Phone: +1 (949) 583-1857||Fax: +1 (949) 340-6643

F120 UV/IR Flame Detector

F120 UV/IR Flame Detector Sensor & Controller is a self-contained and explosion proof flame detector that uses the latest state of the art processor and circuitry, detecting both the UV and IR radiations from a flame. Provides rapid detection of flame, while ignoring typical false or nuisance alarms caused by either EMI, lightning, x-rays, gamma radiation, arc welding, reflected sunlight, or discharge light sources. 5 Year Warranty. Made in the U.S.A.

Keywords:  UV/IR, UVIR, UV/IR Flame Detector, Flame Detector, UV Flame Detector, IR Flame Detector

Features and Benefits

  • Explosion-proof flame detector
  • Triple-Mode Detection:  UV/IR, UV only, Dual IR, IR only
  • Solar blind
  • Not blinded by dense smoke
  • Discriminates against Arc Welding Radioactive sources (x-ray), sunlight, lightning, or black body radiation
  • Suitable for use in harsh environments such as offshore platforms and fuel and gas depots
  • Use to monitor and detect fires within a classified area, rooms, hangers, warehouse, turbines, and other high-value manufacturing equipment
  • Flame detector sensors and Control Electronics in self-contained in explosion proof enclosure
  • Designed to work with the NOVA-5000 Control Panel and compatible with other alarm control panels
  • Automatic and Manual Optical Path Checking
  • Automatic Self Test Diagnostics for electronics and sensor elements
  • High current relays for control or shutdown of external equipment.
  • Watertight and corrosion resistant enclosure for use in Hazardous applications Class I Groups B, C, D; Class I Zone I Group IIA, IIB +H2
  • 24 volt DC nominal operating voltage
  • 5 Year Warranty
  • Available flame detector test lamp, Model FT194 Flame Detector Test Equipment





The protection of onshore and offshore hydrocarbon process and handling facilities against any loss from fires requires positive and fast–responding optical flame detectors, with no tolerance for false or nuisance alarms caused by either EMI, lightning, x-rays, gamma radiation, arc welding, reflected sunlight, or any light source such as mercury or quartz iodine flood lights. Traditional UV and UV / IR flame detector sensors can be blinded by precombustion smoke, thus rendering the flame detector useless under these conditions. Also, oil mist or oil deposits on the quartz lens of a UV flame detector or combination UV/IR flame detector will seriously diminish the response to a fire. Therefore, we do not recommend using these types of flame detectors in a hydrocarbon environment.

The SST Model F120 Triple Mode UV / IR optical flame detector uses the latest state of the art processor and circuitry, eliminating the shortcomings of currently available UV/IR flame detectors which are subject to the aforementioned interferences. Outputs are either voted automatically, or can be manually selected by the customer. Selected outputs can either be for UV only, IR only, Temperature, or any two out of three combination. This “voting” capability is what sets this detector apart from any other UV/IR flame detector. This flame detector will see a fire, while other manufacturer’s flame detectors may not. To insure reliable operation, the flame detector is equipped with an automatic Optical Self-Checking feature which continuously checks the optical viewing window for cleanliness and confirms operation of the flame detection circuits.


Physical Description

The Model F120 Flame Detector is self-contained in a two piece explosion proof copper-free aluminum housing finished in a deep red color for rapid identification as a flame detector sensor. A protective coating permits use in harsh environments, such as offshore platforms, without degradation. (An optional stainless steel housing is also available.) The flame detector is suitable for use in “classified” areas where ignitable concentrations of flammable gas normally exist. A sapphire window in the front of the housing permits both ultraviolet and infrared radiation to strike the sensing elements inside. Electrical connections are made through a ¾ inch threaded outlet on the rear of the flame detector sensor, suitable for connection to electrical conduit or a cable gland.

Operational Description

Contained within the Model F120 Flame Detector Sensor Housing are the UV, IR and heat sensing elements and associated electronics, three (3) relays, and screw terminal blocks for wiring. The detector may be installed for completely self-contained operation, utilizing the relays to control local equipment directly. Additionally, the alarm and status conditions may be transmitted by the flame detector to a central control room. The relay contacts, if not being used for local control, may be hard-wired to the control room to transmit these conditions. Or all conditions may be transmitted over a single wire by using the available 0-20 mA signal.

When the detector is installed and operating normally, the green “Ready” light will be visible through the flame detector window. This provides a rapid visual check of flame detector operation. The Model F120 Flame Detector responds to a flame with a variety of criteria and time delay settings. An internal switch sets the flame detector to the most appropriate mode for the exact conditions at your particular installation.

When flame radiation is initially detected, the Alarm Outputs, both relay contact and current loop, are instantly activated. A red Alarm light behind the viewing window in the flame detector is also activated. Should this flame persist for a user selectable period of time, the Delayed Alarm outputs (relay and current loop) will be activated.

