Rosemount™ 975 Flame Detector Series

The Rosemount 975 Flame Detector Series is an advanced line of industrial flame detectors designed to identify fire events quickly and reliably in demanding environments. Available through Westech Industrial in BC, AB and SK, the series includes IR3 and UV/IR flame detection options to support a wide range of fire and gas safety applications.

The series includes the Rosemount 975MR Multi-Spectrum Infrared Flame Detector, Rosemount 975UF Ultra Fast Ultraviolet Infrared Hydrogen Flame Detector, Rosemount 975HR Multi-Spectrum Hydrogen Flame Detector and Rosemount 975UR Ultraviolet Infrared Flame Detector. Together, these models provide detection options for hydrocarbon-based fuel and gas fires, hydrogen fires, hydroxyl fires, and select metal and inorganic fire risks, depending on the model selected.

Designed for harsh industrial conditions, the Rosemount 975 Flame Detector Series combines fast response, long-distance detection, false alarm immunity, multiple output options and rugged enclosure choices. Detection performance can also be adapted to different environments, applications and site requirements through configuration parameters, with maintenance and monitoring supported through HART® communication or RS-485-based Modbus® communication.

Westech Industrial can support customers with product selection, application review, service support and integration into broader fire and gas safety systems. For larger projects, Westech’s custom fabrication capabilities and integrated solutions can help support detector mounting, system integration, control panels, shelters and other project-specific requirements.

Rosemount™ 975 Flame Detector Series
Rosemount™ 975 Flame Detector Series - Image 2
Rosemount™ 975 Flame Detector Series - Image 3
Rosemount™ 975 Flame Detector Series - Image 4

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Description

IR3 and UV/IR Detection Options

The Rosemount 975 Flame Detector Series gives facilities multiple detection technologies for different fire risks. The series includes QuadSense™ triple infrared and ultraviolet infrared detection options. As a result, users can select a model based on their fuel type, hazard profile, and application needs.

The IR3 models support long-distance hydrocarbon flame detection in large industrial areas. Meanwhile, the hydrogen-capable IR3 and UV/IR models support applications involving hydrogen and specialized flame hazards. This flexibility helps facilities build a flame detection strategy around real site conditions.

Long-Distance Flame Detection

The Rosemount 975MR and 975HR models detect hydrocarbon-based fuel and gas fires at long distances. At the highest sensitivity setting, each model can detect a 1 ft² gasoline pan fire at up to 300 ft.

This extended range helps improve coverage across tank farms, process areas, and outdoor industrial sites. Additionally, long-distance detection can reduce the number of detectors needed in some applications. That can simplify layout planning while still supporting effective fire protection.

Ultra-Fast Response for Critical Fire Events

The Rosemount 975 Flame Detector Series supports fast response when early fire detection is critical. Each model offers response performance suited to specific fire hazards and application conditions.

The Rosemount 975UF and 975UR UV/IR models can detect fire in under 20 milliseconds in certain flash fire conditions. In addition, the 975MR and 975HR IR3 models provide ultra-fast response for long-distance flame detection. This speed helps operators respond sooner when hazardous conditions develop.

Strong False Alarm Immunity

The series detects flame signatures while helping reduce nuisance alarms. This balance is important in facilities with sunlight, hot equipment, welding, or other potential false alarm sources.

The UV/IR models analyze ultraviolet and infrared signals for frequency, intensity, and duration. Then, the detector triggers an alarm when both sensors confirm radiant energy from a flame event. The UV sensor also uses logic that helps reduce false alarms caused by solar radiation.

Built-In Testing and Field Integrity Support

The series includes smart field-of-view integrity testing and infrared built-in test functionality. These features help validate optical integrity and electronic circuitry during operation.

As a result, maintenance teams gain better visibility into detector health. This can support more confident maintenance planning, especially in harsh or remote locations. Built-in testing also helps facilities maintain reliable flame detection between scheduled service intervals.

Designed for Harsh Industrial Environments

The Rosemount 975 Flame Detector Series is built for demanding outdoor and hazardous-area applications. It offers a broad operating temperature range, heated optics, and rugged enclosure options.

The heated optics help reduce condensation and icing on the detector window. Additionally, water and dust protection supports dependable operation in difficult environments. This makes the series well suited for industrial sites exposed to weather, humidity, dust, and vibration.

Flexible Outputs and Communication

The Rosemount 975 Flame Detector Series offers flexible output and communication options for system integration. Available options include relays, analog voltage, 0–20 mA stepped output, HART® protocol, and RS-485 Modbus® communication.

This flexibility helps facilities connect the detector to existing fire and gas systems. It also supports integration with control systems and monitoring infrastructure. Therefore, the Rosemount 975 Flame Detector can fit many industrial safety system designs.

