Industrial Point
Flagship Engineering Showcase
Pre-Engineered Residential, Commercial & Portable Gas Safety Lines
Verified, certified gas-detection instrumentation and fail-safe electromagnetic valves engineered in Chengdu, China. Available for direct volume OEM/ODM batch customization.
ODM Industrial
ODM Industrial and Commercial Gas Detector SD2100A Series - China Suppliers and Factory for Reliable Gas Monitoring Suppliers, Factory
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Stand-Alone Point
OEM Industrial and Commercial Gas Detector SD2130 Series - China Suppliers and Factory for Reliable Gas Detection Solutions Supplier, Factories
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Emergency Valve
High-Quality China JYFJS-011 Aluminum Alloy Electromagnetic Shut-off Valve - Gas Safety Solutions from Reliable Suppliers and Factory Suppliers, Factories
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Domestic Alarm
Wholesale Household Combustible Gas Detector Shield SD6103K Series - Reliable Safety Solution from China Suppliers and Factory Manufacturer, Factories
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Domestic Compact
Wholesale China SD6101 Series Household Combustible Gas Detector - Reliable Safety Solutions from Top Suppliers and Factory Factory, Factories
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Sniffer Pen
High-Quality Portable Gas Detector Pen JLY-50A Series - Reliable Gas Detection by China Suppliers and Factory Manufacturer, Supplier
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Field Technician Tool
OEM Portable Gas Detector Pen JLY-50A Series - China Suppliers & Factory for Industrial Safety Monitoring Supplier, Suppliers
View Specifications18+
Years Gas Safety R&D
80+
Market-Proven Models
40+
Core Technology Patents
100%
Burn-In & Calibration
Authoritative OEM/ODM Partner
Engineering Rigor in Domestic Combustible Gas Detection
Headquartered in the Southwest Airport Economic Development Zone of Chengdu, Sichuan Shield Technology Co., Ltd. is recognized as a National High-Tech Enterprise and a Specialized & Innovative Enterprise. We bridge precision micro-sensor fabrication with complete systems-level manufacturing.
Domestic gas alarms are safety-critical life-support electronics. Unlike consumer gadgets, an uncalibrated error or a false alarm causes panic, unnecessary municipal emergency dispatch, or catastrophically undetected methane leaks. In the global B2B procurement environment, system integrators, city gas utility providers, and private-label fire brands require an original design manufacturer (ODM) with proven chemical sensing capabilities, electrical safety compliance, and robust production continuity.
Systemic Sensing Fusion
Unlike simple PCB assemblers, Shield manufactures the complete gas safety loop: household gas alarms (SD6200, SD6103K, SD6101), point-type industrial detectors (SD2100A, SD2130), multichannel bus controllers (SD8001A/B), and high-integrity aluminum electromagnetic shut-off valves (JYFJS-011).
- Guaranteed signal-response compatibility
- High-speed pulse driving for shut-off valves
- Single-source warranty accountability
Compliance & Laboratory Rigor
Our instruments hold mandatory China Compulsory Certification (3C/CCC), national metrology licenses, and explosion-proof credentials. We design and validate hardware to align with EN 50194-1/-2, UL 1484, and ISO 9001/14001/45001 production mandates.
- Calibrated across 1% to 25% LEL operational thresholds
- Extensive siloxane, ethanol, and humidity anti-poisoning testing
- Comprehensive EMC / ESD surge immunity engineering
Turnkey ODM Scalability
From custom ID/MD design, precision injection molding, multi-layer SMT layout, embedded firmware tuning, to certified test fixture programming, Shield provides an agile concept-to-market pipeline for global tier-one safety brands.
- Proprietary firmware calibration algorithms
- Flexible protocol stacks: Zigbee, NB-IoT, Matter, LoRa
- Scalable volume production exceeding 200,000 units/mo
R&D Technology Roadmap
The Evolution of Residential Gas Sensing: Physics, Chemistry & Smart IoT
Understand the engineering trade-offs between catalytic combustion, planar semiconductor (MOS), MEMS nanotechnology, and optical NDIR sensing in residential life-safety deployments.
