Gas Sensors

Part Number	Description / PDF	Quantity
IR22EJ Amphenol	SERIES 2, 19MM, 0-5%/100% HC IR	0
IR603/2 Amphenol	IR SENSOR HEAD FOR 0-5%/100% BRO	0
ESCO2D2AM Carlo Gavazzi	SEN CO2 2000PPM 4-20MA OUT W/COM	0
CCS801B-COPD500 ams	CCS801B-COPD500 DFN4 LF T&R	0
MNS2-9-W2-GS-C1 Monnit	ALTA (CO) GAS SENSOR AA BATTERY	0
FIT0227 DFRobot	CARBON MONOXIDE SENSOR (MQ7)	0
ESCO2W5A Carlo Gavazzi	SEN CO2 5000PPM 4-20MA OUT	0
CGESC02W2S Carlo Gavazzi	SEN CO2 SWITCHING OUT 2000PPM	0
STC31-R5 Sensirion	CO2 THERMAL CONDUCTIVITY SENSOR	0
SGX-4CO Amphenol	4 SERIES CO SENSOR 2,000PPM	96
ESCOD3AM Carlo Gavazzi	SEN CO 300PPM 4-20A OUT W/COMM	0
SEN-17052 SparkFun	HYDROGEN SULFIDE GAS SENSOR - MQ	30
IR22GJ Amphenol	SERIES 2 , 19MM, 0-5%/100% HC IR	0
ESCO2W2V Carlo Gavazzi	SEN CO2 2000PPM 0-10V OUT	0
INIR-ME5% Amphenol	METHANE GAS SENSOR 0-5%	0
ESCO2D5AM Carlo Gavazzi	SEN CO2 5000PPM 4-20MA OUT W/COM	0
IR602/3 Amphenol	IR SENSOR HEAD FOR 0-5%/100% HC	0
SEN-17050 SparkFun	DUAL GAS CO AND CH4 DETECTION SE	28
IR21BD Amphenol	EX-IA CO2 INFRARED GAS SENSOR	24
ESCO2D2V Carlo Gavazzi	SEN CO2 2000PPM 0-10V OUT	0

Gas Sensors

1. Overview

Gas sensors are detection devices that identify and measure gas concentrations in the environment. They convert chemical interactions with gas molecules into electrical signals for quantitative analysis. These sensors play a critical role in industrial safety, environmental monitoring, healthcare, and smart home systems by preventing gas leaks, ensuring air quality, and enabling process control.

2. Major Types and Functional Classification

Type	Functional Features	Application Examples
Electrochemical	High accuracy, stable baseline, requires oxygen	CO detectors, O2 monitors
Semiconductor	Low cost, broad detection range, temperature-dependent	Indoor air quality sensors
Catalytic Combustion	Explosive gas detection, requires periodic calibration	Industrial methane detectors
Infrared (IR)	Non-contact measurement, high selectivity	CO2 HVAC monitoring
Photoionization (PID)	VOC detection at ppm levels, UV lamp required	Environmental pollution monitoring

3. Structure and Components

A typical gas sensor consists of: - Sensing element (metal oxide/electrolyte membrane) - Signal conditioning circuit (amplifier, ADC) - Housing with gas inlet ports - Temperature/humidity compensation module - Communication interface (UART/I2C)

4. Key Technical Specifications

Parameter	Description
Detection Range	Measurable gas concentration span (ppm to %LEL)
Sensitivity	Signal change per gas concentration unit (mV/ppm)
Response Time	T90 response speed (3-300 seconds)
Accuracy	Measurement error margin ( 2-10%)
Operating Temperature	Functional range (-20 C to +50 C typical)
Long-term Stability	Drift specification (5-15% per year)

5. Application Fields

Industrial safety: Fixed gas detection systems
Environmental monitoring: Urban air quality stations
Healthcare: Medical breath analyzers
Smart homes: Combustible gas alarms
Automotive: Cabin air quality management

6. Leading Manufacturers and Products

Manufacturer	Product Series	Key Features
Honeywell	XNX Universal Transmitter	Dual-sensor redundancy
Figaro Engineering	TGS2600	Low-power VOC detection
Membrapor	Toxic Gas Sensors	Eletrochemical cells for Cl2
Senseair	K-30 CO2 Module	NDIR technology, 30ppm accuracy
AMS (Austria)	ENS160 MOX Sensor	AI-based gas discrimination

7. Selection Guidelines

Key consideration factors:

Target gas chemical properties
Environmental conditions (temperature/humidity range)
Required detection threshold and repeatability
Power consumption budget
Maintenance accessibility for calibration
Cost vs. lifetime trade-offs

Industry Trends Analysis

Emerging development trends include: - Miniaturization through MEMS technology - Multi-gas detection using AI pattern recognition - Wireless self-powered IoT sensor nodes - Enhanced selectivity via nanomaterial coatings - Reduced cross-sensitivity through hybrid sensing methods