Product Details
                                        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 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) |  | 
 
                
                    Company Profile
                                        Yijiajie Electronics is a full range of silicon pressure sensors
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