Spectrex™ 20/20Q Flame Detector

The Spectrex™ SharpEye™ 20/20Q Flame Detector is a QuadSense™ IR3 flame detector designed for fast, reliable hydrocarbon flame detection in commercial, public safety, infrastructure, and industrial applications where hazardous-area approvals are not required. Using four infrared bands between 4 μm and 5 μm, the 20/20Q helps distinguish real flame sources from non-flame background radiation, improving detection reliability while reducing the risk of false alarms.

With detection capabilities up to 150 ft. (45 m) for gasoline and n-heptane fires, a typical response time of less than five seconds, and five selectable sensitivity levels, the 20/20Q provides flexible coverage for a wide range of fire protection applications. Its continuous infrared Built-In Test (BIT) verifies optical and electronic integrity, while multiple output options support integration into standard safety and monitoring systems.

Available through Westech Industrial in Alberta, British Columbia, and Saskatchewan, the Spectrex 20/20Q can be supported by Westech’s technical service team, application knowledge, and custom fabrication capabilities. Westech can assist with detector selection, mounting considerations, control panel integration, and custom fabricated assemblies to support complete flame detection system requirements.

Spectrex™ 20/20Q Flame Detector

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Description

QuadSense IR3 Flame Detection

The 20/20Q uses QuadSense triple infrared technology with four infrared sensors to improve flame recognition and help differentiate real hydrocarbon fires from non-flame background radiation.

Detection Range up to 150 ft.

The detector provides flame detection up to 150 ft. (45 m) for gasoline and n-heptane fires at the highest sensitivity setting, offering reliable coverage for large open areas and high-value assets.

Fast Response Time

With a typical response time of less than five seconds, the 20/20Q supports rapid fire detection and alarm response in applications where early warning is critical.

Proven False Alarm Immunity

The infrared sensing design helps reduce nuisance alarms caused by common background radiation sources, supporting more reliable operation in busy commercial and industrial environments.

Five Selectable Sensitivity Levels

Sensitivity settings from 9.8 ft. to 147.6 ft. allow the detector to be adjusted for different room sizes, equipment layouts, and coverage requirements.

Continuous Built-In Test

The infrared Built-In Test continuously checks the detector’s optics and electronics, helping confirm system integrity during operation.

Multiple Output Options

The 20/20Q supports relay outputs, analog current output, and RS-485 Modbus-compatible communication, making it easier to connect with existing monitoring and control infrastructure.

Durable Enclosure Design

The low-copper aluminum, polyurethane-painted housing is rated IP66, IP68, UL50E Type 4X, and NEMA 250 6P for protection in demanding environments.

Factory-Calibrated for Life

The detector is factory-calibrated for life use, reducing routine calibration requirements and supporting long-term reliability.

Internal Event Logging

An internal log event recorder supports maintenance review and system troubleshooting.

Applications

The Spectrex 20/20Q Flame Detector is well suited for commercial, public infrastructure, transportation, manufacturing, and asset protection environments where reliable optical flame detection is required.

  • Airport terminals
  • Train stations and terminals
  • Storage areas
  • Archives
  • Malls
  • Hospitals
  • Car parking towers and garages
  • Public buildings
  • Banks and offices
  • Historical and cultural sites
  • Aircraft hangars
  • Cable tunnels
  • Automotive parts manufacturing

Documents

Spectrex-20-20q_Datasheet_en_May2026_Westech.pdf

Manufacturer info

Spectrex fire detection products and Open Path Gas Detectors are designed to the highest safety requirements for high risk industries and commercial applications. Fire detection is achieved by the SharpEye 40/40 Series Optical Flame Detectors, including Triple infrared (IR3), Multi IR, UV/IR, UV, IR and CCTV models for Ex hazardous areas and safe area compact Mini designs. SafEye Open Path Gas Detectors monitor distances from <1 meter up to 200 meters with SIL2 high reliability units and duct mount options for turbine / air intake ducts. Spectrex Detectors are SIL2 approved and 3rd party certified to the latest applicable International Standards for Safety, Reliability, Quality and Performance.

