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Home --> Fire Alarm Systems
20_20 L-LB UV-IR
  • General
  • Feature
  • Specification
The new generation of radiant energy flame detectors, SharpEye 20-20 L & 20-20 LB series, is an improved line of Ultra Violet/Infra Red (UV/IR) optical flame detectors, which combines state-of-the-art technology with existing proven performance equipment. Detection performance is controlled by a microprocessor and is easily adapted to all environments, applications & requirements. The result is a unique and superior flame detector, which provides excellent detection sensitivity with extreme immunity to false alarms. These enhanced models were developed in light of our successful experience in high-speed flame detection technology for both military and commercial industrial applications. Both the 20-20 L & 20-20 LB are self-contained dualsensor flame detectors designed to detect hydrocarbonbased fuel fires and non-organic fires. The flame detector senses energy in the short wave section of both the ultra-violet and infrared portions of the electromagnetic spectrum. The sensor band pass has been carefully selected to ensure the greatest degree of spectral matching to the radiant energy emissions of fire, and the lowest degree of matching to non-fire stimuli. The UV channel incorporates a special logic circuit that eliminates false alarms caused by solar radiation and other non-fire UV sources. The UV channel sensitivity is stabilized over the working temperature range. The IR sensor is sensitive to radiation over the range of 2.5 to 3.0 microns. The IR channel will register a detection signal, at the appropriate level, when the detector’s IR sensor is exposed to radiation on the appropriate frequency range. Only radiation in this range lasting for a preset time and threshold and having an intermittent pattern characteristic to fire will register an alarm signal. The signals from both sensors are analyzed for frequency, intensity and duration. Simultaneous matching of radiant energy in both the UV & IR sensors triggers an alarm signal. In addition to the basic alarm evaluation circuit, the SharpEye 20-20 LB Flame Detector
• UV/IR dual-sensor • High-speed response • Multiple detection levels • 20 msec response to saturated signal • Immune to false alarms (solar blind) • 90°/90° cone of vision • User-programmable configuration • Standard 4-wire connection • 4-20mA output (source) • FM, Cenelec/ATEX Approved • MTBF minimum 100,000 hours • Unitized - no separate controller required
mechanical Dimensions: 120 x 132 x 132 mm Weight: Aluminium: 3.7 Kg Base 1.7Kg Spectral response: UV: 0.185-0.260 microns IR: 2.5-3 microns Detection range: 1 sq.ft. gasoline fire @ 50 ft. 1 sq. ft. n-heptane fire @ 50 ft. 1 sq. ft. diesel oil fire @ 37 ft. 1 sq. ft. 95% alcohol fire @ 37 ft. Response time: Typical 3 seconds for a 1sq.ft. gasoline pan fire. Time delay: Adjustable time delay up to 30 seconds. Field of view: 90°horizontal, 90° vertical. Built-in-test: Manual & automatic BIT in model 20-20 LB only. Temperature range: Operating -40°F - 160°F Storage -65°F - 185°F Humidity: Relative humidity of up to 95% for the operational temperature. electrical Operating voltage 18-32 Vdc Power consumption Standby Max. 100 mA Alarm Max. 125 mA Electrical connection: Standard two ¾” 14 NPT cable entries. Optional two M25 x 1.5 cable entries. Electrical input protection: Complete electrical interface protection against reversed polarity voltage, surges, and spikes according to MIL-STD-1275. Electromagnetic compatibility: The detector is designed and approved according to the following EMC requirements: Electrostatic discharge IEC801-2: 1984 Conducted emission EN55022 Class A Radiated emission EN55022 Class A Radiated Immunity IEC801-3: 1984 EFT/B IEC801-4: 1988 Outputs: *Dry contact relays: Alarm: 2 Amps @ 30 Vdc 0.5 Amps @ 250 Vac Accessory: 5 Amps @ 30 Vdc & 250 Vac Fault: 5 Amps @ 30 Vdc & 250 Vac * 4-20 mA current output: The 4-20mA is source. Fault: 0 ± 0.5 mA Normal: 4 mA ± 5% IR detection: 8 mA ± 5% UV detection: 12 mA ± 5% Warning: 16 mA ± 5% Alarm: 20 mA ± 5% Resistance loop: 100-600 Ohms