Professional Protection, Safety First—Nexisense MQ-K5 Semiconductor Gas Sensor Certified by New National Standard

Gas safety concerns every household. Undetected leaks can have catastrophic consequences. With the continuous expansion of urban gas networks and the widespread use of commercial kitchens and industrial boilers, higher reliability and anti-false-alarm capabilities are required for gas alarms. Since 2020, the mandatory implementation of GB15322.2-2019 "Gas Detectors Part 2: Semiconductor Sensors for Household and Similar Applications" has set a new industry benchmark.

The Nexisense MQ-K5 is a representative product developed to meet this upgraded standard. It fully passes all test clauses of the new national standard and demonstrates outstanding anti-silicon poisoning performance, long-term stability, and interference resistance, providing reliable core sensing components for gas alarm manufacturers, smart home brands, and industrial safety system integrators. This article comprehensively analyzes the MQ-K5 from regulatory background, technical advantages, real-world performance, to application value, showing why it is a trusted choice in gas safety.

Why Compliance Is No Longer Optional in the New National Standard Era

The old standard had relatively lenient interference tests. Many products were prone to false alarms or permanent sensitivity reduction in common environments with kitchen fumes, alcohol vapors, silicone adhesives, or detergents. The new standard significantly raises critical metrics:

• Anti-silicon poisoning capability (must pass rigorous tests specified by CJ/T 347-2010)

• Long-term stability (performance degradation limits after 5000 hours of high-temperature, high-humidity aging)

• Cross-response limits for ethanol, cooking fumes, and other interfering gases

• Stricter requirements for response and recovery times

Sensors not certified by the new standard may perform well initially but can become "poisoned" by silicon compounds after several months, rendering alarms ineffective. Choosing a sensor certified by the new standard is a fundamental respect for users' safety.

From the project's inception, the MQ-K5 was designed based on the new standard. After hundreds of iterations in material formulations and processes, it achieved full compliance, becoming one of the few semiconductor gas sensors capable of meeting stringent household and partial commercial requirements.

Core Technical Advantages and Performance Highlights of MQ-K5

The MQ-K5 uses optimized SnO₂-based sensitive materials, combined with Nexisense's proprietary doping process and multilayer composite film structure, achieving key breakthroughs:

• Strong Anti-Silicon Poisoning Capability: After exposure to high-concentration organic silicon as per CJ/T 347-2010, sensitivity retention far exceeds standard requirements. Even in kitchens with volatile silicones, the sensor maintains normal detection, with false alarm rates significantly below the industry average.

• Fast Response and Recovery: Response time to methane (main component of natural gas) and propane (main component of LPG) is typically within 10 seconds (T90). Rapid recovery after high-concentration exposure prevents "sticky" behavior, ensuring reliable subsequent detection.

• Excellent Long-Term Stability: After 5000 hours of high-temperature, high-humidity aging, zero drift and sensitivity changes remain within standard limits. Users report retaining over 90% of initial sensitivity even after 2+ years of use.

• Wide Environmental Adaptability: Operating temperature -10℃ to +55℃, humidity 15%–90% RH, with vibration-resistant design suitable for industrial sites or indoor environments with large temperature variations.

• Standardized Electrical Characteristics: Heating voltage 5.0±0.2V, adjustable load resistance, output signals compatible with most gas alarm mainboards for direct replacement.

These advantages stem from 40 years of materials and process expertise and deep understanding of real-world usage scenarios.

Applicable Scenarios: Comprehensive Protection from Kitchens to Factories

• Home Gas Alarms: Ideal for new standard home alarms, highly sensitive to natural gas, LPG, and coal gas, with excellent resistance to kitchen fumes and detergents. Suitable for high-rise apartments and old community renovations.

• Commercial Kitchens and Restaurants: Heavy oil fumes and frequent use of cleaning agents in medium-to-large kitchens require the MQ-K5’s anti-silicon poisoning and anti-interference features to reduce false alarms, minimizing unnecessary closures and complaints.

• Industrial and Commercial Gas Monitoring: Suitable for boiler rooms, gas regulating stations, cafeterias, and hotel kitchens, providing reliable combustible gas leak warning and integration with industrial alarm systems.

Nexisense also offers other MQ-K series models, covering natural gas, LPG, methane, propane, and more to meet differentiated needs.

Why Choose Nexisense?

With 40 years of focus on gas sensing R&D and manufacturing, Nexisense has built deep technical expertise and a strict quality control system. From raw material selection, sensitive material preparation, sintering processes, to final aging and screening, every step has a traceable quality control process.

We understand customer pain points: products must not only be reliable, but also have stable supply, consistent parameters, and easy replacement. Therefore, we provide:

• Batch consistency guarantee

• Complete new standard test reports and conformity declarations

• Rapid sample support and small-batch customization

• Professional technical consultation and joint debugging support

  
  

Frequently Asked Questions (FAQ)

1. Has MQ-K5 fully passed GB15322.2-2019 tests? Yes, it has passed all clauses, including anti-silicon poisoning, long-term stability, and interference gas testing.

2. How strong is its anti-silicon poisoning capability? It meets CJ/T 347-2010 high-concentration organic silicon exposure tests, with sensitivity retention far above the minimum standard.

3. Will kitchen fumes or alcohol cause false alarms? Cross-response to ethanol, cooking fumes, and other interferents is far below the threshold, greatly reducing false alarms.

4. Which gases can MQ-K5 detect? Primarily methane (natural gas) and propane/butane (LPG). It has some response to CO but is not a dedicated CO sensor.

5. What is the expected service life? Typically over 5 years in normal home environments, exceeding the industry average. Actual life depends on usage conditions.

6. Do I need to modify the circuit when replacing with MQ-K5? Electrical parameters are standard and compatible with most gas alarm mainboards for plug-and-play replacement.

7. Will high temperature and humidity affect performance? Tested for 5000 hours under high temperature and humidity, zero and sensitivity changes remain within standard limits.

8. How does MQ-K5 differ from MQ-5 or MQ-2? MQ-K5 is an upgraded version optimized for the new national standard, with comprehensive improvements in anti-silicon poisoning, long-term stability, and interference suppression.

9. Can MQ-K5 be used in industrial sites? Suitable for commercial and light industrial environments requiring moderate accuracy. High-risk industrial sites are recommended to use catalytic combustion or infrared sensors.

10. How to get samples and test reports? Contact Nexisense sales engineers, provide the application scenario, and request samples along with full new standard conformity declarations and test data.

Conclusion

Gas safety is critical. Even an invisible leak can impact countless households. The Nexisense MQ-K5 semiconductor gas sensor takes the new national standard as the baseline and user safety as the ceiling, leveraging 40 years of expertise to provide reliable sensing.

Whether in kitchens with rising oil fumes, curing silicone adhesives, or winter heating, it remains sensitive and alert; in quiet nights while elderly sleep, it remains loyal and vigilant. Choosing MQ-K5 means choosing peace of mind that withstands both time and environment.

Safety begins with sensing. Nexisense is committed to working with every partner to ensure gas leaks are no longer hidden hazards, and every return home brings added reassurance.