Description

The Honeywell 2106B2310 is a high-temperature (HT), explosion-proof catalytic bead gas detector from the Sensepoint product line. It is specifically engineered for the continuous monitoring of combustible gases (Lower Explosive Limit / LEL) in hazardous industrial areas characterized by elevated temperatures up to 150°C (302°F), such as turbine enclosures, drying ovens, and processing plants.

Commercial Availability & Procurement

• Condition: New Original (Factory Sealed)
• Warranty: 12-Month Industrial Warranty
• Lead Time: Typically ships within 1–3 business days from regional safety instrumentation stock.
• Pricing Note: Listed price is indicative of default hardware configurations. Volume discounts are often available for facility-wide gas detection retrofits.

Technical Specifications

Field Experience & Engineering Insights

High-Temperature Catalytic Bead Architecture

Unlike standard catalytic sensors that drift or degrade structurally when exposed to intense heat, the 2106B2310 utilizes a specialized high-temperature pellistor pair. One bead is active (catalyzed to oxidize gas), and the other is a reference element, wired into a Wheatstone bridge circuit.

• Poison Resistance: The sensor elements are specially treated to resist poisoning by silicones, sulfides, and halogenated hydrocarbons, ensuring prolonged operational life in harsh processing environments.
• Enclosure Venting: The sensor should ideally be mounted pointing downward to prevent moisture, dust, or condensation from accumulating over the flame arrestor mesh, which would impede gas diffusion and slow response times (T_{90}).

Installation, Wiring, and Cross-Sensitivity

• Wiring Scheme: This is a standard 3-wire (M20 entry) catalytic sensor architecture. It interfaces directly with central gas monitoring controllers (such as the Honeywell Touchpoint series) or generic transmitter modules using constant-current bridge drive cards.
• Calibration Constraints: Catalytic bead sensors require a steady supply of Oxygen (O_2) to operate accurately, as they depend on the physical combustion of target gases on the active element. Do not install this unit in inert gas environments (like nitrogen-purged vessels); for oxygen-depleted zones, an Infrared (IR) style gas detector must be used instead.
• Cross-Calibration: While factory-calibrated for a specific reference gas (typically Methane), the sensor will respond to most combustible hydrocarbons. When configuring your controller alarms, consult the Honeywell cross-sensitivity charts to apply the correct scaling factor for your plant’s specific target gas.

System Integration & Compatibility Checklist

• Controller Requirements: Requires a compatible industrial gas control panel capable of providing a constant current supply (typically around 200mA) and balancing a standard milivolt-output Wheatstone bridge.
• Accessories: Can be outfitted with weather protection housings, collecting cones (for light gases like Hydrogen), or sample-draw flow caps for duct mounting.
• Thread Alternates: Note: If your local conduit/junction boxes utilize NPT threads instead of Metric, verify if an M20-to-NPT thread adapter is required, or ensure you have the matching variant (e.g., 2106B2311 for alternative sizing options).

Frequently Asked Questions

How often does the 2106B2310 require routine calibration?

For safety-critical applications, Honeywell recommends performing a bump test or calibration verification every 3 to 6 months. In clean environments, this can sometimes be extended, but high-temperature applications often accelerate exposure to airborne particulates, making regular span adjustments essential to counteract minor baseline zero-drifts.

What should I check if the controller flags a “Sensor Fault / Open Bridge” loop status?

Isolate the circuit power and measure the resistance across the sensor leads at the junction box using a digital multimeter. Check the resistance between the common line and both the active and reference elements. An infinite (OL) reading indicates that one of the internal micro-fine platinum wire filaments inside a pellistor bead has fractured due to thermal shock, severe physical vibration, or sensor old age, meaning the head must be replaced.

Can this sensor be hot-swapped while the area is hazardous?

No. The unit must be de-energized or the surrounding environment must be certified as completely gas-free (“hot work permit” cleared) before opening the local junction box or unscrewing the sensor head, as interrupting live electrical contacts can cause an ignition spark.