High-Quality Gas Detector Infrared Manufacturer & Manufacturers

Non-Dispersive Infrared (NDIR) sensors measure the specific light absorption of hydrocarbon molecules in the infrared spectrum according to the Beer-Lambert law. Catalytic sensors rely on chemical oxidation that physically burns flammable gas on a heated coil. Unlike catalytic beads, NDIR sensors are entirely immune to chemical poisons (such as silicones and H2S), require no oxygen to operate, and offer significantly longer operating lifespans with minimal zero drift.

The Lower Explosive Limit (LEL) represents the minimum atmospheric concentration of a combustible gas required to ignite; for methane (natural gas), 100% LEL corresponds to roughly 5.0% volume gas in air. Standard industrial regulations dictate that alarm setpoints must activate far beneath the actual danger threshold—typically configuring Level 1 (Low Alarm) at 10%–25% LEL and Level 2 (High Alarm) at 50% LEL to allow ventilation or automated emergency solenoid shut-off well before an explosive condition forms.

Mounting height is governed strictly by the relative vapor density of the target gas compared to ambient air (Air = 1.0). For gases lighter than air, such as Natural Gas / Methane (density ~0.55), point detectors must be located 0.3m to 0.6m beneath the ceiling, directly above probable leak points. For gases heavier than air, such as LPG / Propane (density ~1.55), sensors must be installed 0.3m to 0.6m above floor level, away from direct draft vents or air conditioning currents.

The JYFJS-011 aluminum alloy solenoid shut-off valve utilizes an ultra-fast pulse coil mechanism. When the connected detector or controller triggers an alarm output, the valve cuts gas transmission in milliseconds. Crucially, the valve is engineered with a mechanical locking mechanism that requires manual onsite resetting. If electrical power is cut or an intermittent failure clears, the valve remains firmly closed, preventing unchecked gas reinjection into compromised environments until authorized safety personnel inspect the premises.

Yes. Backed by 18+ years of dedicated manufacturing experience, 80+ product models, and in-house mold tooling, Shield provides complete turnkey OEM/ODM services for overseas distributors and system integrators. We support customized enclosure branding, modified RS485 communication protocols, specialized measuring ranges, multilingual documentation, and dedicated factory calibration certificates to meet regional conformity requirements.