Gas Sensors

Image	Part Number	Description / PDF	Quantity	Rfq
	75-194503430659 City Technology	SENSOR IC NO 100 TRANSMITTER	0
	AG706-400 City Technology	SENSOR NO2 7NDH 3 SERIES	0
	TD3K-1A City Technology	TX SO2 T3SF 0-2000PPM SMD O/P	0
	TF3E-1A City Technology	TX NO T3NT 0-50PPM SMD O/P	0
	AD004-104 City Technology	SENSOR 3ST/F(R) 3 SERIES	0
	AD772-400 City Technology	SENSOR SO2 7SH 7 SERIES	0
	TL1F-1A City Technology	TX HCL T3HL 0-100PPM SMD O/P	0
	MHH60-024 City Technology	TRANDUCER CL2 3MCLH 1OMV/PPM	0
	AF706-400 City Technology	SENSOR NO 7BNT 7 SERIES	0
	AAA32-244 City Technology	SENSOR O2 5FO 5 SERIES	0
	75-094133730079 City Technology	SENSOR IC SIH4 50 LT 7 SERIES	0
	AC004-100 City Technology	SENSOR 3H(R) 3 SERIES	0
	TBAO-1AG City Technology	TX CO T3F/F 0-2% SMD O/P GRAY	0
	AJ002-300 City Technology	SENSOR 3HCN(G) 3 SERIES	0
	TB7F-1A City Technology	TX CO T3E/F 0-100PPM SMD O/P	0
	AG004-300 City Technology	SENSOR 3ND(G) 3 SERIES	0
	TE1G-1A City Technology	TX H2 T3HYT 0-200PPM SMD O/P	0
	AB006-309 City Technology	SENSOR 3XF(G) STANDARD	0
	AF006-706 City Technology	SENSOR 3NF/F(R) 3 SERIES	0
	75-173193130659 City Technology	SENSOR IC COCL2 1 SYS. TRANSM	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