2108B2101 HONEYWELL

The Honeywell 2108B2101 is a model number for the Searchpoint Optima Plus Point Infrared Gas Detector, specifically the hydrocarbon version without the HART communication option. It is an advanced, fixed-point infrared flammable gas detector certified for use in potentially explosive atmospheres. The detector utilizes the principle of dual wavelength infrared absorption to accurately and reliably measure hydrocarbon gas concentrations in the atmosphere.

Product Specifications

• Model Name: Searchpoint Optima Plus (Hydrocarbon Version)

• Detection Principle: Dual Wavelength Point Infrared Absorption

• Target Gas: Hydrocarbon gases and vapors (e.g., Methane, Propane, Ethylene, etc.). Over 100 gas and vapor calibrations are available.

• Measuring Range: $0 \text{ to } 100\% \text{ LEL}$ (Lower Explosive Limit)

• Response Time: Very fast, typically $T_{50} < 3 \text{ seconds}$ and $T_{90} < 4 \text{ seconds}$ (for methane)

• Signal Output: Standard $4 \text{ to } 20 \text{ mA}$ analog output (autosensing sink or source)

• Power Supply: $18 \text{ to } 32 \text{ VDC}$ ($24 \text{ VDC}$ nominal), $< 4.5 \text{ W}$ max consumption

• Housing Material: Robust 316 stainless steel explosion-proof enclosure

• Environmental Protection: IP66 / IP67 rated, offering high resistance to dust and water ingress.

• Operating Temperature Range: Wide range from $-40^\circ \text{C}$ to $+65^\circ \text{C}$

• Safety Certification: Certified for use in hazardous areas (e.g., ATEX, IECEx, UL, FM) and compliant with functional safety standard IEC 61508 up to Safety Integrity Level 2 (SIL 2).

• Diagnostics: Features comprehensive built-in self-diagnostics and fault finding facilities.

Product Advantages

• Fail-to-Safe Operation: Unlike catalytic detectors, the infrared detection principle ensures a fail-to-safe operation, meaning any blockages or faults will typically result in a fault signal, not an undetected failure.

• Immunity to Poisons and Inhibitors: The infrared technology is immune to common catalytic poisons (e.g., silicone, halides) and inhibitors, which degrade the performance of catalytic bead detectors, ensuring long-term stability and reliability.

• Low Maintenance and Cost of Ownership: With no moving parts, self-compensating optics, and immunity to drift, the detector requires significantly less routine maintenance (such as frequent calibration checks) compared to catalytic sensors.

• Fast Response Time: The rapid response time provides the earliest possible warning of a gas leak, allowing for quicker implementation of safety measures.

• Wide Range Detection: It can detect a wide variety of hydrocarbon gases and vapors, including solvents, offering versatility across different industrial environments.

• Condensation Free: Dynamic Heating Control ensures that the optical components remain condensation-free, maintaining measurement accuracy even in rapidly changing environmental conditions.

Important Considerations (Precautions)

• Hazardous Area Certification: The detector must only be installed and operated in accordance with its specific hazardous area certifications (e.g., Zone 1, Zone 2) and within the specified operating temperature range.

• Installation and Wiring: Installation and maintenance should only be performed by suitably qualified personnel. All wiring must comply with local and national electrical codes and standards for hazardous areas.

• Test Gas Use: During usage, some test gases may be hazardous. Outlets from gassing accessories, used for bump testing or calibration, should always exhaust to a safe area.

• Oxygen Level: The product must not be operated in atmospheres with more than $21\%$ oxygen to maintain electrical safety integrity.

• Calibration and Zeroing: Although highly stable, periodic functional gas tests (bump tests) and re-zeroing/calibration procedures are necessary to confirm correct operation and maintain regulatory compliance. This is typically done using a certified Hand-Held Interrogator unit.