Red Owl Flame Detector

Sierra Monitor's Red Owl flame detectors (3800 Series) are powerful, cost-effective optical flame detectors that can monitor hydrocarbon-based fuel and gas fires at long distances. The Red Owl comes in two models: triple infrared (IR3) and ultraviolet and infrared (UV/IR) technology, with both models enclosed in explosion proof, stainless steel enclosures.

IR3 technology compares three specific infrared wavelength bands and their relative ratios, giving IR3 Red Owl flame detectors the ability to better distinguish between CO2-emitting flames and non-flame IR sources to provide far greater accuracy and minimize false alarms. Using UV/IR technology, the UV/IR Red Owl flame detectors sense radiant energy in the short wave sections of both the ultraviolet and infrared portions of the electromagnetic spectrum. The signals from both sensors are analyzed for frequency, intensity, and duration. Simultaneous detection of radiant energy in both the UV and IR sensors triggers an alarm signal.

The Red Owl has the unique ability to perform continuous self-test to assure proper functionality, removing the need for an external tester. Other features include a heated window to eliminate condensation and icing, HART capabilities for digital communications, low power requirements, and a compact design.

Packaged with the Red Owl flame detector is a companion hand-held remote control. The remote control provides the ability to customize operation parameters of the Red Owl, such as selecting sensitivity levels and the corresponding alarm delay time. In addition to the automatic self-test feature, the remote control can be used for manual, on-demand self-testing.

Red Owl Flame Detector

  • Multiple IR (IR3) Sensor Option - Detect fires up to 215 feet away with false alarm avoidance
  • UV/IR Dual-Sensor Option – Simultaneously detect UV and IR heat signatures for maximum accuracy and reliability
  • Automatic Self-Test - Set a recurring self-testing time frame to ensure continuous operation
  • On-Demand Self-Test - Test sensors at any time using the hand-held remote control, removing the need for an expensive simulator
  • Stainless Steel Enclosure - Durable and certified for hazardous environments
  • False Alarm Prevention - In-built image analysis reduces false alarms
  • User Selected Parameters - Select one of 4 different sensitivity levels and corresponding alarm delay time via remote control
  • Heated Optics - Prevents condensation and icing with a continually heated lens
  • Smart LED Indicator - Grasp operating status at a glance through the intelligent tri-color LED, easily visible through the flame detector's lens
  • Wider Field of View - Supports 100° horizontal and 90° vertical visibility

Specifications for Red Owl

  Fuel Ft/m Fuel Ft/m
Detection Range at Highest Sensitivity  n-Heptane  215/65  n-Heptane  50/15
 Gasoline  215/65  Gasoline  50/15
 Ethanol 95%  135/40  Ethanol 95%  25/7.5
 Propane  100/30  Propane  16/5
 Hydrogen  16/5

Spectral Range

  • IR3 Flame Detector (3800-1)
    • 4.35um ± 300nm (IR sensor 1)
    • 5.0um ± 300nm (IR sensor 2)
    • 3.8um ± 300nm (IR sensor 3)
  • UV/IR Flame Detector (3800-2)
    • 4.35um ± 300nm (IR sensor 1)
    • 5.0um ± 300nm (IR sensor 2)
    • 185 ~ 260nm (UV sensor)

Field of View

  • 100° Horizontal, 90° Vertical

Sensitivity Settings

  • 4 settings selectable via remote control device

Response Time

  • Typically 10 seconds for 1 sq. ft. n-Heptane fire at 100 ft.

Built-In Test

  • Automatic and Manual (automatic checks every 15 minutes and verifies cleanliness of the lens for proper detector operation, electronic circuitry, sensors and can also be performed manually using hand-held remote control)

Heated Optics

  • To eliminate condensation and icing on the window


  • Alarm and Fail Safe Fault SPDT, 5 Amp at 120 VAC or 30 VDC resistive maximum
  • Alarm Time Delay adjustable via remote control device

Analog 0-20 mA (stepped)

  • Fault/Bit Fault: 1.5 mA (+/- 0.2 mA)
  • Normal: 4 mA (+/- 0.2 mA)
  • Warning: 16 mA (+/- 0.2 mA)
  • Alarm: 20 mA (+/- 0.2 mA)
  • Resistance Loop: 800 ohms max


  • Optional HART 7 communications on the 0-20 mA analog current (FSK) - used for maintenance, configuration changes and asset management, available in mA source output wiring options

Status Indicators

  • Visible LED for Alarm and Normal operation, plus
  • Internal LEDs for Power, Alarm, Fault, Run, and Comm status

Electrical Specifications

  • Operating Voltage: 24 VDC nominal (18-32 VDC)
  • Power Consumption:
    • Standby: Max. 90 mA (110 mA with heated window) at 24 VDC
    • Alarm: Max. 115 mA (135 mA with heated window) at 24 VDC
  • Cable Entries: 2 x ¾" - 14 NPT conduits or 2 x M20 x 1.5 mm ISO
  • Wiring: 12-18 AWG (2.5 mm² - 0.3 mm²)
  • Electrical Input Protection: According to MIL - STD = 1275B
  • Electromagnetic Compatibility: EMI/RFI protected to EN61326-3 and EN61000-6-3
  • Electrical Interface: Terminals

Temperature & Humidity Range

  • Operating temperature: -40°F to 176°F (-40°C to 80°C)
  • Storage temperature: -67°F to 185°F (-55°C to 85°C)
  • Relative humidity: 0-99% non-condensing

Mechanical Specifications

  • Materials: 316 Stainless Steel with electro polish finish, heavy duty copper-free aluminum, epoxy enamel finish
  • Mounting: Tilt/Swivel Mount - 316 Stainless Steel with electro polish finish
  • Dimensions (H x W x D): 182.08 mm x 145 mm x 176.20 mm (7.17 in. x 5.71 in. x 6.94 in.)
  • Weight: Max. 7.0 lbs (2.8 Kg) SS, 3.0 lbs (1.3 Kg) Al
  • Environmental Standards: Meets MIL-STD-810C for Humidity, Salt & Fog, Vibration, Mechanical Shock, High Temperature, Low Temperature

Pending Approvals

  • Hazardous Area:
    • FM/CSA Class 1, Div. 1, Groups B, C, D
    • ATEX and IECEx: 2 G Ex d IIC T5 (-40°C to 80°C), IP66
    • CE Mark
  • Performance: FM 3260
  • Reliability: IEC61508 - SIL2

How to Purchase the Red Owl Flame Detector

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