Explore our ODM and OEM portable, fixed point-type, and household gas leak detectors engineered for zero-drift performance.
Strategic shift toward dual-gas monitoring ecosystems driven by ESG compliance, industrial automation, and smart city infrastructure.
In modern industrial safety, the demand for integrated gas monitoring solutions has undergone a paradigm shift. Enterprise procurement directors, EPC (Engineering, Procurement, and Construction) integrators, and global safety distributors no longer look for simple stand-alone alarm gadgets. Instead, they require sophisticated, dual-gas sensing hardware—specifically designed to detect both combustible Methane (CH₄) and toxic Carbon Monoxide (CO)—capable of seamless integration with industrial IoT (IIoT) platforms, SCADA control systems, and automated safety shut-off infrastructure.
Methane, the primary constituent of natural gas, presents a severe explosion hazard when concentrations reach its Lower Explosive Limit (LEL), typically between 4.4% and 15% by volume in air. Concurrently, incomplete combustion in industrial boilers, residential gas appliances, process heaters, and underground utility conduits generates Carbon Monoxide—a colorless, odorless, highly toxic gas that poses lethal risks even at minute ppm (parts per million) thresholds. Consequently, multi-gas detection systems that combine Methane LEL monitoring with low-level CO toxicity tracking have become mandatory across global regulatory frameworks.
Global buyers prioritize manufacturers with localized ODM custom design capabilities, enabling bespoke PCB layouts, tailored enclosure IP ratings, and proprietary firmware routines to meet specific market regulations without massive R&D overhead.
Modern B2B specifications dictate that point-type detectors must directly interface with electromagnetic solenoid shut-off valves (e.g., Shield JYFJS-011 Series) and central multi-channel gas controllers via RS485 Modbus or 4-20mA current loops.
Plant operators demand gas sensing nodes featuring temperature-compensated, poison-resistant sensors that minimize false alarms and reduce field maintenance costs across multi-year operational cycles.
An engineering breakdown of sensor physics, signal conditioning, cross-sensitivity elimination, and circuit topologies in Methane-CO monitoring.
Selecting the optimal sensor topology for Methane gas detection depends heavily on the operational environment, target concentration range, and presence of atmospheric contaminants:
Carbon Monoxide is primarily quantified using 3-electrode Electrochemical Sensors (Working Electrode, Counter Electrode, and Reference Electrode). CO diffuses through a porous membrane into an electrolyte solution, undergoing oxidation at the Working Electrode (CO + H₂O → CO₂ + 2H⁺ + 2e⁻). The resulting ionic current flow is directly proportional to the CO volume concentration in ppm.
A primary challenge in industrial ODM manufacturing is mitigating cross-sensitivity from background gases such as Hydrogen (H₂), Ethanol, and Methane itself. Shield’s advanced dual-channel ODM architectures incorporate integrated chemical filters, dual-working-electrode topologies (CO/H₂ compensated), and adaptive digital filtering algorithms to eliminate false toxic gas alarms caused by ambient industrial vapors.
| Technology Type | Target Gas | Detection Range | T90 Response Time | Poison Resistance | Expected Lifespan |
|---|---|---|---|---|---|
| Catalytic Bead (Pellistor) | Combustible (CH₄, LPG) | 0 - 100% LEL | < 15 seconds | Low (Silicone sensitive) | 3 - 5 Years |
| Optical NDIR (Infrared) | Methane (CH₄), Hydrocarbons | 0 - 100% LEL / Vol | < 10 seconds | Immune | 8 - 10+ Years |
| Electrochemical Cell | Toxic Carbon Monoxide (CO) | 0 - 500 / 1000 PPM | < 25 seconds | High (Requires H₂ filter) | 3 - 5 Years |
| MEMS Semiconductor | Household Combustible / CO | 0 - 20% LEL / Low PPM | < 20 seconds | Moderate | 5 - 7 Years |
From initial circuit schematic design to explosion-proof enclosure tooling, how Sichuan Shield Technology executes custom gas safety projects.
We provide full layout customization of multi-layer SMT PCBs, integrating ARM Cortex microcontrollers, customized OLED/LCD displays, configurable relay contact outputs, and custom wireless stacks (LoRaWAN, NB-IoT, Tuya Smart, Zigbee).
Our ODM factory facility designs die-cast aluminum alloy housings and high-impact polycarbonate enclosures rated up to IP67. We offer customized tooling for explosion-proof (Ex d IIC T6 Gb) flame-proof pathways to meet stringent hazardous location requirements.
Every ODM unit undergoes multi-point automated temperature calibration (-40°C to +70°C) inside sealed gas chambers. Traceable standard gas mixtures (NIST / certified CH₄ & CO gas standards) ensure precision accuracy across all batch runs.