Rosemount™ 975MR Multi-Spectrum Infrared Flame Detector

The Rosemount 975MR Multi-Spectrum Infrared Flame Detector is designed for long-distance detection of hydrocarbon-based fuel and gas fires in demanding industrial environments. Using QuadSense™ triple infrared technology with four separate IR sensors, the 975MR analyzes multispectral flame signals to deliver reliable detection while maintaining strong immunity to false alarms.

This model is well suited for applications where wide-area coverage and dependable hydrocarbon fire detection are required. At the highest sensitivity setting, the Rosemount 975MR can detect a 1 ft² (0.1 m²) gasoline or N-Heptane pan fire at up to 300 ft. (90 m), helping facilities improve flame detection coverage across large or high-risk areas.

Rosemount™ 975UF Ultra Fast Ultraviolet Infrared Hydrogen Flame Detector

The Rosemount 975UF Ultra Fast Ultraviolet Infrared Hydrogen Flame Detector is designed for applications involving hydrogen, hydroxyl, hydrocarbon-based fuel and gas, metal and inorganic fire hazards. As a UV/IR flame detector, it senses radiant energy in both the ultraviolet and infrared portions of the electromagnetic spectrum, with selectable UV and IR channels that can be used separately or combined.

The 975UF analyzes flame signals for frequency, intensity and duration, with simultaneous UV and IR detection used to trigger an alarm response. This model is especially useful in applications requiring ultra-fast flame detection, with detection capabilities suited to hydrogen and specialty fire risks where fast response and false alarm reduction are critical.

Rosemount™ 975HR Multi-Spectrum Infrared Hydrogen Flame Detector

The Rosemount 975HR Multi-Spectrum Hydrogen Flame Detector is designed for the detection of both hydrocarbon and hydrogen flames. Built on QuadSense™ triple infrared technology, the 975HR provides long-distance flame detection with strong false alarm immunity, making it suitable for industrial sites where hydrogen fire risk must be monitored alongside traditional hydrocarbon hazards.

The 975HR is a strong option for harsh and outdoor environments, with features such as heated optics to help reduce condensation and icing, HART® communication, lower power requirements and a compact, lighter design. At the highest sensitivity setting, it can detect hydrocarbon-based fires at up to 300 ft. (90 m) and hydrogen fires at up to 164 ft. (50 m), depending on the fire type and application conditions.

Rosemount™ 975UR Ultraviolet Infrared Flame Detector

The Rosemount 975UR Ultraviolet Infrared Flame Detector is designed for fast detection of hydrocarbon-based fuel and gas fires. Using UV/IR technology, the detector senses radiant energy in both the ultraviolet and infrared portions of the electromagnetic spectrum, then analyzes the signals for frequency, intensity and duration before triggering an alarm.

The 975UR is suited for applications where fast UV/IR flame detection is required, particularly in industrial environments where hydrocarbon fire risks are present. Its UV sensor includes logic designed to help reduce false alarms caused by solar radiation, supporting dependable flame detection performance in challenging operating conditions.

Applications

The Rosemount 975 Flame Detector Series can be applied across industrial and commercial environments where fast, reliable flame detection is required. Model selection should be based on the fire hazards present, detection distance required, field of view, environmental conditions and integration needs.

Common applications may include:

  • Oil and gas onshore and offshore installations and pipelines
  • Chemical and petrochemical plants
  • Storage tank farms
  • Fuel and gas processing and storage facilities
  • Power generation facilities
  • Explosives and munitions facilities
  • Fertilizer plants
  • Automotive facilities
  • Vehicle battery charging stations
  • Hydroxyl production and storage
  • Aerospace applications
  • Waste management facilities
  • Pharmaceutical facilities
  • Printing operations
  • Warehouses
  • Hazardous materials storage areas
  • Food processing facilities
  • Hydrogenation applications in petroleum refining, food processing and chemical facilities
  • Hydrogen fuel cell industry applications
  • Mining operations

Documents

Rosemount_975 Flame Detectors_Data Sheet_June2026_Westech.pdf

Rosemount_975 Flame Detectors_Manual_June2026_Manual.pdf

Emerson_Rosemount_975_Brochure_Westech_Dec 13, 2019_Westech.pdf

Emerson Net Safety-FGD-BRO-Safety-Monitoring_Westech_June2026.pdf

Manufacturer info

Emerson’s tireless pursuit of innovation drives the Rosemount™ portfolio of superior quality measurement and analytical technologies to provide customers with insight across all touchpoints needed to operate efficiently, safely, and with peace of mind. https://www.emerson.com

