Gas Sensor

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CO Sensor Module, 0-500ppm, UART Output

● Electrochemical CO sensor module, 0-500ppm detection ● 0.1ppm resolution captures low carbon monoxide levels ● UART/DAC voltage output supports smart device integration ● 5V-12V compact module suits alarms and air quality systems

$67.12

Picture of Hydrogen Sulfide (H2S) Gas Sensor, 0-50ppm~5000ppm

Hydrogen Sulfide (H2S) Gas Sensor, 0-50ppm~5000ppm

● Detect: Hydrogen sulfide sensor ● Rang: 0-50ppm~5000ppm ● Electrochemical three-electrode ● Resolution: 0.1 ppm

$141.62

Picture of Ultrasonic Oxygen Sensor, 21-95.6%, Long/Short Type

Ultrasonic Oxygen Sensor, 21-95.6%, Long/Short Type

● Detect: Oxygen (O2) ● Concentration: 21-95.6% ● Flow: 0 to 10 L/min ● Long/short type optional

$48.99

Picture of Formaldehyde (CH2O) Gas Sensor, RS485/TTL

Formaldehyde (CH2O) Gas Sensor, RS485/TTL

● Detect: Formaldehyde (CH2O) ● Rang: 0-10ppm ● Interface: RS485, TTL ● Resolution: 0.1 ppm

$165.71

IR CO2 Transmitter with Display, 0-2000/5000/10000ppm

● CO2 transmitter for greenhouse and air quality monitoring ● 0-2000ppm / 5000ppm / 10000ppm selectable ranges ● RS485 output for HVAC, PLC and smart control systems ● IP65 housing with display screen and 1ppm resolution

$146.32

Oxygen Gas Transmitter with Display, 0-30%Vol/0-25%Vol

● Oxygen gas transmitter with OLED display ● 0-25%Vol / 0-30%Vol range for O2 monitoring ● RS485, 4-20mA, 0-5V and 0-10V outputs ● Fast detection in warehouses, farms and food storage

$117.58

Picture of Smart Carbon Monoxide Sensor, 0-999ppm

Smart Carbon Monoxide Sensor, 0-999ppm

● Smart carbon monoxide sensor, 0-999ppm ● 51ppm CO alarm with sound and light warning ● CO, temperature and humidity real-time display ● Optional combustible gas detection for added safety

$70.29

Ammonian (NH3) Gas Sensor with Module, 0-100ppm~1000ppm

● Detect: Ammonian (NH3) ● Rang: 0-100ppm~1000ppm ● Interface: RS485, TTL, 4-20mA ● Resolution: 1 ppm

$269.68

Picture of Infrared CO2 Sensor, 0-5000ppm, TTL/RS485

Infrared CO2 Sensor, 0-5000ppm, TTL/RS485

● Reliable NDIR CO2 sensing for cleaner indoor air ● 0-5000ppm CO2 detection with high stability ● UART/RS485/TTL output for system integration ● IP54 design with temperature compensation

$328.68

Picture of Mini Oxygen Sensor, 0-30%, 3 Electrode

Mini Oxygen Sensor, 0-30%, 3 Electrode

● Mini oxygen sensor with 0–30% O2 linear output ● 3-electrode electrochemical design for stable detection ● T90 ≤15s fast response to oxygen level changes ● 1g compact PPO housing for portable gas detectors

$158.93

Picture of Wireless Carbon Monoxide Sensor, 0-1000ppm

Wireless Carbon Monoxide Sensor, 0-1000ppm

● Wireless CO sensor with 0–1000ppm detection range ● 50ppm alarm threshold with sound and light alerts ● 1000mAh rechargeable battery and Type-C charging ● Portable carbon monoxide monitor for home, garage and camping

$89.59

CO Detection Sensor, 0-300ppm, RS485/0-10V

● 0-300ppm carbon monoxide detection ● Electrochemical CO sensing with 1ppm resolution ● RS485, 0-10VDC and relay output ● Fast <30s response for ventilation control

$315.29

CO2 Sensor Probe, 0-10000ppm

● 0-10000ppm CO2 sensor probe for air monitoring ● 5V heating voltage with low power operation ● Metal shell design for stable signal output ● Used in greenhouses, fermentation and ventilation systems

$65.29

Phosphine (PH3) Gas Sensor, RS485/TTL Module Output

● Detect: Phosphine (PH3) ● Rang: 0-20ppm ● Interface: RS485, TTL ● Resolution: 0.1 ppm

$198.99

Picture of Trace Oxygen Sensor, 0-10ppm to 0-10000ppm

Trace Oxygen Sensor, 0-10ppm to 0-10000ppm

● PPM oxygen sensor for trace O2 gas detection ● 0-10ppm to 0-10000ppm range with high accuracy ● Fast T90<7s response, drift below 1% per month ● Durable HDPE housing suits oxygen analyzers and gas detectors

