Szczegóły Produktu:
|
Zakres wykrywania: | 5 - 500 ppm NH₃ | Standardowe warunki obwodu: | ≤ 24 V DC |
---|---|---|---|
Napięcie grzejnika (VH): | 5,0 V ± 0,1 V AC lub DC | Odporność na grzejnik (RH): | 29 Ω ± 3 Ω |
Zużycie grzejnika (pH): | ≤ 900 MW | Temperatura robocza: | - 10 ℃ - 45 ℃ |
Podkreślić: | MQ137 semiconductor gas sensor,NH₃ gas alarm sensor,domestic gas sensor with warranty |
MQ137 Semiconductor Gas Sensor For Domestic NH₃ Gas Alarms
Working Principle:
The sensitive material SnO₂ of the MQ137 gas sensor has lower conductivity in clean air. When ammonia gas is present, the sensor's conductivity increases with the rise of gas concentration. Users can convert the change of conductivity into a corresponding output signal of gas concentration through a simple circuit.
Applications:
Parameter |
Symbol |
Value |
Unit |
Remarks |
---|---|---|---|---|
Detection Range | - | 5 - 500 | ppm | For NH₃ |
Standard Circuit Conditions (Loop Voltage) | Vc | ≤ 24 | V DC | - |
Heater Voltage | Vh | 5.0 V ± 0.1 V | - | AC or DC |
Load Resistance | Rl | Adjustable | - | - |
Heater Resistance | Rh | 29 Ω ± 3 Ω | - | At room temperature |
Heater Consumption | Ph | ≤ 900 | mW | - |
Sensitivity | S | Rs (in air)/Rs (50 ppm NH₃) ≥ 2 | - | - |
Output Voltage | △Vs | ≥ 0.5 | V | In 50 ppm NH₃ |
Concentration Slope | α | ≤ 0.6 | - | R₂₀₀ ppm/R₅₀ ppm NH₃ |
Standard Test Temperature | - | 20℃ ± 2℃ | - | - |
Standard Test Humidity | - | 55% ± 5% | RH | - |
Pre-heat Time | - | Over 48 | hours | - |
Operating Temperature | - | -10 - 45 | ℃ | - |
Storage Temperature | - | -20 - 70 | ℃ | - |
Osoba kontaktowa: Miss. Xu
Tel: 86+13352990255