SPECS

Product Series:
Rosemount 975 Flame Detector Series.
Models Available Through Westech Industrial:
Rosemount 975MR, Rosemount 975UF, Rosemount 975HR and Rosemount 975UR.
Availability:
BC, AB and SK.
Detection Technologies:
QuadSense™ triple infrared (IR3) and ultraviolet infrared (UV/IR) options.
975MR Detection Type:
QuadSense™ triple infrared (IR3) for hydrocarbon-based fuel and gas fires.
975HR Detection Type:
QuadSense™ triple infrared (IR3) with hydrogen fire detection.
975UF Detection Type:
Ultraviolet infrared (UV/IR) with hydrogen fire detection; designed for hydrocarbon-based fuel and gas, hydroxyl, hydrogen, metal and inorganic fires.
975UR Detection Type:
Ultraviolet infrared (UV/IR) for hydrocarbon-based fuel and gas fires.
Spectral Response - 975MR:
Four infrared bands between 4 μm and 5 μm.
Spectral Response - 975HR:
Four infrared bands between 2 μm and 5 μm.
Spectral Response - 975UF:
Ultraviolet: 0.185 to 0.260 μm; Infrared: 2.5 to 3.0 μm.
Spectral Response - 975UR:
Ultraviolet: 0.185 to 0.260 μm; Infrared: 4.3 to 4.8 μm.
Gasoline and N-Heptane Detection Range (at highest sensitivity for 1 ft² (0.1 m²) pan fire):
975MR and 975HR: up to 300 ft. (90 m); 975UF and 975UR: up to 93 ft. (28 m).
Diesel and Kerosene Detection Range (at highest sensitivity for 1 ft² (0.1 m²) pan fire):
975MR and 975HR: up to 207 ft. (63 m); 975UF and 975UR: up to 70 ft. (21 m).
Hydrogen Detection Range (for a 30 in. (0.75 m) high, 10 in. (0.25 m) wide plume fire):
975HR: up to 164 ft. (50 m); 975UF: up to 70 ft. (21 m); not applicable for 975MR or 975UR.
Detection Response Time - 975MR and 975HR:
Standard response typically less than 2 seconds at 131 ft. (40 m) and 10 seconds at 300 ft. (90 m); ultra-fast response typically less than 1 second at 100 ft. (30 m); high-speed explosion response of 50 ms for 1 ft 90.3 m) diameter sphere LPG/air mixture explosion at 66 ft (20 m) via analog voltage output.
Detection Response Time - 975UF and 975UR;
Standard response typically 5 seconds at 93 ft. (28 m); ultra-fast response of 20 ms for flash fire pan fire from 10 ft. (3 m) via analog voltage output; high-speed explosion response of 50 ms for 1 ft (0.3 m) diameter sphere LPG-air mixture explosion at 32.8 ft (10 m) distance via analog voltage output.
Sensitivity Ranges:
975MR and 975HR: six sensitivity ranges; 975UF and 975UR: three sensitivity ranges.
Field of View - 975MR:
Horizontal: 100°; Vertical: 95°.
Field of View - 975HR:
Hydrogen: Horizontal 90° and Vertical 90°; Other fuels: Horizontal 80° and Vertical 80°.
Field of View - 975UF and 975UR:
Horizontal: 100°; Vertical: 95°.
Operating Temperature:
-76 to +185 °F (-60 to +85 °C).
Storage Temperature:
-76 to +185 °F (-60 to +85 °C).
Humidity:
Non-condensing relative humidity up to 100%.
Operating Voltage:
24 Vdc nominal; 18 to 32 Vdc.
Cable Entries:
2 x ¾-in.-14 NPT conduits or 2 x M25 x 1.5 mm ISO.
Power Consumption - 975MR and 975HR:
Normal without heater: 60 mA, 1.4 W; normal without heater with alarm: 100 mA, 2.2 W; low power mode heater with alarm: 140 mA, 3.4 W; standard power mode heater with alarm: 280 mA, 7.6 W.
Power Consumption - 975UF and 975UR:
Normal without heater: 100 mA, 2.2 W; normal without heater with alarm: 120 mA, 2.9 W; low power mode heater with alarm: 180 mA, 4.3 W; standard power mode heater with alarm: 320 mA, 7.7 W.
Relays:
Alarm, fault and auxiliary relays; SPDT volt-free contacts rated 2 A at 30 Vdc.
Analog Voltage Output:
Analog port malfunction: 0 V below 0.5 V; Normal: 2 V ± 0.3 V; Alarm or explosion: 5 V ± 0.3 V.
0–20 mA Stepped Output:
Fault: 0 ± 1 mA; Built-in test fault: 2 mA ± 0.3 mA; Normal: 4 mA ± 0.3 mA; Warning: 16 mA ± 0.3 mA; Alarm: 20 mA ± 0.3 mA.
Communication:
HART® protocol on the 0–20 analog current and RS-485 Modbus®-compatible communication.
Electrical Input Protection:
According to EN 50130.
Electromagnetic Compatibility:
EMI/RFI protected to EN61000-6-3 and EN 50130; approved to MIL-STD-461, CS114 conducted susceptibility, 10 kHz to 200 MHz.
Electrical Interface:
17 terminals and one wiring option.
Enclosure Options:
Electropolished stainless steel 316 or heavy-duty copper-free aluminum, less than 1%, polyurethane painted.
Mounting:
Electropolished stainless steel 316 tilt mount option.
Dimensions:
Detector: 4 x 4.6 x 6.18 in. (100.6 x 117 x 155 mm).
Weight:
Stainless steel detector: 6.3 lb. (2.9 kg); aluminum detector: 2.8 lb. (1.3 kg); tilt mount: 2.5 lb. (1.1 kg).
Water and Dust Protection:
IP66 and IP68 per EN60529; NEMA® 250 6P.
Environmental Standard:
DNV 2-4.
Product Certifications:
ATEX/IECEx/UKCA Flameproof, USA and Canada Explosion-Proof (Aluminum Enclosure: FM, FMC; Stainless Steel Enclosure: FM, FMC, CSA US/C), INMETRO Flameproof, China Flameproof and CCCF, Technical Regulations Customs Union (EAC) Flameproof.
Available Accessories:
Flame simulators, tilt mount, duct mount assembly, pole mount assemblies, USB RS-485 harness kit, air shield assembly, protective covers and field of view limiter.
Optional Feature:
Enhanced hot CO₂ discrimination available for Rosemount 975MR only.