$277.06

Picture of Lead Free Oxyge Sensor with Temperature Compensation

Lead Free Oxyge Sensor with Temperature Compensation

● Lead-free oxygen sensor with electrochemical O2 detection ● 0–100% linear output for accurate oxygen monitoring ● Fast response and humidity-resistant sensing performance ● Molex 3-pin connector for medical and analyzer devices

$95.73

Picture of PID Gas Sensor for Benzene (C6H6), 0-10000ppm

PID Gas Sensor for Benzene (C6H6), 0-10000ppm

● Detect gas: Benzene (C6H6) ● Rang: 0-10000ppm ● Photoionization Detection ● Resolution: 1ppb~2ppm

$667.59

Thermal Conductivity CO2 Sensor, 0-100%Vol

● Thermal conductivity CO2 sensor for industrial monitoring ● 0-100%Vol detection range for industrial CO2 measurement ● Explosion-proof metal housing for harsh environments ● Low-power 3.0V design for greenhouse and fermentation control

$102.21

Picture of CO2 Concentration Sensor, 0-10000ppm

CO2 Concentration Sensor, 0-10000ppm

● 0-10000ppm CO2 sensor for air quality monitoring ● Stable EMF output for continuous CO2 detection ● High sensitivity with strong CO2 selectivity ● Suitable for greenhouses, schools and fermentation systems

$86.97

Picture of Medical Oxygen Sensor, 0-100%, Molex 3 Pin/Headphone Jack

Medical Oxygen Sensor, 0-100%, Molex 3 Pin/Headphone Jack

● Medical oxygen sensor with 0–100% linear O₂ output ● Shunt electrochemical design delivers stable detection ● T90<15s response tracks oxygen concentration quickl ● 3.5mm TRS, Molex 3-pin and P/N 5520257-2 optional

$99.41

Gas sensor is a monitoring device used to detect gas concentration in air and provide early warning when harmful, combustible, or oxygen-related gases reach unsafe levels. It is suitable for factories, laboratories, warehouses, HVAC systems, environmental monitoring, confined spaces, and industrial safety applications. Gas sensors help users identify gas leaks, poor air quality, oxygen deficiency, and potential explosion or poisoning risks before accidents happen, supporting safer operation, faster response, and better workplace protection.

Choose by Application

For garages, boiler rooms, and parking areas.
Recommended:
CO Sensor

For labs, confined spaces, and industrial processes.
Recommended:
O2 Sensor

For pipelines, workshops, and gas storage areas.
Recommended:
Flammable Gas Sensor

For offices, classrooms, and HVAC ventilation control.
Recommended:
CO2 Sensor

Gas Sensor FAQ

Q1: What is the best gas sensor for industrial safety monitoring?

The best gas sensor depends on the gas type. Choose CO2 sensors for ventilation, CO sensors for carbon monoxide safety, O2 sensors for oxygen monitoring, and combustible gas sensors for leak detection.

Q2: How to choose a gas sensor by gas type?

Confirm the target gas first, such as CO2, CO, O2, CH4, propane, smoke, or combustible gas. Then compare range, output, response time, environment, and installation method.

Q3: What gas sensor is best for CO2 ventilation monitoring?

An NDIR CO2 sensor is commonly used for offices, classrooms, HVAC systems, and indoor ventilation control because it supports stable continuous CO2 measurement.

Q4: What output signal should I choose when buying a gas sensor?

For industrial control, RS485, 4-20mA, 0-5V, 0-10V, UART, and PWM are common. RS485 is suitable for digital systems, while 4-20mA or voltage output is suitable for PLC and analog control.

Products Recommended by Scenario


NDIR Carbon Dioxide (CO2) Sensor	CO Transmitter with OLED Display	Electrochemical O2 Sensor	Flammable Gas Sensor
Suitable for: CO₂ Ventilation Monitoring	Suitable for: CO Gas Safety Detection	Suitable for: O₂ Concentration Monitoring	Suitable for: Combustible Gas Leak Detection
UART (Modbus) 0-2000ppm to 0-5% Vol NDIR technology, fast response	RS485, 4-20mA, 0-5V, 0-10V 0-1000ppm, 0-2000ppm OLED display, electrochemical probe	TTL, RS485 0~25% Vol Dual-electrode design	Combustible gas 0–100%LEL ATEX-certified, sensitivity drift
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Gas Sensor Comparison Table

Type	CO2 Sensor	CO Sensor	O2 Sensor
Advantages	Stable CO₂ monitoring, suitable for ventilation control	Detects toxic carbon monoxide, strong safety warning value	Monitors oxygen deficiency or enrichment, suitable for safety control
Limitations	Mainly used for CO₂ only, not for toxic gas detection	Only detects CO, not combustible gas or oxygen level	Requires proper calibration for accurate oxygen measurement
Cost Level	Medium	Low to Medium	Medium
Output	RS485, UART, PWM, 0-5V, 0-10V	RS485, 4-20mA, 0-5V, 0-10V	RS485, TTL, 4-20mA optional
Typical Applications	Offices, classrooms, HVAC systems, indoor air quality monitoring	Garages, boiler rooms, parking areas, industrial CO safety detection	Labs, confined spaces, medical equipment, industrial monitoring
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