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Home --> Fire Alarm Systems
20_20 U-UB
  • General
  • Feature
  • Specification
The SharpEye 20-20 U & 20-20 UB flame detectors offer improved ultra violet (UV) optical sensors created from Spectrex’s continued commitment to R & D. This stateof- the-art design combines industry performance requirements and up-to-date electronic microprocessor technology. The UV sensor band pass has been carefully selected to ensure the greatest degree of spectral matching to the radiant energy emissions of fire. Flame is detected typically within 3 sec. for a 1 sq. ft. pan gasoline fire. A unique fast UV flame detector model (20-20 FU) detects within several milliseconds a saturated UV signal caused by an explosion or a large fire. The microprocessor design allows for unique field programmability by easy dip switch and makes these flame detectors easily adaptable to all environments, applications & requirements. Multiple detection levels allow for pre-alarm & alarm response. Both detectors now offer programmable time delay of up to 30 seconds. The SharpEye UV flame detector incorporates a special logic circuit that helps prevent false alarms caused by solar radiation. The UV sensor is sensitive to radiation over the range of 0.185-0.260 microns. This combination of sensor & Spectrex’s detection logic will sense, analyze & distinguish between a fire event & a false alarm stimulus. It is important to note that this detector must not be exposed to UV radiation sources such as: electrical arcs, sparks & welding etc.
• UV Spectrum design • Explosion proof • Typical 3-second response • 4-20mA output (source) • Multiple detection levels - pre-alarm & alarm • 90°/90° cone of vision • Standard 4-wire connection • Adjustable time delay • MTBF minimum 100,000 hours • FM, CENELEC/ATEX approved options • Unitized - no separate controller required
mechanical Dimensions: 120 x 132 x 132 mm Weight: Aluminium 3.7Kg Base 1.7 Kg Spectral response: UV: 0.185 - 0.260 microns Detection range: 1 sq. ft. gasoline fire @ 50 ft. 1 sq. ft. diesel oil fire @ 37 ft. 1 sq. ft. alcohol fire @ 37 ft. 1 sq. ft. n-heptane fire @ 50 ft. Response time: Typical 3 seconds for a 1 sq. ft. gasoline fire. Time delay: Adjustable time delay up to 30 seconds. Field of view: 90° horizontal, 90° vertical. Temperature range: Operating: -40°F to 160°F Storage: -65°F to 185°F Humidity: Relative humiditiy of upto 95% for the operational temperature electrical Operating voltage: 18-32 Vdc Power consumption: Max. 80 mA in standby Max. 120 mA in alarm 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 voltages, 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% Warning: 16 mA ± 5% Alarm: 20 mA ± 5% Resistance loop: 100 - 600 Ohms