Rosemount 625IR Fixed Gas Detector

Precise hydrocarbon monitoring, featuring heated optics, SIL2 safety certification, and factory calibration for long term accuracy in hazardous environments.

Starting at $4,371.33
Effective April 15th, 2025 Rosemount has added a 6.7% surcharge for all of their products. The surcharge will appear as a separate line item on the order.

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Product Manual Product Specs (2 Files)

Features

  • ±2% full-scale accuracy
  • Dual-band infrared absorption detects hydrocarbon gases up to 100% LEL
  • Factory calibrated with zero drift; no field adjustment required
  • Heated optics ensure stable performance in high-humidity environments
  • SIL2 certified with ATEX, IECEx, and North American explosion-proof approvals
  • Operates from -40° to 167°F with 0 to 99% RH tolerance
  • Continuous self-diagnostics and miswiring protection
  • 316 stainless steel housing rated IP66/IP67 and NEMA 4X
  • 4 to 20 mA, HART, and Modbus RTU outputs

The Rosemount 625IR fixed gas detector provides fast, accurate detection of combustible hydrocarbon gases using dual-band infrared absorption technology. Designed for harsh industrial environments, it continuously monitors gas concentrations up to 100% of the lower explosive limit (LEL) with ±2% full-scale accuracy. Factory calibration eliminates zero drift and removes the need for field calibration, ensuring stable long-term performance.

Built for demanding conditions, the 625IR features heated optics to prevent condensation and maintain measurement integrity in high humidity. It offers continuous self-diagnostics, miswiring protection, and a rugged 316 stainless steel housing rated IP66/IP67 and NEMA 4X. The unit is SIL2-certified and carries ATEX, IECEx, and North American explosion proof approvals, ensuring compliance with global safety standards.

The detector operates reliably from -40° to 167°F and 0 to 99% relative humidity. Outputs include 4 to 20mA analog, HART, and Modbus RTU for flexible system integration. A five-year warranty and 15-year IR source warranty reduce maintenance costs and downtime.

Rosemount 625IR Fixed Gas Detector Applications:

  • Oil and gas facilities (offshore platforms, pipelines, and refineries)
  • Petrochemical and chemical processing plants
  • Power generation and tank storage operations
  • Gas filling, distribution, and transport terminals
  • Any hazardous location with potential hydrocarbon gas leaks