MP-7 Smoke Gas Sensor
Principle Introduction:
MP-7 model with advanced planar construction is comprised of heater and metal oxide semiconductor material of subminiature Al2O3 ceramic plate, fetch out electrode down-lead, encapsulation in metal base and cap. When the target gas exists , the sensor’s conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, convert change of conductivity to correspond output signal of gas concentration.
Applications :
Domestic smoke leakage alarm, industrial smoke gas alarm and portable smoke detector.
Technical parameters :
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Model |
MP-7 |
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Sensor Type |
Flat Surfaced Semiconductor |
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Standard Encapsulation |
Metal Cap |
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Target Gas |
C3H8, smoke |
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Detection range |
200~10000ppm C3H8 |
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Standard Circuit
Conditions |
Loop Voltage |
Vc |
≤10V DC |
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Heater Voltage |
VH |
5V±0.1V AC or DC |
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Load Resistance |
RL |
Adjustable |
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Sensor character under standard test conditions |
Heater Resistance |
RH |
105Ω±10Ω (room tem.) |
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Heater consumption |
PH |
≤240mW |
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Sensitivity |
S |
Ro(in air)/Rs( in 2000ppm C3H8)≥3 |
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Output voltage |
Vs |
2.5V~4.0V (in 2000ppm C3H8) |
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Concentration Slope |
α |
≤0.6(R3000ppm/R500ppm C3H8) |
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Environment Conditions |
Operation Temp. |
Tao |
-10℃~50℃ |
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Storage Temp. |
Tas |
-20℃~70℃ |
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Relative Humidity |
RH |
Less than 95%RH |
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O2 concentration |
O2 |
21%±1%(can’t less than 18%)
O2 concentration effects sensor’s performance. |
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Preheat time |
Not less than 48 hours |
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