Honeywell 2106B2312 Sensepoint High Temperature Combustible Gas Sensor

The Honeywell 2106B2312, also cataloged as the 2106B2312 High Temperature Combustible Gas Sensor, operates as a dedicated hardware component for detecting and measuring flammable gases under elevated thermal conditions within Honeywell Sensepoint gas detection systems.

Hardware Specifications

Process Control & Gas Detection Loop Integration

The 2106B2312 functions inside specialized process control environments, executing continuous monitoring of potentially explosive atmospheres.

• Catalytic Bead Pellistor Integration: The sensor utilizes matched catalytic beads operating on the Wheatstone bridge principle to measure thermal fluctuations caused by the oxidation of combustible gases.
• 4-20 mA HART Loop and DCS Coordination: When paired with a compatible transmitter, the millivolt bridge output is scaled and converted into a standard 4-20 mA loop protocol. This permits direct integration into Honeywell Experion DCS or local safety shutdown PLCs.
• Integrated Flame Arrestor Protection: An integrated sintered flame arrestor allows target gases to diffuse to the active catalytic elements while preventing any internal ignition from propagating back out into the surrounding hazardous area.

Frequently Asked Questions

• Q: Can the 2106B2312 be wired directly to standard PLC analog input cards?
• A: No. The raw sensor outputs a low-level millivolt bridge signal. It must be connected either to a dedicated bridge-input card or to a compatible transmitter that converts the signal to a standard process loop output.
• Q: How does extreme temperature affect the sensor's calibration span?
• A: Operation at high temperatures (up to 150 deg C) requires the use of thermal compensation loops within the associated transmitter or controller to maintain span and zero stability across the working temperature range.
• Q: Is the catalytic bead resistant to common sensor poisons?
• A: The pellistors are formulated with high-quality, poison-resistant catalysts. However, prolonged exposure to silicones, sulfur compounds, halogenated hydrocarbons, or heavy metals will permanently reduce sensitivity.

Field Installation Guidelines

• Conduit Thread Engagement and Sealing: Thread the sensor directly into the certified junction box or conduit fitting using an approved thread compound. Ensure a minimum thread engagement of five full turns to maintain explosion-proof structural ratings.
• Wiring Shielding and Grounding Continuity: Route the sensor's flying leads through dedicated metallic conduit or shielded, armored instrumentation cable. Terminate the cable shield only at the receiver/controller end to prevent noise from electromagnetic interference (EMI) corrupting the low-voltage sensor bridge.
• Positioning for Gas Density: Always mount the sensor with the sensing element pointing downwards to prevent liquid accumulation. Position the module relative to the target gas properties: mount low for heavy gases (e.g., propane) and high for light gases (e.g., methane).