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PDF TGS203 Data sheet ( Hoja de datos )
| Número de pieza | TGS203 | |
| Descripción | Carbon Monoxide Sensor | |
| Fabricantes | ETC | |
| Logotipo |  |
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PRODUCT INFORMATION
TGS 203 - Carbon Monoxide Sensor Specifications
1. Structure and Dimensions
Please refer to the technical drawing shown in Figure 1.
Specifications for component parts subject to Table I below.
2. Materials
Part numbers are as indicated in the technical drawing of
Figure 1.
# Part
Material
1 Stainless Steel Gauze Stainless Steel SUS 304 (60 mesh)
2 Activated Charcoal
Filter
20 ~ 40-mesh
3 Cover
Polyamide resin reinforced
with glass fiber
4 Sensor Element
Metal oxide semiconductor
5 Flame-Proof Cover
Double layer of 100-mesh
stainless steel gauze SUS 316
6 Coil
Paladium-Iridium alloy wire
Diameter: 0.09mm
7 Base
Polyethylene terephthalate
reinforced with glass fiber
8 Ring
Nickel plated brass ring
9 Pin
Nickel
3. Explosion Proof
A spark inside the cover cannot ignite a gas leak out-
side of the cover.
4. Mechanical Strength
Connecting Strength
Using applied pressure, a ring is affixed to the base for
the purpose of holding the flame proof cover in a fixed
position.
Withdrawal Force
The pins can withstand a withdrawal force of more than
5 kgs applied in the direction of the pins.
1
2
3
4
5
6
7
8
9
Cross section of internal
sensing element
Figure 1
1 page  
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TECHNICAL INFORMATION FOR TGS203
1-5 Circuit &␣ operating conditions
The following conditions should be maintained to
ensure stable sensor performance:
Formula for calculation of sensor resistance:
Rs = Vc x RL
VRL
- RL
Formula for calculation of sensor power dissipation:
Item
Rating
Ps = Vc2Rs/(Rs + RL)2
Circuit Voltage (Vc)
Heater voltage (VH)
Heater current (IH)
Heater resistance (room temp.)
5.0V ± 1% DC
VHH = 0.8V ± 3% for 60±1 sec.
VHL = 0.25V ± 3% for 90±1 sec.
(apply alternately for specified period)
IHH = 369mA±3% +fo5r%60±1 sec.
IHL = 133mA±3% f-o7r%90±1 sec.
(apply alternately for specified period)
1.85Ω .
Load resistance (RL)
variable
Power dissipation (PS)
Signal detection timing
Operating & storage temp.
less than 15mW
within 0.5 sec. prior to
application of VHH
-40˚C ~ +70˚C
1-7 Mechanical Strength
The sensor shall have no abnormal findings in its
structure and shall satisfy the above electrical
specifications after the following performance tests:
Withdrawal Force - withstand force > 5kg in each
direction
Vibration - frequency-1000c/min., total
amplitude-4mm, duration-one
hour, direction-vertical
Shock - acceleration-100G, repeated 5
times
1-8 Dimensions
Optimal detection concentration
50ppm ~ 1000ppm
1-6 Specifications NOTE 1
Item
Sensor resistance (Rs-100ppm of CO)
Specification
1kΩ ~ 15kΩ
top view
Unless otherwise specified,
tolerance is ±0.5mm. Fig-
ures in parenthesis are for
reference (u/m: mm)
Sensor resistance gradient (α)
-1.50 ~ -0.73
α = log{Rs(100ppm of CO)/Rs(300ppm of CO)}
log(100ppm/300ppm)
Relative sensitivity to H2 (γ)
> 1.0
γ = Rs(1000ppm of H2)
Rs(100ppm of CO)
Power consumption
approx. 0.59W at VHH
approx. 0.07W at VHL
cross section
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: as specified in Section 5 and with
RL = 4.0kΩ ± 1%
Preheating period: 7 days or more under standard circuit
conditions
Revised 9/99
bottom view
Figure 4 - Dimensions
3/14
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TECHNICAL INFORMATION FOR TGS203
3-7 Effect of the activated charcoal filter
CO␣ is commonly generated by the incomplete
combustion of fossil fuels. For accurate detection of
CO, it is necessary to eliminate the influence not only
of alcohol in the atmosphere but also of NOx
generated by such heating devices. To do so, TGS203
utilizes a filter of activated charcoal.
Figures 14-1 and 14-2 show sensitivity characteristics
of TGS203 with and without the charcoal filter
respectively.
As shown in Figure 14-1, sensitivity to alcohol is
reduced by the filter and the influence of 50ppm of
NO2 is virtually eliminated. The sensitivity to
hydrogen is unaffected by the presence of the filter.
Note: Sensor resistance (Ro) in 100ppm of CO, which
is used as a reference value in Figures 14-1 and 14-2,
increases by approximately 50%~100% when
measured with the filter.
Temperature and humidity dependency remains
largely unaffected by the presence of the filter.
100
C2H5OH
10
H2
1
CO CO + 50ppm of NO2
0.1
10
100 1000
Gas Concentration (ppm)
Figure 14-1 - Gas sensitivity of TGS203
(with activated charcoal filter)
10000
100
10
CO + 50ppm
of NO2
1
H2
0.1
10
C2H5OH
CO
100 1000
Gas Concentration (ppm)
10000
Figure 14-2 - Gas sensitivity of TGS203
(without activated charcoal filter)
Revised 9/99
9/14
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