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Rosemount™ 925 Fixed Gas Detection Transmitter
Rosemount 925 Fixed Gas Detection Transmitter
The Rosemount™ 925 Fixed Gas Detection Transmitter delivers dependable combustible gas detection using proven NDIR technology combined with a smart sensor architecture engineered for long term stability and low maintenance.
Purpose built for fixed combustible gas applications, the Rosemount 925 prioritizes measurement reliability and operational simplicity over feature heavy detector platforms. Its NDIR sensing technology resists poisoning and drift while operating independently of oxygen, making it well suited for harsh and inert environments. Smart sensor design stores calibration and configuration data at the sensor level, reducing commissioning effort and simplifying sensor replacement. With global hazardous area approvals and industry standard integration, the Rosemount 925 supports consistent, scalable deployment—helping safety systems stay online with fewer maintenance touchpoints and lower lifecycle costs.
Rosemount™ 925 Fixed Gas Detection Transmitter

Specs

Accuracy
Gas accuracy: ±3% LEL < 50% LEL and ±5% LEL > 50% LEL
4-20 mA accuracy: ±0.1% of span
Display/Interface
The integral LCD display can display alert state and diagnostic information.
Humidity Range
0-95% relative humidity, non-condensing
Operating Temperature
-40 to +158 °F (-40 to +70 °C)
-67 to +158 °F (-55 to +70 °C) with heater on
Output
4-20 mA with HART® 7 Protocol, Relays
Power Supply
Power supply range: 18 to 30 VDC
Max. power consumption: 4.0 W with heater on
Sensor Type
Rosemount 625 Non-Dispersive Infrared Sensor

Features

  • Proven NDIR Combustible Gas Detection Stable, accurate measurements without the complexity of multi technology platforms
  • NDIR sensing resists poisoning and long term drift
  • Designed specifically for combustible gas detection—not a mixed sensor platform
  • Delivers predictable performance over long operating life
  • Low Maintenance Design That Reduces Total Cost of Ownership Fewer calibrations, fewer service events, fewer touchpoints
  • NDIR technology minimizes routine calibration requirements
  • Reduces ongoing maintenance effort compared to feature heavy IR detector families
  • Ideal for hard to access and maintenance constrained installation

Education

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