Gas Sensor
Gas sensors, also known as gas detectors or gas leak detectors, are critical electronic components used to detect toxic, combustible, or hazardous gases and measure gas concentrations in various environments. These sensors are essential for safety, air quality monitoring, and industrial automation.
Our collection includes a broad range of high-performance gas sensors, including the popular MQ series:
- MQ-2 – Methane, Butane, LPG, Smoke
- MQ-3 – Alcohol, Ethanol, Smoke
- MQ-4 – Methane, CNG Gas
- MQ-5 – Natural Gas, LPG
- MQ-6 – LPG, Butane
- MQ-7 – Carbon Monoxide
- MQ-8 – Hydrogen Gas
- MQ-9 – Carbon Monoxide, Flammable Gases
- MQ131 – Ozone
- MQ135 – Air Quality (CO, Ammonia, Benzene, Alcohol, Smoke)
- MQ136 – Hydrogen Sulfide
- MQ137 – Ammonia
- MQ138 – Benzene, Alcohol, Propane, Formaldehyde, Hydrogen
- MQ214 – Methane, Natural Gas
We feature gas sensors from top global brands, including:
DFROBOT, WINSEN, ASAIR, ACEBOTT, SHARP MICROELECTRONICS, AOSONG, SHARP, RENESAS, PLANTOWER, SENSIRION, INFINEON, MEMSFRONTIER, MASTECH, SEEED STUDIO, FIGARO, MIKROE, PIMORONI, ADAFRUIT, and WAVESHARE.
Whether you’re working on prototyping, air purification systems, or smart industrial controls, our gas sensors offer precision, durability, and peace of mind.
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MH-Z19 infrared CO2 sensor for CO2 monitor with pin
Olimex
$38.50Features: CATEGORY SPECIFICATIONS Product Type Carbon Dioxide (CO₂) Gas Sensor Model MH-Z19B Detection Principle Non-Dispersive Infrared (NDIR) Gas Detected Carbon Dioxide (CO₂) Measurement Range 0 – 10,000 ppm (selectable...- SKU:
- PEWMZ16
$38.50 -
MP135 Air Pollution Level Meter Gas Sensor
Dikavs
$3.47MP135 is generally preferred to measure the amount of gases such as ammonia and nitrogen in the environment. Thanks to the Al2O3 (Aluminum oxide) technology, MP135 has made the reaction time very fast. In addition, it can make high-precision...- SKU:
- PEDAD58
$3.47 -
MQ-214 Methane Sensor Combustible Gas Sensor
Dikavs
$3.47MQ - 214 is a Methane (CH4) gas sensor detects the concentrations of methane in the air and outputs its reading as an analog voltage. Wide detecting scope. Fast response and High sensitivity. Stable and long life. Simple drive circuit. They are used in...- SKU:
- PEDAD57
$3.47 -
MQ137 Ammonia Gas Sensor
Dikavs
$13.86Sensitive material of MQ137 gas sensor is SnO2, which with lower conductivity in clean air. When NH3 gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to...- SKU:
- PEDAD56
$13.86 -
MQ-136 Hydrogen Sulfide Gas Detection Sensor
Dikavs
$13.86Sensitive material of MQ136 gas sensor is SnO2, which with lower conductivity in clean air. When H2S gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to...- SKU:
- PEDAD55
$13.86 -
MQ131 Ozone Gas Sensor High Concentration 10~1000ppm
Dikavs
$11.55Ozone sensors are specifically designed to detect ground-level ozone, a harmful pollutant that can irritate the respiratory system. The MQ131 gas sensor employs a semiconductor metallic oxide as its sensitive material, which exhibits high conductivity in...- SKU:
- PEDAD54
$11.55 -
MQ-8 Hydrogen Gas Sensor
Dikavs
$1.93MQ-8 Working voltage: 5V DC Features: Microprocessor compatible TTL output. Analogue output. The output voltage changes proportionally to the gas concentration in the air. High precision. It accurately measures the concentration of Hydrogen Gas...- SKU:
- PEDAD53
$1.93 -
MQ-2 LPG, Propane and Hydrogen Measuring Sensor
Dikavs
$1.93MQ-2 Working voltage: 5V DC Features: Microprocessor compatible TTL output. Analogue output. The output voltage changes proportionally to the gas concentration in the air. High precision. It accurately measures the concentration of LPG, Propane (C3H8)...- SKU:
- PEDAD52
$1.93 -
MQ-135 Air Quality Sensor
Dikavs
$1.93MQ-135 Working voltage: 5V DC Features: Microprocessor compatible TTL output. Analogue output. The output voltage changes proportionally to the gas concentration in the air. High precision. It accurately measures the concentration of sulfur, benzene,...- SKU:
