Infinite L-COM SRAQ-G009 User manual

COMBUSTIBLE GAS SENSOR MODULE
User Guide for SRAQ-G009
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with this manual before powering the device. Please keep it handy for future reference. In case of any questions regarding the installation or use of
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M_L-com_SRAQ-G009_11/2022_R1.0
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Product Description
The SRAQ-G009 gas sensor module detects the presence and concentration of flammable gases such as butane, propane, methane as well as other
gases containing carbon monoxide. Integrated circuitry produces a non-linear voltage signal corresponding to the smoke and gas concentrations. With
high sensitivity, it can detect smoke in the range of 100-1000ppm and flammable gases in the range of 300  10,000 ppm.
Features
 Features MQ5 sensing element
 Highly sensitive to flammable gas
 Wide detection range 300  10000 ppm
 Analog and TTL level outputs
 2.54 mm 4 pin male header
Applications
 Flammable gas leakage alarms
 Industrial settings
 Chemical manufacturing
 Portable gas detectors
 Anywhere combustible gas concentration is a concern

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Technical Parameters
Electrical Diagram
 VCC is the 0  5 VDC power supply positive and negative; GND is the ground
 Aout is the analog output, Dout is the level output
 On the PCB, Indicator light on: Dout is low level. Indicator light off: Dout is high level
 The 1k resistor shown on the PCBA is the load resistance (RL), it can be changed by user. Due to the sensor itself the load resistance range
should be 100k  1M.
Mounting Diagram
Mount the PCBA to the enclosure with screws. Hole diameter 3mm, pitch distances as per the diagrams given below.
Working Voltage 5 VDC ± 0.2 V
Working Current <150 mA
Gas Detection Liquefied gas, methane, butane, LPG
Detection Concentration 300  10000ppm (CH4 LPG)
Zero Voltage 0.5  1.5 V (This voltage is output without CH4)
Preheating Time >30 mins
Response Time >3 sec
Recovery Time ≤60 sec
Output Mode
Aout (Analog) Non-linear, higher the concentration, higher the voltage
Dout (Level signal) Low level: 0V; High level: 3.7V
Work environment
Temperature -10~50 °C
Humidity ＜95% RH

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Notes
1. Confirm the polarity and the voltage of the power supply before powering ON the sensor.
2. The analog output of this module is non-linear. When connect to microcontroller, it should be connected to ADC interface of the microcontroller.
3. The relationship between the resistance ratio and the concentration is a logarithmic relationship. For more info on typical sensitivity curve, check
MQ5 Probe on internet.
Typical Sensitivity Curve
Temperature: 20 °C
Humidity: 65%
Oxygen: 21%
RL = 20 kΩ
Rs: Resistance in various concentration value of gas
R0: Resistance in clear air
The calculation of the resistance ratio according to the output voltage is as follows:
The sensor is energized in relatively clean air for more than half an hour and after measure the output voltage value of Aout.
VCC is the power supply voltage, 5 VDC
RL is the load resistance
VRL = Aout = Vair value
When the sensor detects gas, the RS value can be calculated after measuring the value of Aout.
The VRL value at this time is the Aout value after gas is detected. It is different from the value of the above formula. The VCC value and the RL value
are the same as above.
The R0 and RS values are obtained, and the specific concentration value of the gas is converted by the RS / R0 value of the Sensitivity Characteristic
Curve.