Related products

PRODUCT FAQ's

What products are included in the Rosemount 975 Flame Detector Series?
The Rosemount 975 Flame Detector Series includes the Rosemount 975MR Multi-Spectrum Infrared Flame Detector, Rosemount 975UF Ultra Fast Ultraviolet Infrared Hydrogen Flame Detector, Rosemount 975HR Multi-Spectrum Hydrogen Flame Detector and Rosemount 975UR Ultraviolet Infrared Flame Detector.
Which Rosemount 975 model should I use for hydrogen flame detection?
For hydrogen flame detection, the Rosemount 975HR and Rosemount 975UF are the hydrogen-capable options in the series. The 975HR is a multi-spectrum IR detector designed for hydrocarbon and hydrogen flames, while the 975UF is a UV/IR detector designed for hydrogen, hydroxyl, hydrocarbon-based fuel and gas, metal and inorganic fires.
What is the difference between the Rosemount 975MR and Rosemount 975UR?
The Rosemount 975MR uses QuadSense™ triple infrared technology for long-distance hydrocarbon flame detection, including gasoline and N-Heptane detection up to 300 ft. (90 m) at the highest sensitivity setting. The Rosemount 975UR uses UV/IR technology for hydrocarbon-based fuel and gas fires and is designed for ultra-fast UV/IR flame detection applications.
Can the Rosemount 975 Flame Detector Series be used outdoors?
Yes. The Rosemount 975 Flame Detector Series is designed for harsh industrial environments, with an operating temperature range of -76 to +185 °F (-60 to +85 °C), non-condensing relative humidity up to 100%, rugged enclosure options, IP66 and IP68 protection, and NEMA® 250 6P protection.
Can the Rosemount 975 Flame Detector Series integrate with existing fire and gas systems?
Yes. The series supports multiple output and communication options, including relays, analog voltage, 0–20 mA stepped output, HART® protocol and RS-485 Modbus® communication. This allows the detector to be integrated with many standard fire and gas monitoring systems and control infrastructures.
How does Westech Industrial support Rosemount 975 Flame Detector projects?
Westech Industrial can help customers in BC, AB and SK select the appropriate Rosemount 975 model based on fire risk, detection distance, environment, field of view and system integration requirements. Westech also provides service support and can assist with broader fire and gas system integration. For project-specific requirements, Westech’s custom fabrication capabilities can support detector mounting, panels, shelters and integrated solutions.
Is the Rosemount 975MR suitable for long-distance hydrocarbon fire detection?
Yes. The Rosemount 975MR is designed for long-distance detection of hydrocarbon-based fuel and gas fires. At the highest sensitivity setting, it can detect a 1 ft² (0.1 m²) gasoline or N-Heptane pan fire at up to 300 ft. (90 m).
Does the Rosemount 975 Series include options for false alarm reduction?
Yes. The series is designed with proven false alarm immunity, model-specific flame signal analysis and built-in testing features. The UV/IR models analyze UV and IR signals for frequency, intensity and duration, while UV sensor logic helps reduce false alarms caused by solar radiation.