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PDF TGS2442 Data sheet ( Hoja de datos )
| Número de pieza | TGS2442 | |
| Descripción | Detection of Carbon Monoxide | |
| Fabricantes | ETC | |
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PRODUCT INFORMATION
TGS 2442 - for the detection of Carbon Monoxide
Features:
* 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
Applications:
* 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.
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.
Sensitivity Characteristics:
100
Air
Ethanol
Temperature/Humidity Dependency:
1000
50%RH
10 100
H2
Air
1 10
0.1 CO 1
CO 30ppm
CO 100ppm
0.01
1
10 100 1000
Gas Concentration (ppm)
10000
CO 300ppm
0.1
-20 -10 0 10 20 30 40 50 60
Temperature (˚C)
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  
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TECHNICAL INFORMATION FOR TGS2442
1-5 Circuit &␣ operating conditions
The following conditions should be maintained to
ensure stable sensor performance:
Model number
Sensing element type
Standard package
Target gases
Typical detection range
Standard circuit
conditions
Heater voltage cycle
Circuit voltage cycle
Load resistance
VH
VC
RL
TGS 2442
M1
TO-5 metal can
Carbon monoxide
30 ~ 1000 ppm
VHH=4.8V±0.2V DC, 14ms
VHL=0V, 986ms
VC=0V for 995ms,
VC=5.0V±0.2V DC for 5ms
variable (≥10kΩ)
Heater resistance
RH
17 ± 2.5Ω at room temp.
Electrical characteristics
under standard test
conditions
Heater current
Heater power
consumption
Sensor resistance
Sensitivity
(change ratio of Rs)
Test gas conditions
IH
PH
Rs
β
Standard test conditions Circuit conditions
Conditioning period before
test
approx. 203mA(in case of VHH)
approx. 14mW (ave.)
6.81 kΩ ~ 68.1 kΩ in 100ppm of
carbon monoxide
0.23 ~ 0.49
Carbon monoxide in air
at 20±2˚C, 65±5%RH
Same as Std. Circuit Condition
(above)
> 2 days (under review)
Formula for calculation of sensor resistance:
Rs =
Vc x RL
Vout
- RL
Sensitivity (change ratio of Rs) is calculated with two measured values of
Rs as follows:
β = Rs (CO,300ppm)
Rs (CO,100ppm)
To facilitate usage of this sensor, TGS2442 is shipped in presorted
groupings which have a more narrowly defined range of β:
Code:
A: 0.23~ 0.34
B: 0.26 ~ 0.37
C: 0.29 ~ 0.40
D: 0.32 ~ 0.43
E: 0.35 ~ 0.46
F: 0.38 ~ 0.49
The above six classification will be further subdivided into the
following rankings of Rs values in 100ppm of CO:
Code: 1: 6.81 ~ 21.5kΩ 3: 14.7 ~ 46.6kΩ
2: 10.0 ~ 31.6kΩ 4: 21.5 ~ 68.1kΩ
1-6 Mechanical Strength
The sensor shall have no abnormal findings in its
structure and shall satisfy the above electrical
specifications after the following performance tests:
Withstand Force - withstand force > 5kg in each
(pin from base) direction
Vibration - frequency--10-500Hz (equiv. to
10G), duration-6 hours, x-y-z
direction
Shock - acceleration-100G, repeat 5 times
1-7 Dimensions (see Fig. 4)
Revised 03/00
Figure 3 - Circuit voltage and heater voltage cycles
Top View
ø9.2±0.2
ø8.1±0.2
ø0.3
5.9 ø6.0+0,-0.3
0.2
1.5
ø0.55±0.05
12.7±0.5
10.0±1.0
45˚
41
32
ø5.1±0.1
Bottom view
Figure 4 - Dimensions
3
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TECHNICAL INFORMATION FOR TGS2442
4-2 Long-term stability
Figure 16 shows long-term stability data for TGS2442.
Test samples were energized in normal air and under
standard circuit conditions. Measurement for
confirming sensor characteristics was conducted
under standard test conditions (20˚C, 65%RH). The
initial value was measured after four days of
energizing in normal air at the rated voltage. The Y-
axis shows the ratio between measured sensor
resistance and the initial (Day 4) resistance value,
each in 100ppm of CO. Additional data will be
published as it becomes available.
1000
100
10
1
0.1
0
Air
CO 30ppm
CO 100ppm
CO 300ppm
H2 1000ppm
EtOH 1000ppm
50 100 150 200 250 300 350
Time (days)
Figure 16 - Long term stability
(Ro = Rs in 100ppm of CO at Day 4)
4-3 Corrosion test
To demonstrate the durability of TGS2442 against
corrosion, samples were subjected to test conditions
called for by UL2034, Sec. 57-Corrosion Test. Over a
three week period, a mixture of 100ppb of H2S, 20ppb
of Cl2, and 200ppb of NO2 was supplied to the sensor
at a rate sufficient to achieve an air exchange of 5
times per hour. When compared to reference samples
not subjected to these corrosive gases, no significant
difference can be noticed.
4-4 Variable ambient temperature test
To show the ability of TGS2442 to withstand the
effects of high and low temperatures representative
of shipping and storage, the sensor was subjected to
the test conditions of UL2034 Sec. 44.2-Effect of
Shipping and Storage. Unenergized test samples
were subjected to 70˚C for 24 hours, allowed to cool
to room temperature for 1 hour, subjected to -40˚C
for 3 hours, and then allowed to warm up to room
temperature for 3 hours. When compared to
reference samples not subjected to these temperature
extremes, no significant difference can be noticed.
10
Test
1
CO 30ppm (ref)
CO 100ppm (ref)
CO 300ppm (ref)
CO 30ppm (test)
CO 100ppm (test)
CO 300ppm (test)
0.1
0
5 10 15 20 25 30
Time (days)
Figure 17 - Durability against corrosion
(Ro = Rs in 100ppm of CO at Day 2)
35
40
CO 30ppm (ref)
CO 100ppm (ref)
CO 300ppm (ref)
CO 30ppm (test)
CO 100ppm (test)
10 CO 300ppm (test)
Test
3 hrs. after test
1
0.
0 5 10 15 20 25
Time (days)
Figure 18 - Variable ambient temperature test
(Ro = Rs in 100ppm of CO at Day 0)
30
Revised 03/00
9
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| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet TGS2442.PDF ] | |
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