MQ-2 gas sensor detects smoke methane butane analog sensor (H1B5)
First・size : 32mm X22mm X27mm length X width X height
Second・the main chip : LM393・ZYMQ-2 gas sensor
Third・the working voltage : DC 5 V
Four characteristics:
1・having a signal output instruction .
2・the dual signal output ( analog output and TTL level output )
3・0 ~ 5V analog output voltage・the higher the concentration・the higher voltage.
4・liquefied petroleum gas・natural gas・city gas・smoke have better sensitivity.
5・with a long life and reliable stability
6・rapid response and recovery characteristics
V. Application :
For home or factory gas leakage monitoring device・suitable for liquefied petroleum gas・butane・propane・methane・alcohol・hydrogen・smoke and other monitoring devices.
MQ-2 gas sensor parameters :
?
?
A. Standard Operating Conditions
?
?Connection mode:
1・VCC: is connected to the positive pole (5V)
2・GND: with the negative electrode of the power
3・the DO:TTL switch signal output
4・AO: output signal
Symbol | Parameter name | Technical conditions | Remark |
Vc | Circuit voltage | ＋15V | AC or DC |
VH | Heating voltage | 5.0V＼0.2 V | AC or DC |
RL | Load Resistance | Adjustable | ? |
RH | Heating resistors | 31Ω＼3Ω | Room temperature |
PH | Heating power | ＋900mW | ? |
?
B. Environmental Conditions
?
?
Symbol | Parameter name | Technical conditions | Remark |
Tao | Temperature | -10＜-50＜ | ? |
Tas | Storage temperature | -20＜-70＜ | |
RH | Relative humidity | Less than 95% RH | |
O2 | Oxygen concentration | 21% ( standard conditions ) Oxygen concentration can affect sensitivity | A minimum value greater than 2% |
?
C. sensitivity characteristics
?
?
Symbol | Parameter name | Technical parameters | Remark |
Rs | Sensitive surface resistivity | 3KΩ-30KΩ (1000ppm isobutane ) | Probe concentration range 100ppm-10000ppm LPG and propane 300ppm-5000ppm Butane 5000ppm-20000ppm methane 300ppm-5000ppm hydrogen 100ppm-2000ppm alcohol |
α (3000/1000) Isobutane | Concentration slope | ??????? ＋0.6 | |
Standard Operating Conditions | Temperature : 20＜ ＼2＜Vc: 5.0V＼0.1V Relative humidity : 65%＼5% Vh: 5.0V＼0.1V | ||
Warm-up time | No more than one hour | ||
?