TGS2442 Datasheet, PDF (5/25 Pages) List of Unclassifed Manufacturers – Detection of Carbon Monoxide

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 VH
Circuit voltage cycle VC
Load resistance
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.
Heater current
IH
Electrical characteristics
under standard test
conditions
Heater power
consumption
PH
Sensor resistance
Rs
Sensitivity
(change ratio of Rs)
β
Test gas conditions
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˚
4
1
3
2
ø5.1±0.1
Bottom view
Figure 4 - Dimensions
3