1/2
VOCs Sensor – for the detection of Formaldehyde, Tolune, Organic Solvent
1. Sensitivity characteristic slope
1.0
...
1/2
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
http://www.Datasheet4U.com
2/3
3. Specifications
Model number Sensing element type Target gas RH Electrical characteristics under standard Test conditions VH RL PH VC Sensitivity Characteristics β = Rs,gas/Rs,air ΔV = Vout,air – Vout,gas Heater resistance Heater
Voltage Road resistance Power consumption Circuit
Voltage S Semiconductor VOCs, HC, Smoke, Organic compounds 25.5Ω±0.2Ω 5.0V±2% Variable Less than 420㎽ Less than12.0V 1.7㏀ to 24 ㏀ (Refer to Rank Table) 0.4≤β≤0.6 β≤0.4 Reaction : less than 5sec Recovery : less than 10sec Less than 430㎽
Rs,air Sensor resistance Vout,air β ΔV Toluene :5ppm Smoke:1,000ppm (ESSE, Korea) Response time
* Standard test condition (balance gas : clean air, or special gas) ㆍTemp. : 20℃±5℃, ㆍ Humidity : RH65%±10%, ㆍ Pressure : 1atm ㆍTest chamber : more than 1ℓ/EA, ㆍ Pre-heating time : m...
