Recent Fire Accidents Warning and Industrial Fire Prevention Needs

Recent consecutive fire and flash explosion accidents at Jiuding Shopping Plaza in Zigong, Sichuan, and the processing workshop of Taihang New Materials Company in Chongzuo, Guangxi, have caused casualties and property losses, exposing the severe challenges in fire prevention and control in large commercial complexes, factory workshops, and similar venues. These venues are large in scale, with complex loads, dense electrical and process pipelines. Traditional point-type detectors are susceptible to obstruction and airflow interference, making it difficult to achieve early and reliable flame identification.

Industrial-grade flame detection technology has become key to enhancing fire prevention and control capabilities. The Nexisense flame sensor series focuses on the infrared radiation detection principle, providing millisecond-level response and high anti-interference performance, supporting deep integration with fire linkage systems, video surveillance, and automatic fire suppression equipment to achieve a closed-loop response from perception to suppression.

Typical Application Scenarios and Project Implementation Cases

Nexisense sensors are widely deployed in high fire risk areas:

• Large commercial complexes and warehousing logistics centers: Ceiling or high-level installation to achieve blind-spot-free coverage in open spaces, with detection distances up to 30-50m, linked with sprinkler systems and smoke exhaust valves.

• Petrochemical, oil storage tank areas, and flammable liquid warehouses: Targeting non-smoky liquid fires and flash explosion risks, using multi-band infrared detection to resist false alarms from sunlight and heat sources.

• Factory workshops and high-temperature process areas (such as metallurgy, papermaking, textiles): Monitoring sparks, embers, and detonation points, supporting docking with existing DCS or PLC systems.

• Fire water cannons and automatic fire suppression systems: Integrating pyroelectric modules to provide fire source azimuth signals, driving servo motors for precise positioning and extinguishing.

Actual project cases: In a storage tank area renovation project of a large petrochemical enterprise, the Nexisense pyroelectric flame sensor array was integrated with the existing fire water cannon system, achieving automatic fire source locking and remote confirmation functions, shortening the system response time to <5s and improving the safety level of unattended areas; in another commercial complex security upgrade project, multi-point distributed flame detectors were connected to the central fire control room, supporting Modbus TCP/IP protocol to achieve multi-source fusion judgment with smoke and temperature sensor data, significantly reducing the false alarm rate.

Nexisense Flame Sensor Technical Features and Selection Guide

The Nexisense product line covers mainstream infrared detection technologies:

Pyroelectric flame sensor (with lithium tantalate single crystal as the core): Curie temperature >600℃, excellent spectral response consistency in 1-20μm, high temperature stability (output change rate 1-2‰), featuring high detectivity, low noise, and anti-vibration characteristics. Typical field of view 120°, long detection distance, suitable for large space open monitoring.

Infrared photoconductive sensor (PbS/PbSe materials): Non-cooled TO-5 package, response band 1.0-5.0μm, targeting short-wave (1.0-3.0μm) and mid-wave (4.1-4.7μm) flame characteristic peaks, response time <10ms, high detectivity, suitable for rapid identification of detonations and open flames.

Selection key indicators:

• Detection distance and field of view: Prioritize large field-of-view pyroelectric type for open spaces; select faster-response photoconductive type for enclosed process areas.

• Anti-interference capability: Built-in flicker frequency analysis (typical flame characteristics 1-20Hz) and solar-blind filter to reduce false alarms from daylight and welding arcs.

• Output interface: Analog voltage, digital I2C/SPI, RS-485 Modbus RTU, supporting industrial bus integration.

• Environmental adaptability: Operating temperature -40~85℃, IP66/67 protection, optional explosion-proof type (Ex d IIC T6).

• Power consumption and installation: Low power consumption <100mW, standard installation interface compatible with existing brackets.

Integration considerations:

• Installation height and angle: Avoid direct strong light sources, recommend 45-60° downward viewing installation to cover the protected area.

• Signal processing: Use dual-band or multi-sensor fusion algorithms to compensate for background radiation and ambient temperature drift.