- PEDAD51
$1.93 -
MQ Series Sensors 7 -Pin Universal
Dikavs
$0.77Features: CATEGORY SPECIFICATIONS Product Type Gas Sensor Mounting Base Socket Compatibility MQ2, MQ3, MQ4, MQ5, MQ9/135 gas sensors Pin Count 7 pins Material PC (plastic) + metal contacts Color White Function Provides secure mounting...- SKU:
- PEDAD50
$0.77 -
SGP41 Air 5V Measurement TVOC/eCO2 Formaldehyde Carbon Dioxide Detector Gas Sensor
Olimex
$11.55SGP4 is a VOC (volatile organic compounds) and NOx (nitrogen oxides) sensor designed as a digital intelligent switch and regulating unit that can be applied to air treatment equipment such as purifiers. Thanks to Sensirion's powerful gas index algorithm,...- SKU:
- PECMG53
$11.55 -
ACEBOTT MQ-4 Gas Sensor/Natural Gas Compatible with Arduino
ACEBOTT
$3.85ACEBOTT MQ-4 Gas Sensor/Natural is a combustible gas sensor, which can detect the concentration of combustible gas in the environment. Its working principle is based on the change of electrical properties of semiconductor gas sensitive materials...- SKU:
- QB084
$3.85 -
SCD41 Gas Sensor CO2 Carbon Dioxide Temperature and Humidity
diymore
$30.80The SCD41 Gas Sensor Module is a highly advanced sensor designed to detect CO₂ (carbon dioxide) levels, temperature, and humidity with exceptional accuracy and reliability. Built on Sensirion's industry-leading technology, this module offers extended...- SKU:
- PEUYT44E
$30.80 -
MP-2 MP503 Smoke detection Sensor Module
Olimex
$5.78Features: CATEGORY SPECIFICATIONS Product Type Smoke / Gas Detection Sensor Model MP-2 Working Principle Metal oxide semiconductor (MOS) changes conductivity when gas is present Sensor Structure Multilayer thick film with Al₂O₃ ceramic...- SKU:
- PEMSV94
$5.78 -
MP-4 MP503 Combustible Gas Sensor Module
Olimex
$5.78Features: CATEGORY SPECIFICATIONS Product Type Combustible Gas Sensor Model MP-4 Working Principle Metal Oxide Semiconductor (MOS) changes conductivity based on gas concentration Sensor Structure Multilayer thick film on Al₂O₃ ceramic...- SKU:
- PEMSV92
$5.78 -
MQ-131 ozone gas sensor Module
Olimex
$25.03Features: CATEGORY SPECIFICATIONS Product Type Ozone Gas Sensor Model MQ131 Sensitive Material SnO₂ (Tin Dioxide) Working Principle Conductivity of SnO₂ changes with ozone concentration Detection Method Gas concentration → resistance...- SKU:
- PEOSO82
$25.03 -
TGS822 alcohol gas sensor
Olimex
$14.63Features: CATEGORY SPECIFICATIONS Product Type General Purpose Gas Sensor Model Figaro TGS822 Sensitive Material Tin Oxide (SnO₂) Working Principle Gas exposure changes conductivity of SnO₂, producing corresponding electrical...- SKU:
- PEDDF48
$14.63 -
MQ-137 NH3 Ammonia Gas Sensor
Olimex
$26.95Features: CATEGORY SPECIFICATIONS Product Type Gas Detection Sensor Module Gas Detected Ammonia (NH₃) vapor / gas Detection Range 10 – 300 ppm Sensor Type Electrochemical / gas sensing probe (NH₃ sensitive element) Main IC LM393...- SKU:
- PESLF99
$26.95 -
MQ-136 Hydrogen Sulfide Gas Sensor
Olimex
$26.95Features: CATEGORY SPECIFICATIONS Product Type Multi-Gas Detection Sensor Module Model ZYMQ-135 (MQ-135 based module) Main IC LM393 comparator Sensor Type Semiconductor gas sensor Operating Voltage 5V DC Dimensions 32 × 22 ×...- SKU:
- PESLF98
$26.95 -
MP-135 MP503 air quality detection gas sensor
Olimex
$5.78MP135 gas sensor is for air quality. It adopts multilayer thick film manufacturing technology. The heater and metal oxide semiconductor material on the ceramic substrate of subminiature Al2O3 are fetched out by electrode down-lead, encapsulated in metal...- SKU:
- PEDDF49
$5.78 -
SOLD OUT
MH-Z14A CO2 Carbon Dioxide Sensor
Olimex
$30.80Features: CATEGORY SPECIFICATIONS Product Type Intelligent CO₂ Gas Sensor Module Model MH-Z14A Sensor Type NDIR (Non-Dispersive Infrared) CO₂ sensor Detection Gas Carbon Dioxide (CO₂) Detection Range 0 – 5000...- SKU:
- PEDER48
$30.80 -
MQ Series Sensors 6 -Pin Universal
Dikavs