Residential combustible gas detection is primarily targeted at two main fuel gases: Natural Gas (predominantly Methane, CH4) and Liquefied Petroleum Gas (LPG, primarily Propane C3H8 and Butane C4H10). Natural gas is lighter than air (relative density ~0.55), necessitating detector placement within 30 cm of the ceiling. In contrast, LPG is heavier than air (relative density ~1.5 to 2.0), demanding floor-level placement within 30 cm of the ground. The detection technology must ensure high stability across 5 to 10 years of continuous operation, enduring thermal cycling, cooking fumes (ethanol, vinegar, airborne cooking oils), and fluctuating relative humidity.
| Sensing Architecture | Operational Principle | Response Time (T90) | Interference Resilience | Typical Service Life | Ideal Application Scenario |
|---|---|---|---|---|---|
| Hot-Wire Semiconductor (MOS) | SnO2 surface oxygen adsorption modulates electrical conductivity in the presence of reducing gases. | < 15 seconds | Moderate; requires anti-cross-talk software filtering against cooking alcohol. | 5 - 8 Years | Cost-Effective Residential Alarms (SD6101 / SD6103K) |
| Catalytic Combustion (Pellistor) | Heterogeneous catalytic oxidation on a platinum-coated active pellistor induces differential Wheatstone bridge voltage. | < 10 seconds | High linear accuracy across 0–100% LEL; susceptible to hexamethyldisiloxane (HMDS) poisoning. | 3 - 5 Years | Heavy-Duty Kitchens & Point Detectors (SD2130 / SD2100A) |
| MEMS Micro-Hotplate Sensor | Micromachined silicon substrate with ultra-low thermal mass, nanoscale metal-oxide catalyst layer. | < 8 seconds | High; micro-pulsed temperature modulation discards transient interference. | 8 - 10 Years | Next-Gen Ultra-Thin Smart Home & Battery Alarms |
| Non-Dispersive Infrared (NDIR) | Beer-Lambert absorption at the 3.3μm hydrocarbon fundamental C-H vibrational resonance band. | < 12 seconds | Immune to chemical poisoning; unaffected by zero oxygen; zero cross-sensitivity to ethanol. | > 10 Years | Premium Commercial Kitchens & Remote Utility Metering |
Hydrogen (H2) Transition Readiness
As city gas grids pilot hydrogen-methane blending (H2 blends from 5% to 20%), catalytic and MOS detectors must accommodate modified flame speeds, altered LEL percentages (Pure CH4 LEL: ~5.0% vol; Pure H2 LEL: ~4.0% vol), and altered thermal dissipation coefficients without generating phantom alarms.
IoT Unified Connectivity
Modern homes integrate alarms into central home automation. Shield ODM architectures embed Matter-over-Thread, Zigbee 3.0, Wi-Fi 6, and long-range cellular NB-IoT/Cat-M1 modules, sending instant push alarms, battery life telemetry, and remote sensor health status to cloud dashboards.
Dual-Gas CH4 + CO Co-Detection
Faulty cookers, obstructed flues, and improper ventilation frequently generate deadly carbon monoxide (CO) alongside unburned fuel gases. Shield combines an MOS hydrocarbon sensor with an electrochemical CO cell, driving dual alarms based on distinct health threshold timelines.
Edge-AI Drift Compensation
Thermal and moisture variations cause micro-baseline drift in MOS sensors over seasons. Shield’s embedded ARM-Cortex firmware continuously updates the baseline during clean air cycles, using multidimensional curve compensation to preserve accurate calibration over years of operation.
Smart Manufacturing & Supply Infrastructure
China Industry 4.0: Supply Chain Resilience, Scalability & Traceability
Inside Sichuan Shield’s high-tech manufacturing center: How automated SMT lines, automated multi-gas calibration tunnels, and MES digital twins protect your brand reputation.
The Critical Defect Bottleneck in Cheap White-Label Alarms
A gas alarm cannot be tested simply with electric meters. Conventional assemblers skip continuous gas calibration or test with unregulated cigarette lighter fluid. Shield runs automated 100% full-inspection test tunnels using traceable standard span gases (Methane/Air, Propane/Air) certified by national metrological authorities.