https://www.spectrex.net/

SPECS

Product Name:
Spectrex 20/20Q Flame Detector.
Technology:
QuadSense™ triple infrared IR3 flame detection using four infrared bands between 4 μm and 5 μm.
Detection Range:
Up to 150 ft. (45 m) for gasoline and n-heptane fires at the highest sensitivity setting for a 1 ft² / 0.1 m² pan fire.
Additional Detection Ranges (at the highest sensitivity setting for 1 ft² / 0.1 m² pan fire) :
Up to 107 ft. (32 m) for JP5, kerosene, diesel fuel, cooking oil, mineral oil (20W-50), flammable adhesive (flash point < +140 °F [+60 °C]), oil paint, Jet A1, and oil (10W-40); up to 100 ft. (30 m) for ethanol 95%, isopropyl alcohol (IPA), and methanol; 123 ft. (37 m) for butyl acrylate, vinyl acetate, and solvents; 83 ft. (25 m) for polypropylene and ethylene glycol; 57 ft. (17 m) for paper and wood; 17 ft. (5 m) for fireworks.
Additional Detection Ranges (at the highest sensitivity setting for 30-in. (0.75 m) high, 10-in. (0.25 m) wide plume fire):
Up to 107 ft. (32 m) for methane and liquefied petroleum gas (LPG).
Additional Detection Ranges (at the highest sensitivity setting for 1.5 x 1.5-in. (3.8 x 3.8 cm) wide, 4-in. (10 cm) tall fire):
100 ft. (30 m) for gun powder.
Detection Response Time:
Typically less than 5 seconds.
Sensitivity Ranges:
9.8 ft. (3 m), 32.8 ft. (10 m), 65.6 ft. (20 m), 98.4 ft. (30 m), and 147.6 ft. (45 m).
Field of View:
Horizontal 100° at 50% of maximum distance; vertical 95° at 50% of maximum distance.
Operating Voltage:
24 VDC nominal (12 to 32 VDC).
Power Consumption:
Normal operation at 25 mA / 0.6 W at 24 VDC.
Outputs:
Fault relay normally closed, alarm relay normally open, SPST volt-free contacts rated 2 A at 30 VDC; 0–20 mA stepped default configurable current output; RS-485 Modbus-compatible communication link.
Current Output Levels:
Fault less than 1.1 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.
Built-In Test:
Infrared BIT for continuous integrity verification of optics and electronics.
Cable Entries:
1 x M20.
Electrical Interface:
9 terminals and a single cable conduit.
Electrical Input Protection:
According to EN 50130.
Electromagnetic Compatibility:
EMI/RFI protected to EN61000-6-3, EN61000-6-4, EN61000-6-6, and EN 50130.
Temperature Range:
Operating and storage from -40 to +158 °F (-40 to +70 °C).
Humidity:
Non-condensing relative humidity up to 100%.
Enclosure Material:
Low-copper aluminum, polyurethane painted.
Tilt Mount Material:
Stainless steel 316.
Dimensions:
Detector 4.25 x 3.15 x 4.64 in. (108 x 80 x 118 mm).
Weight:
Detector 1.65 lb. (0.75 kg); tilt mount 1.54 lb. (0.7 kg).
Enclosure Ratings:
IP66 and IP68; UL50E Type 4X; EN60529; NEMA 250 6P.
Performance Approvals:
FM3260, EN54-10, and ULC386.
Hazardous Area Approval:
No hazardous area approvals.
Ordering Output Configuration:
Analog 4–20 mA / RS-485 / relays.
Mounting and Accessories:
Tilt mount, stainless steel tilt mount, 2 in. pole mount, 3 in. pole mount, 4 in. pole mount, bracket, USB RS-485 harness kit, air shield, cable, cone viewer, cone of view limiter, and FS-1100 explosion-proof flame simulator.
Available Regions:
Alberta, British Columbia, and Saskatchewan.

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PRODUCT FAQ's

What is the Spectrex 20/20Q Flame Detector used for?
The Spectrex 20/20Q Flame Detector is used to detect hydrocarbon flames in commercial, public infrastructure, transportation, storage, and industrial applications where fast response and reliable false alarm immunity are important.
What detection technology does the 20/20Q use?
The 20/20Q uses QuadSense IR3 flame detection technology with four infrared bands between 4 μm and 5 μm. This helps the detector recognize flame signatures while reducing nuisance alarms from non-flame radiation sources.
What is the maximum detection range of the Spectrex 20/20Q?
The 20/20Q can detect gasoline and n-heptane fires up to 150 ft. (45 m) at the highest sensitivity setting for a 1 ft² / 0.1 m² pan fire. Detection distances vary by fuel type and fire characteristics.
Is the 20/20Q approved for hazardous areas?
No. The 20/20Q listed in the product data has no hazardous area approvals. It does include performance approvals for FM3260, EN54-10, and ULC386.
What outputs are available on the 20/20Q Flame Detector?
The detector supports relay outputs, configurable analog current output, and RS-485 Modbus-compatible communication for integration with monitoring and control systems.
Does the 20/20Q include automatic testing?
Yes. The 20/20Q includes an infrared Built-In Test that continuously verifies the integrity of the detector’s optics and electronics.
Can Westech Industrial support the Spectrex 20/20Q?
Yes. Westech Industrial can support the Spectrex 20/20Q with product selection, application support, service assistance, and integration guidance for flame detection systems.
Can Westech provide custom fabrication for flame detection systems?
Yes. Westech Industrial’s custom fabrication capabilities can support flame detection projects with custom panels, mounting arrangements, system integration, and fabricated assemblies designed around site-specific requirements.