ODM LPG Gas Detector Supplier & Factory

LPG is composed primarily of propane and butane, both of which possess molecular weights substantially heavier than ambient air (propane vapor density ~1.55; butane ~2.08 relative to air = 1.0). Consequently, escaped LPG settles downward and pools along floor levels, utility pits, and low-lying trenches. LPG detectors must always be mounted low, typically 0.3 meters (12 inches) above the finished floor level, and within 1.5 to 3.0 meters of potential leak sources (appliances, cylinders, valves). Conversely, Methane (natural gas) is lighter than air (~0.55 relative density) and requires ceiling-adjacent mounting within 0.3 meters of the ceiling.

The JYFJS-011 aluminum alloy emergency shut-off valve operates on an ultra-fast electromagnetic pulse release mechanism. When triggered by the detector's relay output or central fire alarm loop, the internal spring mechanism slams closed in less than 1.0 second. To ensure complete safety, the valve cannot be reopened electrically or remotely. It requires certified field personnel to physically inspect the piping, confirm that the gas hazard is cleared, and manually pull the red reset pin on the valve body. This eliminates accidental automatic resumption of gas supply into an unresolved hazardous condition.

Specify a standalone point detector such as the SD2130 Series for single-zone, self-contained installations like independent commercial restaurants, small boiler rooms, and residential utility rooms. The SD2130 incorporates its own audible/visual alarms and dual dry-contact relays to trip valves and exhaust fans locally without needing a controller. For large facilities, factories, and multi-tenant residential complexes, specify bus-type detectors like the SD2100A or SD2100E linked back to an SD8001AB Series central controller. Networked architectures allow centralized management in non-hazardous control rooms, continuous telemetry recording, and coordinated multi-tier safety responses.

This distinction is rooted in human physiological risk versus combustion physics. Combustible gases like LPG and methane present fire and explosion hazards when they reach their Lower Explosive Limit (LEL). For propane, the LEL is approximately 2.1% by volume. Measuring in %LEL provides a standardized 0–100% scale indicating how close the environment is to an explosive threshold. Oxygen is monitored in %VOL (Volume Percent) because ambient air is normally 20.9% O₂, and physiological distress occurs rapidly outside 19.5%–23.5% VOL. Toxic gases like Carbon Monoxide (CO) or Hydrogen Sulfide (H₂S) are lethal at microscopic concentrations, requiring high-precision measurement in Parts Per Million (PPM).

As a direct factory manufacturer in Chengdu with fully integrated R&D, tooling, SMT, and testing lines, Sichuan Shield offers flexible tiers for global partners. Standard private-label silk-screening and localized packaging configurations start with an MOQ of 500 units with typical lead times of 15 to 25 days. Full custom ODM developments—including custom injection tooling, custom PCB form-factors, and proprietary communication protocols—typically require 45 to 60 days from approved CAD engineering drawings to validated pilot production runs.