MQ-7B MQ-7 Carbon Monoxide Gas Sensor for Industrial Applications

Model Number:MQ-7B MQ-7
Minimum Order Quantity:1
Delivery Time:3-5work days
Payment Terms:L/C, D/A, D/P, T/T, Western Union, MoneyGram
Place of Origin:CN
Supply Ability:5000pcs
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Location: Shenzhen Guangdong China
Address: Room 3306AB 33rd Floor, SEG Plaza,Huaqiang North Road, Futian District, Shenzhen Guangdong Province 518028
Supplier`s last login times: within 26 hours
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MQ-7B MQ-7 Carbon Monoxide Gas Sensor for Industrial Applications


1. Applications:

  • 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 VoltageVC5 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 ResistanceRLAdjustable
Heating ResistanceRH33 Ω ± 5% (at room temperature)
Heating Time (High)TH​(H)60 ± 1 s
Heating Time (Low)TH​(L)90 ± 1 s
Heating ConsumptionPHAbout 350 mW
Operating Temperature RangeTao-20 °C - 50 °C
Storage Temperature RangeTas-20 °C - 50 °CIt is recommended to store at 0 °C - 20 °C
Operating Humidity RangeRH< 95% rhNon - condensing
Oxygen ConcentrationO2​21% (standard condition)The minimum value is over 2%, and oxygen concentration can affect sensitivity
Detecting Range20 ppm - 2000 ppm (Carbon Monoxide)Some sources also mention 10 - 10000 ppm
Sensitive ResistanceRS2 k - 20 k (in 100 ppm CO)
Sensitivity≥3%
Response Time≤1 s
Recovery Time≤30 s
Size35x20x11 mm (or other dimensions in different sources)


China MQ-7B MQ-7 Carbon Monoxide Gas Sensor for Industrial Applications supplier

MQ-7B MQ-7 Carbon Monoxide Gas Sensor for Industrial Applications

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