 995ms, followed
by 5.0V for 5ms. For achieving optimal
sensing characteristics, the sensor's signal
should be measured after the midpoint of
the 5ms Vc pulse of 5.0V (for reference, see
timing chart below).
NOTE: Application of a Vc pulse condition
is required to prevent possible migration of
heater materials into the sensing element
material. Under extreme conditions of high
humidity and temperature, a constant Vc
condition could result in such migration and
cause long term drift of Rs to higher values.
A 5ms Vc pulse results in significantly less
driving force for migration than a constant
Vc condition, rendering the possibility of
migration negligibly small.
Circuit voltage (VC) is applied across the
sensing element which has a resistance (Rs)
between the sensor’s two electrodes (pins
No. 2 and No. 3) and a load resistor (RL)
connected in series. The sensing element
is heated by the heater which is connected
to pins No. 1 and No. 4.
Heating cycle--The sensor requires
application of a 1 second heating cycle
which is used in connection with a circuit
FIGARO USA INC.
121 S. Wilke Rd. Suite 300
Arlington Heights, IL 60005
Tel: 847-832-1701
Fax: 847-832-1705
email: figarousa@figarosensor.com
Vcx RL
For information on warranty, please refer to Standard Terms and Conditions of Sale of
Figaro USA Inc.
REV: 07/07
unit;mm
�8.1±0.2
�0.3
�6.0+0,-0.3
�9.2±0.2
Top View
�5.1±0.1
Bottom View
1
23
4
7.25±0.4
12.7±0.5
10.0±1.0
�0.55±0.05
0.2
1.5±0.1
45o
0.3
Side View
unit: mm
