High-Quality Portable Single Gas Detector Factory & Factories

Electrochemical sensors utilize chemical oxidation-reduction reactions on a sensing electrode to quantify toxic gases (like CO, H₂S, SO₂, NH₃) at micro-levels (ppm). Catalytic bead (pellistor) sensors burn combustible gases across a platinum coil to measure %LEL; they require oxygen to function and are prone to poisoning by silicones or lead. NDIR (Infrared) sensors measure light absorption of hydrocarbon bonds; they require zero oxygen, cannot be poisoned, and offer extremely long operational lifespans, making them ideal for inerted tank inspections.

Every combustible gas possesses a unique Lower Explosive Limit (LEL) by volume in air—for Methane (CH₄), 100% LEL corresponds to 5.0% by volume, while for Propane (C₃H₈), 100% LEL is 2.1% by volume. Catalytic sensors exhibit different heat-of-combustion responses to different molecules. Shield provides factory calibration curves and relative response cross-sensitivity correction factors in our firmware so a single detector can accurately report true %LEL across diverse industrial hydrocarbon vapors.

Per international OSHA and ISEA guidelines, a bump test (a brief exposure to challenge gas to confirm sensor responsiveness and audible/visual alarm activation) should be executed before each day's use. A complete span calibration (zero balance and span adjustment against known certified concentration gas cylinders) should be conducted periodically—typically every 3 to 6 months depending on environmental severity and exposure frequency.

Yes. Shield portable detectors feature external housings molded with high-density engineering thermoplastics sealed with precision silicone gaskets, delivering IP66/IP67 ingress ratings. The gas intake aperture incorporates a breathable hydrophobic and oleophobic PTFE membrane filter that allows ambient gas diffusion while stopping liquid water droplets and airborne particulates from contaminating the sensor cell.

For standard off-the-shelf Shield models, there is no minimum order quantity. For customized OEM packaging, silk-screened brand logos, and tailored firmware boot screens, our typical MOQ starts at 100 units. For completely custom plastic housing injection colors or modified chassis molds, MOQ starts at 500 units. Lead times range from 7–14 days for standard batches to 30 days for complete OEM production cycles.

Shield’s JYFJS-011 aluminum alloy emergency shut-off valve utilizes an electromagnetic solenoid trigger driven by the relay output of our fixed detectors (such as the SD2130 or SD6200). When combustible gas reaches the AL1 setpoint, the detector fires an electrical pulse within 50 milliseconds, dropping the valve plunger to instantly cut gas flow. The valve incorporates a mandatory manual mechanical reset latch, preventing accidental automatic reopening before the leak has been repaired.