Honeywell 2108B2001N Control Module

Product Information

• Brand: Honeywell Analytics
• Series: Searchpoint Optima Plus
• Model: 2108B2001N
• Type: Infrared point gas detector
• Gas type: Hydrocarbon gases (methane, propane, etc.)
• Detection method: Infrared (IR) absorption technology
• Output: 4–20 mA + optional HART / digital communication
• Power supply: 24 VDC typical industrial supply
• Protection: IP66/IP67 industrial housing (system dependent)
• Certification: ATEX / IECEx hazardous area rated

What it actually is

This device is a gas detection sensor/transmitter, meaning:

• Continuously measures flammable gas concentration in air
• Sends signal to a separate gas control system or PLC/DCS
• Used for safety alarms and shutdown systems

It does NOT:

• Execute control logic ❌
• Act as PLC or controller ❌
• Process automation sequences ❌
• Operate machinery directly ❌

System Role (Simple)

Air in industrial area
→ 2108B2001N gas detector (this unit)
→ gas control panel / transmitter system
→ PLC / DCS / safety system
→ alarms / ventilation / shutdown

So it acts like a “fixed infrared gas sensing head with built-in transmitter.”

Key Features

• Infrared hydrocarbon gas detection (high stability)
• Low maintenance (no catalytic poisoning issues)
• Long-term drift stability
• Fast response time for gas leaks
• Suitable for harsh offshore and refinery environments
• Supports remote diagnostics (HART option in some configurations)

Typical Applications

• Oil & gas production platforms
• Refineries and petrochemical plants
• Gas storage facilities
• Offshore drilling rigs
• Chemical processing plants
• Industrial fire & gas safety systems

Advantages

• High reliability IR sensing (long service life)
• Resistant to sensor poisoning (compared to catalytic types)
• Suitable for hazardous zones (ATEX/IECEx)
• Accurate continuous monitoring of hydrocarbon leaks
• Low calibration drift over time

Important Notes

• Not PLC ❌
• Not control module ❌
• Not relay module ❌
• Not communication module ❌
• It is a fixed infrared hydrocarbon gas detector (field device) ✔
• Requires integration into a gas detection control system

Precautions

• Must be installed in certified hazardous area compliance
• Requires periodic calibration / functional testing
• Must be used with compatible Honeywell gas panel/controller
• Lens must be kept clean for accurate IR detection
• Do not install outside specified temperature range