• System linkage: Trigger alarms, power cutoffs, start water cannons/gas suppression via relay output or Modbus registers.

• Regular calibration: Recommend sensitivity testing with standard blackbody radiation source every 6-12 months, recording response threshold changes.

• Redundancy design: Adopt dual/triple sensor configuration in high-risk areas to improve system availability.

OEM Customization and Bulk Supply Advantages

Nexisense supports flexible OEM/ODM cooperation, including:

• Sensitive material and band optimization: Adjust spectral response curves for specific fuels (such as hydrocarbons, alcohols).

• Interface and protocol customization: Extend Profibus, CANopen or proprietary protocols to adapt to customer control systems.

• Packaging and form factor: Provide TO package, modular PCB or integrated explosion-proof housing.

• Bulk production assurance: Stable supply chain, annual capacity supporting large-scale delivery, providing price gradients and long-term supply agreements.

Customers can obtain complete SDK, reference designs, EMC test reports, and joint debugging support to accelerate product introduction and certification processes.

Frequently Asked Questions (FAQ)

1. 1.How does the Nexisense pyroelectric flame sensor control false alarms under strong sunlight or high-temperature backgrounds?
   Built-in solar-blind filter and flame flicker frequency analysis algorithm (1-20Hz bandpass filtering), combined with dual-threshold judgment, sunlight interference false alarm rate <1%, high-temperature environment stability better than ±5% after temperature compensation.

2. 2.How to integrate Nexisense sensors into existing fire water cannon control systems?
   Provide fire source azimuth signals (angle resolution <2°) via RS-485 Modbus RTU or digital IO output, compatible with most PLC masters, supporting real-time data polling and event triggering, typical integration cycle 1-2 weeks.

3. 3.What specific fire types are infrared photoconductive sensors suitable for?
   Best response to non-smoky liquids, gas fuels, and detonation scenarios, highly sensitive to short-wave (PbS) and mid-wave (PbSe) flame peaks, millisecond-level response, suitable for flash point and spark monitoring.

4. 4.How does the system achieve multi-source data fusion between flame and smoke detectors?
   Nexisense provides fusion algorithm references, supporting Kalman filtering or logical AND/OR gate combinations, elevating alarm priority after flame confirmation to reduce the impact of single-sensor false alarms.

5. 5.What core parameters can be adjusted during OEM customization?
   Can optimize detection band, field of view, output protocol, alarm threshold, protection level, and packaging form, supporting firmware customization and batch burning.

6. 6.How to plan the typical lifespan and maintenance cycle of the sensor?
   Pyroelectric element lifespan >10 years, photoconductive >8 years; recommend annual functional testing and cleaning of optical windows, calibration of response sensitivity every 2 years.

7. 7.What requirements should be noted when deploying Nexisense sensors in explosion-proof areas?
   Explosion-proof models support Ex d IIC T6, can be directly installed in Zone 1; ensure good cable shielding and grounding, complying with IECEx or ATEX certification requirements.

8. 8.How to verify that the system complies with national or international fire detection standards?
   Nexisense sensors support third-party laboratory comparison testing, providing raw response data and reports to assist customers in completing certifications such as GB 4715, EN 54-10, or FM3260.

Conclusion

Facing the frequent occurrence of industrial fire accidents and increasingly stringent prevention and control standards, Nexisense flame sensors, with high-reliability infrared detection technology as the core, provide system integrators with reliable perception-layer solutions from early perception to rapid response. Through precise selection, standardized integration, and multi-system compatibility, it not only helps projects meet fire design specifications such as GB 50116 and NFPA 72 but also significantly improves the intrinsic safety level of high-risk venues.

As fire system integrators, industrial security solution providers, or equipment manufacturers, if you are advancing the construction, renovation, or upgrade of fire detection systems, the Nexisense team welcomes in-depth exchanges. We can provide on-site surveys, technical solution formulation, prototype verification, and bulk delivery support to jointly build a smarter and more reliable fire early warning system.

Looking forward to working with you to protect industrial production and public safety.