Gas Sensors

Part Number	Description / PDF	Quantity
VQ622T/2 Amphenol	VQ22 PELLISTOR, VQ600 HEAD, 0.5"	0
EC4-2000-SO2 Amphenol	4 SERIES SO2 GAS SENSOR 2000PPM	15
IR15TT-R Amphenol	0-100% CH4 & CO2 IR GAS SENSOR F	7
VQ621TS/3 Amphenol	VQ21 PELLISTOR, VQ600 HEAD, 0.75	0
VQ621T/3 Amphenol	VQ21 PELLISTOR, VQ600 HEAD, 0.75	25
VQ601/1 Amphenol	VQ1 PELLISTOR, VQ600 HEAD, METRI	0
EC410 Amphenol	OXYGEN SENSOR	0
VQ622T/3 Amphenol	VQ22 PELLISTOR, VQ600 HEAD, 0.75	25
VQ548ZD-S Amphenol	3.0V - VQ548ZD - ZERO TESTED	31
VQ603/2 Amphenol	VQ3 PELLISTOR, VQ600 HEAD, 0.5"	0
VQ622T/1 Amphenol	VQ22 PELLISTOR VQ600 HEAD, METRI	23
VQ601/2 Amphenol	VQ1 PELLISTOR, VQ600 HEAD, 0.5"	0
IR12EJ Amphenol	19MM, HYDROCARBON INFRARED GAS S	4
SGX-4OX Amphenol	4 SERIES OXYGEN SENSOR 0-25% 2 Y	125
VQ549ZD Amphenol	4.25V -VQ49 PELLISTOR IN A VQ500	37
VQ605M/1 Amphenol	VQ5 PELLISTOR, VQ600 HEAD, METRI	0
MP7217DA Amphenol	MINI LOW POWER FLAMMABLE GAS SEN	21
VQ603/1 Amphenol	VQ3 PELLISTOR, VQ600 HEAD, METRI	0
IR11GJ Amphenol	19MM, 0-5% VOLUME CO2 INFRARED G	7
VQ22TB Amphenol	PR PELLISTOR PAIR 2V/175MA OC SO	25

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