Automated SMT & Nitrogen Reflow
Our production runs high-precision surface mount lines equipped with 3D Solder Paste Inspection (SPI), automated optical inspection (AOI), and multi-zone nitrogen-purged reflow ovens. This guarantees micro-gap solder integrity, eliminating solder voids that cause sensor impedance drift.
- 0201 component placement capability
- Conformal coating prevents kitchen grease degradation
- In-circuit functional test (ICT) on 100% of PCBA batches
Automated Multi-Point Calibration Tunnels
Every detector travels through enclosed computerized test chambers where clean zero air, 10% LEL, and 25% LEL test gas concentrations are injected under controlled temperature (20°C ± 2°C) and relative humidity (50% ± 5% RH). Internal digital potentiometers auto-trim without manual intervention.
- Eliminates human assembly calibration error
- Individual sensor sensitivity curve stored in internal EEPROM
- Real-time acoustic sound pressure test (>85dB at 3m)
MES Cloud Traceability & Supply Cluster
Situated in Chengdu's advanced industrial corridor, Shield leverages an integrated ecosystem of precision plastic toolmakers, stamped metal stamping shops, and certified solenoid coil manufacturers. Our MES gives every serial number end-to-end component traceability for 10 years.
- Barcode-linked sensor lot and component vendor logs
- Rapid raw material replenishment within 48 hours
- High resistance to international logistics disruptions
Comprehensive Engineering Deployments
Integrated Solutions: From Modern Kitchens to Urban Infrastructure
A gas alarm is most effective as part of an active defense ecosystem. Shield designs the interconnected sensor-to-valve loop that stops leaks at the source.
Smart Residential Apartments & Housing
For large-scale real estate developers and municipal social housing initiatives. The SD6103K or SD6200 detector monitors indoor kitchen environments 24/7. When gas exceeds 5%–10% LEL, it triggers an audible-visual siren, drives the JYFJS-011 aluminum shut-off valve within 1 second, and transmits an alarm event to the resident's mobile app and building management system.
- Direct 12V pulse output for instant valve trip
- Relay contact for kitchen exhaust fan activation
- Manual reset prevents automatic gas restoration
Commercial Kitchens & Multi-Tenant Retail
Restaurants, hotel kitchens, food plazas, and bakery shops experience sustained humidity, oil mist, and frequent temperature changes. Shield provides the heavy-duty SD2130 stand-alone point detector, which houses an IP65 cast housing and catalytic sensor, driving multi-channel shut-off valves without requiring an expensive control cabinet.
- High-power relay for direct exhaust ventilation
- Rugged die-cast housing resists high grease loads
- Clear on-site digital percentage concentration display
Gas Utility AMI & Concessionaire Safety
Natural gas distribution companies require unified residential risk reduction. When combined with smart gas meters (AMI/AMR), our low-power NB-IoT and LoRaWAN domestic alarms provide the gas utility command center with real-time pressure, leak notification, and tamper detection across entire metropolitan sectors.
- Reduces annual safety inspection labor by 70%
- Remote battery health and sensor end-of-life status
- Encrypted protocols preventing malicious hijacking
Global Regulatory Alignment
Localization Support & International Certification Assurance
Customizing electrical compliance, localized frequencies, safety thresholds, and structural enclosures to pass regional audits without friction.
European Union: EN 50194
We configure ODM firmware and test reports to comply with EN 50194-1 (Electrical apparatus for the detection of combustible gases in domestic premises) and EN 50194-2 (Recreational vehicles). Includes strict CE-EMC (EN 50270) and LVD (EN 61010-1) test compliance.
North America: UL 1484
For US and Canadian distributors, our engineering addresses UL 1484 standard requirements for residential gas detectors, incorporating flame-retardant 94V-0 rated polymer enclosures, 120V AC polarized line cords, and designated alarm tones conforming to temporal audible patterns.
