Infinite L-COM SRAQ-G014 User manual

FLAMMABLE GAS SENSOR MODULE
User Guide for SRAQ-G014
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M_L-com_SRAQ-G014_11/2022_R1.0
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Product Description
The SRAQ-G014 gas sensor module detects the presence and concentration of flammable gases such as butane, propane, methane and hydrogen.
Integrated circuitry produces a non-linear voltage signal corresponding to the gas concentrations. The SRAQ-G014 has high sensitivity and can detect
flammable gas concentration in the range of 50 to 10000 ppm and also carbon dioxide from as little as 10 ppm to as much as 1000 ppm.
Features
 Features MQ9 sensing element
 Highly sensitive to CO, CH4, LNG
 Analog and TTL level outputs
 Indication light
 4 pin male header
Applications
 HVAC gas leakage alarm
 Industrial combustible gas alarm
 Portable flammable gas detector
 Integration into air quality monitoring devices

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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 Flammable Gas, CO
Detection Concentration 50  10000 ppm (Flammable gas), 10  1000 ppm (CO)
Preheating Time >30 mins
Response Time ≤1 sec
Recovery Time ≤30 sec
Output Mode
Aout (Analog signal) 0  5 V (non-linear)
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
MQ9 Probe on internet.
Typical Sensitivity Curve
Temperature: 20 °C
Humidity: 65%
Oxygen: 21%
RL = 10 kΩ
Rs: Resistance in various concentration value of gas
R0: Resistance in 1000 ppm LPG
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.