Description:The Honeywell 2108B2201 is a fixed-point catalytic bead (pellistor) gas detector from the Searchpoint Optima Plus series. It is designed for continuous monitoring of flammable gases (like methane, propane, and solvents) in industrial environments. The device outputs a standard 4-20 mA analog signal proportional to the gas concentration (0-100% LEL), making it compatible with most PLC and DCS control systems. With Exd IIC T6 explosion-proof certification and IP65 protection, it is suitable for direct installation in hazardous Zone 1 areas.Application Scenarios:In a Taiyuan coking plant or chemical facility, multiple 2108B2201 detectors are installed near pipe flanges, pump seals, and storage tanks. They continuously monitor for leaks of coke oven gas or process solvents. If a leak occurs and concentration reaches a preset alarm level (e.g., 20% LEL), the 4-20 mA signal triggers an alarm in the plant’s safety system, allowing operators to initiate ventilation or shutdown procedures before the gas concentration reaches the explosive range.
Parameter:
| Parameter | Specification |
|---|---|
| Product Model | 2108B2201 |
| Manufacturer | Honeywell (formerly Sieger) |
| Product Series | Searchpoint Optima Plus (2108B Series) |
| Detection Principle | Catalytic Bead (Pellistor) |
| Target Gas | Combustible Gases (Methane, Propane, Hydrogen, Solvent Vapors) |
| Detection Range | 0 – 100% LEL (Lower Explosive Limit) |
| Output Signal | 4 – 20 mA (2-wire or 3-wire loop powered) |
| Accuracy | ±5% FS (Full Scale) |
| Response Time (T90) | < 30 seconds (typical) |
| Power Supply | 12 – 24 V DC (typically 24 V DC) |
| Power Consumption | ≤ 1.5 W |
| Sensor Life | 3 – 5 years (depending on exposure) |
| Operating Temperature | -20°C to +50°C |
| Enclosure Rating | IP65 (Dust-tight, protected against water jets) |
| Hazardous Area Certification | Exd IIC T6 (ATEX, IECEx for Zone 1) |
| Calibration | Requires periodic bump test & calibration with standard gas |
Technical Principles and Innovative Values:
- Innovation Point 1: Robust Catalytic Bead Technology: The sensor contains a heated bead that catalyzes the combustion of flammable gases. The resulting heat change alters the electrical resistance, providing a linear and reliable signal. This mature technology offers excellent value for money for general hydrocarbon detection in harsh industrial settings like those in Shanxi’s heavy industry sector.
- Innovation Point 2: Intrinsic Safety via Explosion-Proof Enclosure: The 2108B2201 uses a flameproof (Exd) enclosure. This means any ignition of gas inside the sensor housing is contained and cooled, preventing it from igniting the surrounding hazardous atmosphere. This allows the device to be installed directly in Zone 1 areas without requiring expensive intrinsic safety barriers in the control cabinet (though isolators are still recommended for signal conditioning).
- Innovation Point 3: Simple System Integration: The standard 4-20 mA output is the universal language of industrial control. It allows the detector to be easily connected to any existing DCS, PLC, or standalone gas controller with an analog input card, minimizing integration complexity and cost.
