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. Depending on the receiver configuration, it detects hydrogen sulfide (H2S), sulfur dioxide (SO2), or ammonia (NH3). This open path gas detector uses line-of-sight monitoring to cover a defined area between the source and receiver. As a result, it can help monitor wider spaces where point detectors may not provide enough coverage.
Long-Range Coverage up to 200 ft.
The Rosemount 936 offers multiple transmitter range options to suit different installation layouts. It can support detection distances from 17 ft. to 200 ft. (5 m to 60 m). Therefore, it works well for fence lines, perimeter monitoring, storage areas, and open industrial spaces. This flexibility helps facilities match detector spacing to site conditions and hazard locations.
Fast Response for Toxic Gas Hazards
The Rosemount 936 delivers a high-speed response in less than three seconds. This fast response helps operators identify toxic gas hazards quickly. In critical environments, faster detection can support timely alarms, investigation, and safety actions.
Reliable Operation in Harsh Environments
Industrial sites often face fog, rain, snow, dust, vibration, and other difficult conditions. However, the Rosemount 936 is designed to maintain reliable detection in challenging environments. Its automatic gain control helps support accurate performance with up to 95 percent signal obscuration. As a result, the detector can continue monitoring even when the optical signal is reduced.
Heated Optics for Outdoor Installations
The Rosemount 936 includes heated optics for demanding outdoor applications. These optics help reduce the impact of moisture, ice, snow, and changing temperatures. Additionally, they help support more dependable operation in exposed industrial locations.
High Immunity to False Alarms
The Rosemount 936 is designed for high false alarm immunity. Its ultraviolet detection method helps reduce interference from solar radiation, hydrocarbon flames, and external infrared radiation sources. Therefore, facilities can improve confidence in alarm conditions and reduce nuisance alarm concerns.
Field Configuration and Diagnostics
Users can configure the Rosemount 936 in the field through HART or RS-485 Modbus communication. These communication options allow users to review setup, adjust settings, check detector status, perform diagnostics, and support troubleshooting. Furthermore, real-time diagnostics help maintenance teams monitor detector health more effectively.
Rugged Stainless Steel Construction
The Rosemount 936 uses stainless steel 316L construction for the detector, source, and tilt mount. This rugged design supports use in harsh industrial and hazardous area environments. Additionally, the enclosure provides IP66 and IP68 protection against water and dust.
Hazardous Area and Safety Certifications
The Rosemount 936 is available with hazardous area and safety certifications, depending on configuration. These include ATEX, IECEx, CSA C/US, Republic of Korea, and SIL-2 approval. 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.