Comprehensive safety ecosystems linking fixed detectors, central supervisory controllers, and emergency shut-off valves.
Deploying gas safety hardware in real-world commercial and industrial environments requires a closed-loop system design. Detection without automated mitigation leaves facilities vulnerable to human error during crisis events. Sichuan Shield Technology’s ODM platform provides an integrated three-tier safety ecosystem:
Industrial detectors (such as the SD2100E or SD2130 series) installed directly at high-risk points—boilers, gas regulator stations, and chemical mixing units—continuously monitor localized concentration levels and drive localized visual/audible alarms.
Central supervisory control panels (such as the Shield 8001AB Series) collect RS485 bus telemetry from up to 128 field nodes. They provide real-time concentration logging, zoned alarm management, dual-stage relay contacts, and direct SCADA output.
In the event of an alarm threshold trigger (e.g. 20% LEL CH₄ or 50 PPM CO), the controller fires a pulse output to pulse-driven solenoid shut-off valves (JYFJS-011 Series), instantaneously cutting off fuel gas supply at the main header.
Tailoring ODM products to match regional standards, market preferences, and international certification frameworks.
Gas detector procurement requirements vary substantially across global commercial and industrial sectors. Understanding these regional nuances is essential for overseas brands seeking ODM partnership:
Emphasizes compliance with UL 1484 (Residential Gas Detectors), UL 2034 (Single & Multiple Station CO Alarms), and Class I, Div 1 / Div 2 explosion-proof standards for industrial field devices. Modbus and BACnet IP protocols are highly favored for building automation.
Mandates strict compliance with EN 50194-1 (Combustible Gas Detection in Domestic Premises), EN 50291 (CO Detection), ATEX Directive 2014/34/EU for explosive atmospheres, and CE / RoHS environmental compliance. Compact, aesthetic wall-mount designs are required for residential sectors.
High demand for heavy-duty, high-temperature operable detectors (-40°C to +70°C) with IECEx certification. Rapid urbanization and massive gas grid expansion drive volume demand for residential Methane detectors linked directly to electromagnetic safety shut-off valves.
Ensuring zero-defect supply chains through rigorous factory quality management systems and comprehensive international certifications.
As a recognized "Specialized, Refined, Distinctive and Innovative" High-Tech Enterprise holding over 40 patents and China Compulsory Certification (3C), Sichuan Shield Technology Co., Ltd. operates a rigorous quality assurance infrastructure across every phase of ODM production:
Browse our complete line of industrial controllers, electromagnetic valves, and specialized leak detection pens.
Expert engineering answers to technical specifications, alarm setup, compliance standards, and ODM custom services.
Methane is measured in %LEL (Lower Explosive Limit), where 100% LEL corresponds to the lowest gas concentration in air capable of igniting (approx. 5.0% CH₄ by volume). Alarm thresholds for combustible gas are typically set at 20% LEL (A1) and 50% LEL (A2). Conversely, toxic Carbon Monoxide (CO) is measured in PPM (Parts Per Million) due to its extreme biological toxicity at very low concentrations. For CO, typical alarm thresholds are set at 30 PPM (low alarm) and 100 PPM (high alarm).
When the detector sensor registers a concentration exceeding the programmed safety setpoint, the internal MCU triggers an on-board electromagnetic relay or sends a high-energy capacitive pulse (typically 12V-24V pulse signal) directly to the solenoid gas valve (such as the Shield JYFJS-011 series). The pulse instantly trips the internal mechanical latch of the valve, snapping the gas line shut in under 1 second. For safety reasons, the valve requires a physical manual reset before gas flow can be restored.
Normal atmospheric air contains roughly 20.9% Oxygen by volume (%VOL). Because Oxygen represents a major constituent of air rather than a trace contaminant, quantifying depletion (hypoxia risk < 19.5% VOL) or enrichment (hyperoxia/combustion risk > 23.5% VOL) requires percentage by volume scaling (%VOL). Using a PPM scale (where 20.9% = 209,000 PPM) would produce unwieldy readings for field operators conducting pipeline work.
Sichuan Shield Technology provides comprehensive white-label and ODM capabilities including custom industrial enclosure colorways, private brand laser etching, custom boot screen logos on LCD/OLED displays, tailor-made RS485 Modbus register maps, unique relay logic configurations, bespoke alarm thresholds, and full packaging design customization.
We recommend conducting a zero-point check every 6 months and a full span calibration using certified span gas (e.g. 50% LEL CH₄ and 100 PPM CO) every 12 months under standard operational conditions. In harsh chemical processing environments with high dust, humidity, or ambient trace gas levels, a 6-month calibration cycle is recommended to ensure absolute SIL-2 reliability.
