Gas & Air

MQ-4 Gas Sensor Specifications

Sensor Type Semiconductor
Power requirements: VCC – 5V±0.1
DO output: TTL digital 0 and 1 (0.1 and 5V)
AO output: 0.1-0 .3 V (relative to pollution), the maximum concentration of a voltage of about 4V
Detection Gas: Natural gas/Methane
Detection Concentration: 200-10000ppm (Natural gas / Methane)
Interface: 1 TTL compatible input (HSW), 1 TTL compatible output (ALR)
Heater consumption: less than 750mw
Operating temperature: 14 to 122 °F (-10 to 50°C)
RH Related humidity less than 95%Rh
O2 Oxygen concentration is 21% (standard condition) – Oxygen concentration can affect sensitivity
Load resistance: 20KO
Sensing Resistance Rs: 10KO- 60KO (1000ppm CH4)

Power: 2.5V ~ 5.0V
Dimension: 40.0mm * 21.0mm
Mounting holes size: 2.0mm

Model: MQ-8 Hydrogen Gas Sensor Module
Brand Name: HAILANGNIAO

Module features:
It has good sensitivity to the detection of hydrogen.
input voltage: DC5V power consumption (current): 150mA
DO output: TTL digits 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3V (relatively pollution-free), the maximum concentration voltage is about 4V
Using high quality double panel design, it has power indication and TTL signal output indication.
It has DO switching signal (TTL) output and AO analog signal output.
the TTL output effective signal is low level. (when the output is low, the signal lights on, can be directly connected to a single chip or a relay module).
To simulate the output voltage, the higher the concentration, the higher the voltage.
four screw holes are easy to locate;
The shape of the product: 32 (L) *20 (W) *22 (H)
Long term life and reliable stability

Model: MQ-9 Gas Sensor (CO, LPG,CH4) Module

Module Features :
Good sensitivity to CO/Combustible gas * High High sensitivity to Methane, Propane and CO
Input voltage : DC5V Power consumption ( current ): 150mA
DO output : TTL digital 0 and 1 ( 0.1 and 5V)
AO output :0.1-0 .3 V ( relative to pollution ) , the maximum concentration of a voltage of about 4V
Using high-quality dual-panel design, with power indicator and TTL signal output instructions;
The switching signal having a DO (TTL) output and analog output AO ;
TTL output valid signal is low . ( Low-level signal when the output light can be directly connected to the microcontroller or relay module )
The higher the voltage of the analog output voltage with concentration higher .
Product dimensions : 32 (L) * 20 (W) * 22 (H)
Has a long life and reliable stability
Rapid response and recovery characteristics
Special note: After the sensor is powered , needs to warm up around 20S