Power & Plug Adaptations
Power configurations engineered for wide-range AC inputs: 90V–264V AC at 50/60Hz, or isolated low-voltage DC inputs (12V/24V DC) for yacht and RV integrations. Standardized supply includes EU, UK, US, Australian, and Brazilian plug standards.
RF Bands & Certifications
We handle wireless certification testing across regional frequency allocations: 868 MHz for Europe, 915 MHz for North America, and country-specific cellular bands (B1/B3/B5/B8/B20/B28) for NB-IoT. Complete support for FCC, IC, and CE-RED filing documentation.
Turnkey Collaboration
Enterprise ODM/OEM Procurement Roadmap & Lifecycle Validation
A structured stage-gate development workflow designed to minimize tooling risk, fast-track compliance approvals, and guarantee long-term field reliability.
01. Concept & DFM
Review customer product requirements (PRD), target gas types, communication protocols, custom industrial design (ID), and mechanical tooling feasibility (DFM).
02. Prototyping
Rapid CNC prototype development, precision 3D-printed housing fit, initial PCB layout, and custom firmware flashing for preliminary bench gas testing.
03. Mold Tooling
High-precision injection tooling fabrication with flame-retardant PC/ABS polymers. Acoustic sound tunnel optimization ensuring >85dB sound pressure distribution.
04. EVT / DVT Runs
Engineering and Design Validation Testing: Accelerated life testing (ALT), thermal shock (-20°C to +55°C), high-humidity drop, vibration, and EMI chamber screening.
05. Mass Production
High-speed automated production with 100% gas-point calibration in nitrogen/air tunnels, customized private-label laser etching, custom retail packaging, and global logistics dispatch.
Technical & Sourcing Intelligence
Frequently Asked Questions: B2B Technical Due Diligence
In-depth engineering answers addressing Lower Explosive Limits, sensor lifespan, siloxane poisoning, valve linkages, and ODM customization terms.
What is the explicit difference between %LEL and %VOL, and how does it determine alarm setpoints?
Lower Explosive Limit (LEL) is the minimum volume concentration of combustible gas in air at which it can propagate a flame when ignited. For methane (CH4), 100% LEL corresponds to approximately 5.0% volume in air (%VOL). For propane (LPG), 100% LEL is approximately 2.1% VOL. A domestic detector does not wait for 100% LEL; standard safety regulations (such as EN 50194 or GB 15322.2) require the primary alarm to trigger between 5% and 20% LEL (typically at 10% LEL). This provides an early warning window long before an explosive mixture can accumulate.
Why is sensor poisoning a critical factor, and how does Shield mitigate cooking contamination?
Kitchen environments contain airborne siloxanes (found in cosmetics, silicon cookware, and polishes), volatile organic compounds (ethanol from cooking wine), acetic acid, and aerosolized cooking grease. Siloxanes decompose on heated sensor elements to form an insulating silicon dioxide (SiO2) glass layer, irreversibly desensitizing the sensor. Shield employs multi-layer sintered carbon gas-permeable filters, elevated catalytic operating temperatures, and proprietary chemical dopants in our semiconductor sensor formulas to oxidize and repel common poisoning agents, preserving sensor response across a 5-year operating lifespan.
How does the electromagnetic shut-off valve (JYFJS-011) interface with domestic detectors?
Shield’s domestic alarms (e.g., SD6200, SD6103K) feature an onboard capacitive discharge circuit. When a confirmed gas alarm state persists for 2 to 3 seconds, the detector discharges an instantaneous 12V DC high-current pulse (1.5A for ~50ms) through the coil of the JYFJS-011 aluminum alloy valve. The electromagnetic coil disengages the mechanical permanent magnet latch, allowing a spring-loaded valve seal to close the gas pipe in under 1 second. Crucially, the valve is engineered for manual reset only: the gas flow cannot re-open automatically until a certified technician physically inspects the leak and pulls the manual reset knob.
What customization options are offered under your ODM private-label agreements?
Our ODM service covers complete mechanical, electronic, and software customization:
(1) Industrial Design (ID): Custom enclosure geometry, custom silk-screen/laser logos, LED status colors, and specialized mounting backplates.
