The Rosemount 925FGD Fixed Gas Detector is designed for accurate, real-time detection of combustible hydrocarbon gases in demanding industrial environments. Built around Emerson’s Rosemount 925 Gas Detection Transmitter and Rosemount 625ND Non-Dispersive Infrared Sensor, this fixed gas detection system monitors hydrocarbon gas concentrations from 0–100% LEL to help protect personnel, assets, and process operations.
Engineered for oil and gas production, refining, petrochemical processing, LNG, pipeline operations, power generation, and hazardous material storage areas, the Rosemount 925FGD combines rugged construction with smart sensor technology, digital communication, and flexible mounting options. The detector can be installed as a direct-mount unit or configured for remote sensor mounting using the Rosemount 905 Junction Box, making it suitable for applications where the sensor must be positioned closer to the potential gas source while the transmitter remains accessible for operators.
The Rosemount 925FGD is available with 4–20 mA output, HART® 7 communication, and relay outputs, allowing it to integrate into both modern and legacy safety systems. Its Local Operator Interface displays live readings, alerts, and diagnostic information while supporting calibration and maintenance activities without the need for external tools or handheld communicators.
Westech Industrial supports the Rosemount 925FGD Fixed Gas Detector in BC, Alberta, and Saskatchewan with product selection assistance, application support, lifecycle service, and custom fabrication capabilities. For facilities requiring a more complete fixed gas detection solution, Westech can help with system integration, panel fabrication, mounting considerations, and site-specific support to ensure the detector fits the application and operating environment.
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Description
Non-Dispersive Infrared Combustible Gas Detection
The Rosemount 925FGD uses the Rosemount 625ND Non-Dispersive Infrared Sensor to detect combustible hydrocarbon gases. NDIR technology provides stable %LEL measurement without relying on oxygen for detection, making it well suited for many industrial gas monitoring applications where reliable hydrocarbon leak detection is required.
Smart Sensor Module Design
The Rosemount 625 sensor modules store configuration, calibration, and gas-sensing data directly within the sensor. When a sensor is connected to the transmitter, the Rosemount 925 recognizes the module and communicates digitally with it, simplifying sensor replacement and helping reduce maintenance time in the field.
Local Operator Interface for Easier Field Use
The integrated Local Operator Interface provides real-time gas concentration readings, alert status, and diagnostic information. Operators can complete key calibration and maintenance tasks through the display without opening the unit or relying on additional communication tools, helping simplify routine service activities in hazardous environments.
Flexible Direct or Remote Mounting
The Rosemount 925FGD can be installed with the sensor mounted directly to the transmitter or remotely using the Rosemount 905 Junction Box. Remote mounting is useful when the sensor needs to be placed near a potential leak source while the transmitter remains in a more accessible location for operators and maintenance personnel.
4–20 mA, HART® 7, and Relay Outputs
With 4–20 mA analog output, HART® 7 communication, alarm relays, and fault relay outputs, the Rosemount 925FGD can communicate with a wide range of plant control, safety, and monitoring systems. This allows facilities to incorporate combustible gas detection into existing safety infrastructure while maintaining access to device diagnostics and configuration data.
Built for Harsh Industrial Conditions
The Rosemount 925FGD is built for challenging process environments, with aluminum or stainless steel housing options, NEMA® 4X and IP66 enclosure ratings, and a standard operating temperature range from -40°C to +70°C. The detector is designed for use in demanding industrial settings where vibration, temperature changes, dust, moisture, and hazardous area requirements must be considered.
Fast Response for Combustible Gas Hazards
The Rosemount 925FGD provides fast response times for common hydrocarbon gases including methane, propane, ethylene, n-butane, and ethane. This supports early warning of combustible gas leaks and helps facilities respond quickly to developing safety concerns.
Hazardous Area and Functional Safety Certifications
The Rosemount 925FGD is available with certifications for hazardous area use, including ATEX/UKEX, IECEx, US, and Canadian approvals, with SIL2 functional safety certification available for safety instrumented applications.
Applications
The Rosemount 925FGD Fixed Gas Detector is suitable for combustible gas detection in areas where hydrocarbon gas leaks may create personnel safety risks, fire hazards, process shutdown concerns, or emissions-related issues.
Common applications include oil and gas production sites, compressor stations, well pads, refining facilities, petrochemical plants, LNG operations, pipeline facilities, power generation plants, hazardous material storage areas, loading racks, process units, fuel gas systems, tank farms, and industrial facilities where methane, ethane, propane, butane, ethylene, or similar hydrocarbon gases may be present.
For Canadian industrial sites, the Rosemount 925FGD is particularly useful where fixed gas detection needs to be rugged, serviceable, and easy to integrate into existing safety systems. Westech Industrial can support product selection, site-specific configuration, system integration, and custom-fabricated gas detection solutions for facilities in BC, Alberta, and Saskatchewan.
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