Wireless Monitoring for Combustible Gas Risks

Emerson is releasing an update to its Rosemount 928 Wireless Gas Monitor, introducing combustible gas detection capabilities to the hardware. This update targets the industrial safety ecosystem within chemical processing, oil and gas, and manufacturing facilities, providing a mechanism to monitor remote atmospheric hazards without installing new power cables or signal conduits.

Mitigating Combustible Hazards in Remote Locations
The updated device measures combustible gas concentrations from 0% to 100% of the lower explosive limit (LEL). Transmitting this data over the WirelessHART protocol allows facility operators to gain real-time visibility into atmospheric risks in locations that are logistically impractical to hardwire. By utilizing an existing wireless sensor network, facilities can deploy these monitors to detect early-stage gas leaks before conditions escalate, bypassing the high capital expenditures associated with traditional wired communication infrastructure.

Sensor Technology and Maintenance Mechanisms
Conventional combustible gas detectors frequently rely on catalytic bead sensors, which utilize consumable elements that chemically degrade upon repeated exposure to target gases. The Emerson module avoids these consumable components, utilizing an alternative sensing technology that does not degrade with gas exposure. This engineering mechanism directly extends operational service intervals and reduces the frequency of manual recalibration required by maintenance teams in the field.

System Integration and Network Architecture
Dave Ruhland, global flame and gas product manager at Emerson, noted that facilities can extend their wireless gas detection strategy to include combustible hazards on existing WirelessHART platforms, which simplifies installation and supports reliable monitoring in inaccessible areas. Because the architecture relies on secure WirelessHART communication, the hardware functions autonomously, acting as a discrete monitoring node within a broader industrial safety ecosystem.

Additional Context
This section details technical specifications and competitive benchmarking not included in the original news release.

Industrial combustible gas detection typically relies on either pellistor (catalytic bead) or Non-Dispersive Infrared (NDIR) sensors. Catalytic bead sensors require oxygen to function and are susceptible to poisoning by silicones, lead, or sulfur compounds, which permanently reduces their sensitivity. In contrast, NDIR sensors—which the updated Emerson unit's non-depleting description aligns with—measure gas concentrations by analyzing the absorption of infrared light at specific wavelengths.

When benchmarked against catalytic bead alternatives, NDIR sensors draw slightly more baseline power but offer an extended lifespan of five to ten years compared to the typical two to three years of pellistor sensors. Furthermore, NDIR technology provides a fail-to-safe operational mode, as any optical failure immediately registers as a sensor fault, whereas a poisoned catalytic bead may silently fail to respond to combustible gases during a leak event.

Edited by Aishwarya Mambet, Induportals Editor, with AI assistance.

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