$0.62Features: CATEGORY SPECIFICATIONS Product Type Gas Sensor Mounting Base Socket Compatibility MG811, MQ2, MQ3, MQ4, MQ5, MQ6, MQ9 gas sensors Pin Count 6 pins Material PC (plastic) + metal contacts Color White Function Provides secure...- SKU:
- PEDAD49
$0.62 -
MS-1100 Formaldehyde Benzene Gas Sensor
Olimex
$11.55Features: CATEGORY SPECIFICATIONS Product Type Air Quality / Volatile Organic Compound (VOC) Gas Sensor Detection Type Semiconductor gas sensor (analog + digital output) Heating Voltage 5V ±2% Working Current ≤ 100 mA...- SKU:
- PEGPS25
$11.55 -
ZE08-CH2O Formaldehyde sensor
Olimex
$23.10Features: CATEGORY SPECIFICATIONS Product Type Air Quality / Gas Sensor Module Detection Type Semiconductor-based air quality sensing Output Types UART, PWM, Analog voltage (DAC) Analog Output Range 0.4 – 2.0 V (standard DAC...- SKU:
- PEFSS62
$23.10 -
F08406 MG811 CO2 Carbon Dioxide Sensor
Olimex
$38.50Features: CATEGORY SPECIFICATIONS Product Type Carbon Dioxide (CO₂) Gas Sensor Module Model MG-811 Sensor Type Metal Oxide / electrochemical CO₂ sensing module Detection Gas Carbon Dioxide (CO₂) Operating Principle Measures CO₂...- SKU:
- PEFOR25
$38.50 -
MH-Z19 infrared CO2 sensor for CO2 monitor
Olimex
$38.50Features: CATEGORY SPECIFICATIONS Product Type Carbon Dioxide (CO₂) Gas Sensor Model MH-Z19B Detection Principle Non-Dispersive Infrared (NDIR) Gas Detected Carbon Dioxide (CO₂) Measurement Range 0 – 10,000 ppm (selectable...- SKU:
- PEWMZ15
$38.50 -
MQ-4 Methane Gas Sensor
Olimex
$2.31Features: CATEGORY SPECIFICATIONS Product Type Combustible Gas Sensor Module Model / Sensor Type MQ-4 (SnO₂ gas sensing element) Detection Gases Methane (CH₄), Natural gas, LPG, Propane Detection Range 300 – 10,000 ppm Operating...- SKU:
- PELPG12
$2.31 -
MQ-131 ozone gas sensor
Olimex
$24.64Features: CATEGORY SPECIFICATIONS Product Type Ozone Gas Sensor Model MQ131 Sensitive Material Tin Oxide (SnO₂) Working Principle Gas concentration changes conductivity of SnO₂, converted to electrical signal Detection Method Conductivity...- SKU:
- PEOSO88
$24.64 -
MQ-6 Combustible Gas Sensor
Olimex
$2.31Features : CATEGORY SPECIFICATIONS Product Type Combustible Gas Sensor Module Model MQ-6 Sensitive Material Tin Oxide (SnO₂) Working Principle Gas concentration increases conductivity of SnO₂, converted to electrical signal Detection...- SKU:
- PELPG62
$2.31 -
MQ-8 Hydrogen Gas Sensor
Olimex
$2.31Features : CATEGORY SPECIFICATIONS Product Type Hydrogen (H₂) Gas Sensor Module Model / Sensor Type MQ-8 (SnO₂ gas sensing element) Detection Gas Hydrogen (H₂), hydrogen-containing gases Detection Range 100 – 1000...- SKU:
- PESLF95
$2.31 -
MQ-2 Gas LPG Sensor
Olimex
$2.31Features: CATEGORY SPECIFICATIONS Product Type Combustible Gas & Smoke Sensor Module Model / Sensor Type MQ-2 (ZYMQ-2 sensing element) Detection Gases LPG, Propane, Methane, Hydrogen, Smoke Operating Principle Tin dioxide (SnO₂)...- SKU:
- PESGL52
$2.31 -
MQ-3 Alcohol Ethanol Sensor
Olimex
$2.31Features: CATEGORY SPECIFICATIONS Product Type Alcohol / Ethanol Gas Sensor Module Model / Sensor Type MQ-3 (ZYMQ-3 sensing element) Detection Gas Ethanol (Alcohol vapor) Operating Principle Tin dioxide (SnO₂) conductivity increases with...- SKU:
- PEMQD23
$2.31 -
MQ-5 LPG, natural gas, coal gas Sensor
Olimex
$2.31Features : CATEGORY SPECIFICATIONS Product Type Combustible Gas Sensor Module Model / Sensor Type MQ-5 (SnO₂ gas sensing element) Detection Gases LPG, Methane (CH₄), Propane, Coal gas, Natural gas Detection Principle Tin dioxide (SnO₂)...- SKU:
- PEMNS45
$2.31 -
MQ-9 Liquefied Methane Gas Sensor
Olimex
$3.08Features: CATEGORY SPECIFICATIONS Product Type Carbon Monoxide (CO) & Combustible Gas Sensor Module Model / Sensor Type MQ-9 (SnO₂ gas sensing element) Detection Gases Carbon Monoxide (CO), Methane (CH₄), LPG, Propane Detection Range...- SKU:
- PESLF45
$3.08 -
MQ-7 Carbon Monoxide Gas Sensor
Olimex
$3.08Features: CATEGORY SPECIFICATIONS Product Type Carbon Monoxide (CO) Gas Sensor Module Sensor Type MQ-9 (SnO₂ semiconductor gas sensor) Target Gas Carbon Monoxide (CO) Detection Range 10 – 1000 ppm CO Operating Principle Change in...- SKU:
- PECMG52
$3.08