High-Quality Cl2 Detector Manufacturer & Factories

Combustible gases such as methane (CH4) or propane (LPG) present catastrophic explosion risks measured relative to their Lower Explosive Limit (LEL), where 100% LEL for methane is approximately 5% by volume (50,000 ppm). In contrast, chlorine (Cl2) is not primarily an explosive hazard; it is an aggressively toxic, oxidizing chemical whose physiological danger occurs at trace airborne levels. Inhaling 1 to 3 ppm causes immediate mucus membrane irritation; 10 ppm causes severe respiratory spasms; and 30 to 50 ppm can be rapidly fatal. Because life-threatening toxic injury manifests at microscopic fractions, Cl2 detection is calibrated exclusively in parts per million (ppm) or mg/m³, where 1 ppm Cl2 = 2.95 mg/m³ at standard temperature and pressure.

Chlorine has a relative vapor density of 2.45 compared to air (which has a reference density of 1.0). Consequently, escaping chlorine gas does not rise; it sinks towards the floor and accumulates in low-lying zones, trenches, and sump pits. Detectors must be mounted approximately 15 to 30 cm (6 to 12 inches) above the floor, positioned in close proximity to potential leak pathways like cylinder valves, header unions, and dosing pumps. For indoor rooms, one detector covers approximately 30 to 50 square meters depending on ventilation cross-drafts. In outdoor cylinder farms, wind-direction mapping and 5-meter grid spacing are recommended.

Electrochemical Cl2 sensors operate by reducing chlorine molecules on a sensing electrode, generating an electrical current directly proportional to the gas concentration. Because chlorine is a powerful oxidizer, other strong oxidizers like Ozone (O3), Chlorine Dioxide (ClO2), Bromine (Br2), and Nitrogen Dioxide (NO2) can cause positive cross-interference. Sichuan Shield counters cross-talk by integrating multi-stage catalytic scrubbing membranes and differential sensor pairs that eliminate ambient false positives. Furthermore, our modern solid-state polymer electrolytes eliminate water loss/gain problems, ensuring stable operation across 15% to 95% non-condensing relative humidity.

Yes. Point-type detectors like our SD2130 and SD2100 series feature onboard passive dry-contact relays rated at 2A/30VDC or 1A/220VAC. Upon reaching the configured low or high alarm limit (e.g., 1.0 ppm), the detector energizes the tripping coil of an electromagnetic emergency shut-off valve (such as the JYFJS-011 aluminum alloy series), snapping the pipeline closed in under 1 second. Shield valves require a manual pull-to-reset lever, guaranteeing that toxic gas flow cannot resume automatically until plant operators inspect the physical fault and confirm the area is cleared.

Because chlorine is a reactive gas that readily adsorbs to delivery tubes and chamber walls, calibration must follow stringent protocols. We recommend performing a bump check every 30 to 60 days and a comprehensive span calibration every 6 months using specialized Teflon/PTFE tubing (avoid silicone or rubber, which absorbs chlorine). The typical operational lifespan of an electrochemical chlorine cell ranges from 24 to 36 months under standard conditions. Shield's intelligent transmitters track cumulative electrochemical load and prompt predictive replacement before sensor sensitivity drops below 50%.

With 18+ years of dedicated engineering and vertical factory ownership in Chengdu, Shield provides complete turnkey private labeling. Our capabilities include custom CNC enclosure colors, laser-engraved stainless logos, branded OLED booting animations, custom wiring glands (M20, 1/2" NPT, 3/4" NPT), modified Modbus memory registers, specialized alarm controller channel expansions (from 1 to 64 loops), and multi-lingual user manuals formatted to meet local market certification prerequisites.