Description

The 2108B2201 is a fixed‑point catalytic bead (pellistor) combustible gas detector manufactured by Honeywell as part of the Searchpoint Optima Plus (2108B Series) product line. This industrial‑grade gas sensor is designed for continuous monitoring of flammable hydrocarbon gases—including methane, propane, hydrogen, and solvent vapors—in hazardous industrial environments.

The 2108B2201 converts gas concentration in the 0‑100% Lower Explosive Limit (LEL) range into a standard 4‑20 mA analog signal, enabling seamless integration with most PLC, DCS, and safety instrumented systems . With its flameproof Exd IIC T6 enclosure and IP65/IP66 ingress protection, this detector is built for direct installation in Zone 1 hazardous areas without requiring costly intrinsic safety barriers.

Application Scenarios

In a coking plant or chemical processing facility, dozens of 2108B2201 detectors are positioned near pipe flanges, pump seals, compressor stations, and storage tank breathing vents. They continuously sniff for leaks of coke oven gas or process solvents before the atmosphere reaches explosive levels. When a hydrocarbon leak occurs and concentration crosses the configured alarm threshold—typically 20% LEL—the detector’s 4‑20 mA signal instantly triggers the plant’s DCS to initiate ventilation, sound area alarms, or execute emergency shutdown procedures .

This real‑time detection capability addresses the critical pain point that every plant manager fears: a small, undetected leak evolving into a catastrophic explosion. The 2108B2201 gives operators the precious minutes needed to intervene before gas concentrations enter the explosive range.

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