The Rosemount 936 Open Path Toxic Gas Detector provides continuous open path monitoring for toxic gas hazards, including hydrogen sulfide (H2S) and ammonia (NH3), with detection distance options up to 200 ft. (60 m). Using ultraviolet technology, the Rosemount 936 is designed to detect toxic gas across a defined line of sight, making it well suited for perimeter monitoring, fence line applications, large storage areas, process plants, water treatment facilities, waste management sites, agricultural environments, and other industrial locations where point detection alone may not provide the required coverage.
Built for demanding environments, the Rosemount 936 is engineered to maintain reliable detection even when dust, fog, rain, snow, vibration, or other harsh site conditions may reduce signal strength. Automatic gain control helps maintain accurate detection with up to 95 percent signal obscuration, while heated optics support operation in challenging outdoor conditions. The detector also offers a high-speed response time of less than three seconds, high false alarm immunity, real-time diagnostics, and field configuration through HART or RS-485 Modbus communication.
Available through Westech Industrial in BC, AB, and SK, the Rosemount 936 can be supported as part of a broader toxic gas detection or life safety solution. Westech Industrial can assist with product selection, application review, service support, and custom fabrication requirements such as mounting assemblies, integration into gas detection systems, and site-specific installation support.
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Description
Open Path Toxic Gas Monitoring
The Rosemount 936 provides continuous open path detection for toxic gas hazards, including hydrogen sulfide (H2S), sulfur dioxide (SO2), and ammonia (NH3), depending on the selected receiver configuration. Its line-of-sight detection method helps monitor wider areas where traditional point detectors may not provide sufficient coverage.
Long-Range Detection up to 200 ft.
With multiple transmitter range options, the Rosemount 936 can support detection distances from 17 ft. to 200 ft. (5 m to 60 m). This makes it suitable for perimeter monitoring, fence line coverage, large storage areas, and open industrial spaces where toxic gas may travel across a wider area.
Fast Response Time
The Rosemount 936 delivers accurate, high-speed response in less than three seconds, helping facilities identify toxic gas hazards quickly and support faster safety response in critical environments.
Reliable Performance in Harsh Conditions
Designed for challenging industrial environments, the Rosemount 936 can maintain detection accuracy even when fog, rain, snow, dust, vibration, or signal obscuration are present. Automatic gain control helps support reliable performance with up to 95 percent signal obscuration.
Heated Optics for Outdoor Installations
Heated optics help the detector operate in demanding outdoor conditions where moisture, ice, snow, or changing temperatures may affect optical performance. This makes the Rosemount 936 well suited for exposed industrial sites and harsh weather environments.
High False Alarm Immunity
The Rosemount 936 is engineered for high immunity to false alarms and is not influenced by solar radiation, hydrocarbon flames, or other external infrared radiation sources. This helps reduce nuisance alarms and supports more dependable toxic gas monitoring.
Field Configurable Communication
The detector can be configured in the field using HART or RS-485 Modbus communication. These communication options allow users to review setup, reconfigure settings, check detector status, perform diagnostics, and support troubleshooting.
Built-In Diagnostics and Event Logging
Real-time diagnostics help support ongoing detector health monitoring, while the built-in data logger records up to 100 events for maintenance review, troubleshooting, and operational visibility.
Durable Stainless Steel Construction
The Rosemount 936 features stainless steel 316L construction for the detector, source, and tilt mount. The rugged enclosure is designed for demanding industrial and hazardous area applications.
Hazardous Area and SIL-2 Approvals
The Rosemount 936 is available with hazardous area and safety certifications including ATEX, IECEx, CSA C/US, Republic of Korea, and SIL-2 approval, depending on the selected configuration. InMetro and TR CU / EAC certifications are listed as pending in the product data sheet.
Applications
The Rosemount 936 Open Path Toxic Gas Detector is designed for industrial sites that require reliable toxic gas monitoring across open areas, process zones, fence lines, and harsh outdoor environments. Its open path design makes it especially useful where gas may disperse across a wider space and where continuous area coverage is preferred over relying solely on point detection.
Oil, Gas, and Petrochemical Facilities
The Rosemount 936 can be used in offshore platforms, FPSOs, petrochemical plants, gas filling terminals, gas distribution sites, gas transport facilities, and pipeline applications where toxic gas detection is part of the site’s safety strategy.
Chemical and Industrial Processing
For chemical processing plants and industrial facilities, the Rosemount 936 supports continuous monitoring for toxic gas hazards in areas where H2S, SO2, or NH3 may be present.
Water, Wastewater, and Waste Management
The Rosemount 936 is well suited for water treatment facilities, waste management sites, and other environments where toxic gases may be present in outdoor or process-related areas.
Agriculture, Food and Beverage, and Pharmaceutical Facilities
The detector can also support toxic gas monitoring in agricultural operations, food and beverage processing facilities, pharmaceutical facilities, and other sites where ammonia or other toxic gas hazards may require reliable area monitoring.
Large Storage Areas and Buildings
For large storage areas, buildings, and open industrial spaces, the Rosemount 936 provides long-range line-of-sight monitoring to help detect toxic gas hazards across a defined path.
Manufacturer info
Emerson has boldly transformed itself to create value for our customers and shareholders. With our newly energized focus on our two core business platforms — Automation Solutions and Commercial & Residential Solutions — we can confront the challenges of an increasingly complex and unpredictable marketplace from a position of strength. This allows us to drive both near- and long-term value. And retain our single-trusted-partner status with the process, industrial, commercial and residential industries.
