Infinite L-com SRAQ-G012 Manuale utente

CARBON MONOXIDE (CO) SENSOR MODULE

User Guide for SRAQ-G012

Thank you for choosing L-com product. To ensure safe, accurate performance and product longevity, please take a moment to familiarize yourself

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

product, please call us at 800.341.5266.

Reach out to us at customerservice@l-com.com and visit our website at www.l-com.com

M_L-com_SRAQ-G012_11/2022_R1.0

Product Description

The SRAQ-G012 gas sensor module detects the presence and concentration of carbon monoxide gas. Integrated circuitry produces a voltage signal

corresponding to the gas concentration. Having high sensitivity to this dangerous odorless and colorless gas, the sensor module can detect carbon

dioxide concentrations ranging from 10 to 10,000 ppm. The SRAQ-G012 has both analog and level outputs with adjustable output sensitivity.

Features

 Features MQ7 sensing element

 Highly sensitive to carbon monoxide

 Analog and TTL level outputs

 4 pin male header

Applications

 Portable C02 detector

 Power generation

 Storage areas

 General indoor air quality monitoring

 Smart buildings and garages

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 Carbon monoxide

Detection Concentration 10  10000ppm (Carbon monoxide)

Preheating Time >30 mins

Response Time ≤1 sec

Recovery Time ≤30 sec

Output Mode

Aout (Analog signal) Vair~4.8V (non-linear)

Dout (Level signal) Low level: 0V; High level: 3.7V

Work environment

Temperature -10~50 °C

Humidity ＜95% RH

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

MQ7 Probe on internet.

Typical Sensitivity Curve

Temperature: 20 °C

Humidity: 65%

Oxygen: 21%

RL = 20 kΩ

The ordinate is the resistance ratio of the sensor (Rs/Ro), and the abscissa is the gas concentration.

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.

Indice

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