Periodically, the Model F120 Flame Detector runs the Automatic Self-Test program. A source of radiation is transmitted to the outside surface of the viewing window, and then passes through the window onto the sensor element. Should the transmission of the window be degraded, or other circuit malfunctions detected, the yellow Malfunction LED in the detector will turn on, the malfunction relay contacts will transfer, and the 0-20 mA output will transmit a malfunction signal. This malfunction indicates a need for maintenance before the performance has been degraded enough to prevent response to flame.

Architect's and Engineer's Specifications

Flame detection capability shall be provided by a triple mode UV / IR flame detector. The detector shall provide a minimum 70 foot on-axis sensitivity to a standard 1 square foot 87 octane unleaded gasoline fire. The detector shall not be susceptible to common false alarm sources such as lightning and arc welding, nor blinded by dense smoke or oil film on the viewing window. The sensor sensitivity response time shall be user selectable.

A comprehensive through the lens self check shall be performed periodically utilizing an integrated test source to verify that the viewing window does not need cleaning. The detector shall provide relay outputs for Alarm, Delayed Alarm, and Malfunction in addition to a 0 to 20 mA current loop capable of reporting the same conditions over a single wire.

All electronics shall be contained in a single user replaceable module which does not require field wiring or unwiring for replacement.

The detector housing shall be waterproof, explosion proof and corrosion resistant. The detector shall be classified as to explosion and fire hazard by Underwriter’s Laboratories, and certified for use in potentially explosive atmospheres per CENELEC requirements. Safety Systems Technology Model F120 Triple-Mode UV/IR Flame Detector Sensor & Controller, or approved equivalent, shall be supplied.

Typical Applications

Typical applications include:

  • Refineries
  • Offshore platforms
  • Heating and coal-fired power plants
  • Industrial manufacturing facilities and assembly lines
  • Airplane and helicopter hangers
  • Chemical storage and chemical production plants
  • LNG and LPG storage and distribution facilities
  • Test laboratories
  • Auto manufacturing plants
  • Tank farm monitoring
  • Fuel stores
  • Pump stations

Technical Specifications and Ordering Information

Technical Specifications

Spectral Response: UV:  185 to 245 nm
IR:  4.3 microns (Hydrocarbon CO2 spike)
Detection Range: Reliably detects a one square foot n-Heptane fire at a distance of 70 feet / 20 m
Response Time: < 5 seconds
Adjustable Time Delay: 3 or 6 seconds
Detection Modes: Standard setting:  UV, IR flicker, Temperature (voted any two out of three sensors)
Custom settings:  UV only, IR flicker only, IR flicker and Temperature
Field of View: 90° Horizontal and 100° Vertical
Optical Self-Test: Automatic continuous optical path
Warranty: 5 years
Approvals: UL, c-UL File E162517
Type 4X Enclosure
Watertight, Corrosion Resistant
For Use in Hazardous Locations
Class I Groups B, C, D
Class I Zone I Group IIA, IIB +H2
Class II Groups E, F, G
Electrical Specifications
Input Power: 20-35 VDC, 125 mA standby, 230 mA alarm @ 24 VDC
Relay Contact Ratings: 2 amps @ 28 VDC or 300 VAC resistive
1/8 HP @ 120/240 VAC
Analog Signal: Standard 0-20 mA, self-powered
Malfunction                0-2 mA
Ready                           4 mA
UV Alarm                    8 mA
Alarm                           12 mA
Delayed Alarm           20 mA
Relay Outputs: Alarm (instantaneous, non-latching);
Delayed Alarm (3 or 6 seconds, latching or non-latching;
Alarm Reset: Automatic or manual when flame is no longer detector
Visual Indicators: Detector Ready (Green LED); Malfunction (Yellow LED); Alarm/Delayed Alarm (Red LED)
Field Connections: 0-20 mA output – three-wire shielded cable
All other connections:  18 AWG (.35mm²) to 14 AWG (2.5mm²)
Wireless Communication: Available with optional wireless transmitter with text, e-mail notification features
Environmental Specifications
Operating Temperature: -40°F to 185°F (-40°C to 85°C)
Operating Humidity: Alarm (instantaneous, non-latching);
Delayed Alarm (3 or 6 seconds, latching or non-latching;
Operating Humidity: Alarm (instantaneous, non-latching);
Delayed Alarm (3 or 6 seconds, latching or non-latching;
Ingress Protection: IP66
Mechanical Specifications
Dimensions: 4.40 x 5.25 inches (112 x 133mm)
Weight: 4.0 lbs (1.8 kg) Aluminum;
10.0 lbs (4.5 kg) Stainless Steel
Housing: Aluminum or Stainless Steel 316

Ordering Information

120-01 Model F120 UV / IR Flame Detector Sensor / Controller with 0-20 mA and Relay Outputs, red aluminum housing
120-01-SS Model F120 UV / IR Flame Detector Sensor/ Controller with 0-20 mA and Relay Outputs, stainless steel housing
190-01 Swivel Mount Assembly for use with 3/4 inch conduit
191-01 Wall mount swivel bracket
194-1 Portable UV / IR Flame Detector Test Lamp with 120 volt battery charger
194-2 Portable UV / IR Flame Detector Test Lamp with standard D cell batteries
194-3 Portable UV / IR Flame Detector Test Lamp with 240 volt battery charger