(2) Firmware & Calibration: Pre-programmed regional alarm thresholds (e.g., 7% LEL for Japan/Korea, 10% LEL for Europe, 20% LEL for US specs), custom warm-up intervals, and language-specific voice prompt modules.
(3) Connectivity: Integration of Tuya, Matter, Zigbee, Z-Wave, or cellular NB-IoT communication boards.
(4) Packaging: Custom multi-lingual retail packaging, barcode integration, and manuals.
What is the standard warranty, Mean Time Between Failures (MTBF), and end-of-life signaling?
Shield domestic gas alarms are engineered for an MTBF of greater than 50,000 hours (over 5 years) under normal kitchen operating conditions. We provide a baseline 2- to 3-year factory warranty, extendable based on client procurement contracts. To prevent dangerous operation past sensor expiration, our microcontroller firmware logs cumulative power-on hours. When the sensor reaches its 5-year end-of-life milestone, the detector alerts the user with a distinct yellow fault LED flash and periodic acoustic chirping, indicating replacement is required.
What are the minimum order quantities (MOQ) and production lead times for OEM/ODM orders?
For standard Shield-branded or neutral housing models (SD6101, SD6103K, SD2100A, JYFJS-011), the MOQ is 100 units, with dispatch within 7 to 15 working days. For custom private-label branding with custom silk-screen printing and packaging, the typical MOQ is 1,000 units, with lead times of 3 to 4 weeks. Full custom ODM projects requiring dedicated plastic injection tooling have an initial delivery schedule of 60 to 90 days, covering mold fabrication, first-article inspection (FAI), and EVT sample approval.
Complete Gas-Safety Ecosystem
Integrated Commercial, Industrial & Portable Safety Portfolio
Complete product portfolio engineered for utility networks, commercial kitchens, service technicians, and municipal installations. Compatible with Shield emergency shut-off valves.
OEM Domestic
OEM China Household Combustible Gas Detector Shield SD6103K Series - Reliable Safety Solution from Trusted Suppliers and Factory Supplier, Factories
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Alloy Solenoid
High-Quality China Aluminum Alloy Electromagnetic Shut-off Valve JYFJS-011 Series - Reliable Suppliers & Factory Supplier, Suppliers
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Fast Shut-Off
High-Quality China JYFJS-011 Aluminum Alloy Electromagnetic Gas Emergency Shut-off Valve - Top Suppliers & Factory Manufacturers, Suppliers
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Kitchen Safe
OEM Household Combustible Gas Detector Shield SD6103K Series - Safe Solutions from China Suppliers and Factory Manufacturer, Suppliers
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Portable Handheld
Wholesale Portable Gas Detector Shield SD3001 Series – Reliable China Suppliers & Factory for Industrial Safety Monitoring Manufacturer, Supplier
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OEM Domestic
OEM China SD6101 Household Combustible Gas Detectors - Reliable Safety Solutions from Trusted Suppliers and Factory Manufacturer, Suppliers
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ODM Valve
ODM China JYFJS-011 Aluminum Alloy Electromagnetic Gas Shut-off Valve - Suppliers & Factory for Safety Solutions Manufacturer, Suppliers
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Multi-Gas Confined Space
ODM 4 in 1 Portable Gas Detector Shield BTYQ-Z4 Series Manufacturers, Supplier
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Direct Factory Sourcing
Engineering Headquarters & Manufacturing Facility
Contact the direct engineering and export department at Sichuan Shield Technology Co., Ltd. for turnkey project specifications, custom samples, and bulk ODM quotes.
Factory Address
502, Zone 7, Haolang Technology Park, 2666 Airport Road 4, Southwest Airport Economic Development Zone, Shuangliu District, Chengdu, Sichuan, China.
Export & Engineering Contacts
Phone: +86-28-81511655
Mobile/WhatsApp: +86-18553635812
Email: [email protected]
Global Certifications
ISO9001, ISO14001, ISO45001 certified quality infrastructure. China Compulsory Certification (3C/CCC), Explosion-Proof Ex certification, with third-party testing aligning with EN 50194 and UL 1484 requirements.