Gas Sensors

Part Number	Description / PDF	Quantity
SGX-4H2S Amphenol	4 SERIES H2S SENSOR - 100PPM	93
VQ31MB Amphenol	PELLISTOR PR 3.5V/90MA TC C CAN	14
VQ641TS/1 Amphenol	VQ41 PELLISTOR VQ600 HEAD, METRI	23
VQ635M/1 Amphenol	VQ35 PELLISTOR VQ600 HEAD, METRI	0
IR12GJ Amphenol	19MM, HYDROCARBON INFRARED GAS S	10
VQ21TB Amphenol	PR PELLISTOR PR, 2V/300MA OC SOL	180
VQ631M/3 Amphenol	VQ31 PELLISTOR, VQ600 HEAD, 0.75	0
VQ635M/2 Amphenol	VQ35 PELLISTOR, VQ600 HEAD, 0.5"	0
VQ601/3 Amphenol	VQ1 PELLISTOR, VQ600 HEAD, 0.75"	0
IR11GM_1 Amphenol	16MM,0-5% VOLUME CO2 INFRARED GA	4
VQ631M/2 Amphenol	VQ31 PELLISTOR, VQ600 HEAD, 0.5"	0
VQ606M/3 Amphenol	VQ6 PELLISTOR, VQ600 HEAD, 0.75"	0
VQ547TS Amphenol	VQ47 AMMONIA SENSOR, VQ500 HEAD	45
EC4-20-SO2 Amphenol	4 SERIES SO2 GAS SENSOR 20PPM	11
VQ621T/2 Amphenol	VQ21 PELLISTOR, VQ600 HEAD, 0.5"	0
INIR-RF-R290 Amphenol	INTEGRATED GAS SENSOR -R290	25
VQ546MR Amphenol	VQ46 PELLISTOR, VQ500 HEAD, +VE	34
IR11EM Amphenol	16MM, 0-5% VOLUME CO2 INFRARED G	23
VQ621T/1 Amphenol	VQ21 PELLISTOR VQ600 HEAD, METRI	21
VQ641TS/3 Amphenol	VQ41 PELLISTOR, VQ600 HEAD, 0.75	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