Residential CO Safety Monitoring: Widely used in home CO detectors to monitor carbon monoxide leaks from gas stoves, water heaters, fireplaces, or faulty heating systems, protecting families from CO poisoning.
Portable Personal Protection: Integrated into small, portable gas detectors for personal use—such as by maintenance workers, gas station staff, or indoor air quality inspectors—to detect CO in real time during on-site operations.
Industrial Low-Concentration Detection: Applied in light industrial scenarios (e.g., small workshops, storage rooms with fuel-burning equipment) to monitor low CO concentrations (typically 20–1000 ppm) and trigger early warnings for minor leaks.
Automotive Auxiliary Detection: Used in some vehicle-related systems (e.g., garage air quality monitors) to detect CO buildup from idling cars, preventing risks in enclosed or semi-enclosed parking spaces.

2. Features:

Cost-Effective & Easy to Use: Low manufacturing cost compared to high-end industrial sensors; simple pin configuration (power, ground, signal) allows easy integration into Arduino, Raspberry Pi, or basic electronic circuits.
Targeted Sensitivity to CO: Optimized for detecting carbon monoxide, with high sensitivity to low CO concentrations (20–1000 ppm, adjustable for higher ranges); minimal response to common interfering gases like methane or propane (with proper calibration).
Wide Operating Voltage Range: Typically works with 5V DC power supply, compatible with most low-voltage electronic platforms, making it suitable for DIY projects or consumer electronics.
Rapid Warm-Up & Response: Requires a short warm-up time (usually 2–5 minutes) to stabilize; T90 response time is generally < 10 seconds for CO concentration changes, enabling quick risk alerts.
Compact & Lightweight Design: Small size (often Φ20mm × 18mm) and low weight, easy to install in compact devices like handheld detectors or wall-mounted home alarms.
Cost-Effective Maintenance: No need for frequent replacement of consumables; supports periodic calibration (via simple circuit adjustments) to maintain measurement accuracy over time.

Parameter	Symbol	Value	Remarks
Circuit Voltage	VC	5 V ± 0.1 V (AC or DC)
Heating Voltage (High)	VH(H)	5 V ± 0.1 V (AC or DC)
Heating Voltage (Low)	VH(L)	1.4 V ± 0.1 V (AC or DC)
Load Resistance	RL	Adjustable
Heating Resistance	RH	33 Ω ± 5% (at room temperature)
Heating Time (High)	TH(H)	60 ± 1 s
Heating Time (Low)	TH(L)	90 ± 1 s
Heating Consumption	PH	About 350 mW
Operating Temperature Range	Tao	-20 °C - 50 °C
Storage Temperature Range	Tas	-20 °C - 50 °C	It is recommended to store at 0 °C - 20 °C
Operating Humidity Range	RH	< 95% rh	Non - condensing
Oxygen Concentration	O2	21% (standard condition)	The minimum value is over 2%, and oxygen concentration can affect sensitivity
Detecting Range		20 ppm - 2000 ppm (Carbon Monoxide)	Some sources also mention 10 - 10000 ppm
Sensitive Resistance	RS	2 k - 20 k (in 100 ppm CO)
Sensitivity		≥3%
Response Time		≤1 s
Recovery Time		≤30 s
Size		35x20x11 mm (or other dimensions in different sources)

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