Gas Sensors

Part Number	Description / PDF	Quantity
T5440 Comet America	CO2 TRANSMITTER WITH RS485	20
VQ6MB Amphenol	PELLISTOR 2V, TC, CLOSED CAN COM	0
ZMOD4410AI3V Renesas Electronics America	TVOC SENSOR FOR WATER-RESISTANT	0
110-406 Spec Sensors	SENSOR GAS O3 THRU HOLE	1160
USEQGCCAS82100 KEMET	GAS DETECTOR, ANALOG TO-39, GAS	7
IR11EJ Amphenol	19MM, 0-5% VOLUME CO2 INFRARED G	27
USEQGCCAC8N100 KEMET	GAS DETECTOR, ANALOG TO-39, GAS	8
VQ625/2 Amphenol	VQ25 PELLISTOR, VQ600 HEAD, 0.5"	0
T6615-F Thermometrics (Amphenol Advanced Sensors)	CO2 MODULE 2000PPM FLOW THROUGH	10
968-038 Spec Sensors	DGS-SO2 DIGITAL GAS SENSOR MODUL	68
USEQGCQAEXH100 KEMET	GAS DETECTOR, ANALOG TO-39, GAS	5
H5424 Comet America	CO2 REGULATOR WITH RS485 OUTPUT	20
IR11BR Amphenol	19MM, 100% VOLUME CO2 INFRARED G	21
VQ625/1 Amphenol	VQ25 PELLISTOR VQ600 HEAD, METRI	0
110-507 Spec Sensors	SENSOR GAS NO2 THRU HOLE	121
SCD40-D-R2 Sensirion	CO2 SENSOR 50 PPM I2C SMD	0
USEQGCDA50L100 KEMET	GAS DETECTOR, ANALOG TO-39, GAS,	10
MF010-0-LC4 Honeywell Sensing and Productivity Solutions	SENSOR OXYGEN 24V 500MA	5
SEN-09403 SparkFun	CARBON MONOXIDE SENSOR - MQ-7	0
USEQGCCAREF100 KEMET	GAS DETECTOR, ANALOG TO-39, GAS	9

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