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VOCs Sensor – for the detection of Formaldehyde, Tolune, Organic Solvent
1.
Sensitivity characteristic slope
1.
0
1.
0
1.
0
Sensitivity(Rgas/Rair)
0.
9
Sensitivity(Rgas/Rair)
0.
8
0.
8
Sensitivity(Rgas/Rair)
Formaldehyde
0.
9
0.
9
Toluene
0.
8
0.
7
0.
7
Benzene
0.
7
0.
6
0.
6
0.
6
0.
5 0.
1
1
0.
5 0.
1
1
0.
5 0.
1
1
Concentration(ppm)
Concentration(ppm)
Concentration(ppm)
2.
Basic Measuring Circuit & Stability
Vcc
●
Long Term Stability
5
Sensor VH
●
○
Output
Voltage[ Volt ]
Rs
4 3 2 1
RL=2㏀ Rs=4㏀
RL GND
●
Vout
○
Vcc : Circuit
Voltage(5V) VH : Heater
Voltage(5V) RL : Load Resistance Rs : Sensor Resistance 0 20 40 60
Time[days]
80
100
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