Wholesale Hexane Detector Manufacturers & Factory

The Lower Explosive Limit (LEL) for n-hexane is approximately 1.1% to 1.2% by volume in air (11,000 ppm to 12,000 ppm). In detector engineering, 1.1% Vol equals 100% LEL. Most standard industrial safety codes require low alarms (AL1) to be calibrated at 20% to 25% LEL (approx. 2,200 to 2,750 ppm) and high alarms (AL2) at 50% LEL. Shield detectors feature field-configurable setpoints to match specific jurisdictional codes and risk protocols.

Relative vapor density determines installation elevation. Methane has a vapor density of ~0.55 relative to air, making it buoyant and requiring ceiling-level placement. Hexane vapor has a relative density of approximately 2.97 to 3.0, meaning it is three times heavier than air. In solvent recovery and manufacturing sites, hexane detectors such as the SD2100A must be mounted near the floor—typically 0.3m to 0.6m above the lowest walking surface—to detect early pooling before concentration rises.

Catalytic pellistor sensors accurately detect hexane in the 0–100% LEL range through thermal catalytic oxidation, offering high reliability at an attractive wholesale cost. However, in low-oxygen atmospheres (such as nitrogen purge tanks) or where occupational health mandates low-ppm toxicity detection (OSHA PEL is 500 ppm; NIOSH REL is 50 ppm), Non-Dispersive Infrared (NDIR) or Photoionization Detectors (PID) are required. Shield provides both catalytic combustion and optical solutions across our industrial platforms.

When a field detector (e.g., SD2100E) senses a concentration exceeding AL1 or AL2 thresholds, it transmits telemetry via 4–20mA or bus link to the SD8001AB Gas Alarm Controller. The controller immediately energizes onboard programmable relay outputs, sending an instantaneous pulse (such as 12V/24V) to the JYFJS-011 aluminum alloy solenoid shut-off valve. The valve snaps closed in milliseconds, isolating pipeline headers. The JYFJS-011 requires manual reset, preventing unauthorized reopening before full line safety inspection.

As an integrated R&D factory owner with 18+ years of expertise and over 40 patents, Shield supports complete private-label manufacturing. This includes custom silk-screened housing branding, bespoke aluminum die-cast tooling, modified output protocols (RS485 Modbus, 4–20mA, LoRa, Wireless 4G), tailored sensor sensitivity calibrations for non-standard target solvents, and localized user manual documentation.

Standard industrial practice recommends a bump check every 3 to 6 months and a full span recalibration at least once every 12 months using certified n-hexane or surrogate pentane gas mixtures. Shield's SD2100 series supports non-intrusive one-person calibration via handheld infrared remotes, allowing technicians to zero and span the detector in explosive environments without removing the flameproof enclosure cover.