The 20-20 R SharpEye Single-IR Optical Flame detector
incorporates the advanced flame analysis algorithms
employed in the SharpEye line of UV/IR and IR3 optical
flame detectors, combined with a cost effective electromechanical
design to produce a low-cost flame detector.
The 20-20 R flame detector was designed to provide
early warning of flaming fires involving organic
(hydrocarbon fuels & vapors) materials. These fires emit
strong IR radiation in the 4.4 micron spectral band
where the CO2 (main combustion product of any organic
substance) has a unique spectral peak.
The detector contains an infrared sensor & optical filter
that provides maximum sensitivity to the CO2 emission
spectral band at 4.4 microns and improved immunity to
false alarms caused by environmental IR emitting sources, including sunlight & IR projectors.
The detector was designed to withstand ldquo;harsh”
environmental conditions, including extreme
temperatures, high humidity, vibrations, etc.
Most single band IR detectors are based on pyro-electric
sensors with a 4.4 micron optical filter, and a low
frequency (1-10 Hz) electronic band pass filter
(characteristic of a flickering flame). This type of
detector identifies a fire when the IR radiation emitted
from a 1 sq. ft. gasoline pan fire at 4.4 microns from a
distance of 50 ft. (15m) is above a predetermined value.
• Automatic & manual built-in-test
• Enlarged field of view 90°H./90°V
• Immune to false alarms
• CENELEC/ATEX approved
• MTBF minimum 100,000 hours
• 4-20 mA & RS-485 interface
• Stainless steel option
Dimensions: 220 x 132 x 132 mm
Weight: Aluminium: 3.5 Kg
Spectral response: Single IR band.
IR: 2.5-3 microns.
Detection range: 1 sq.ft. gasoline fire @ 15m*
1 sq.ft. diesel oil fire @ 7.5m*
1 sq.ft. n-heptane fire @ 15m*
1 sq.ft. 95% alcohol fire @ 10m*
1 sq.ft. JP4 fire @ 10m*
* Highest sensitivity setting.
Response time: Max. 10 seconds. Adjustable
time delay up to 30 seconds.
Two sensitivity ranges: 1 - 15 ft. (5m)
2 - 50 ft. (15m)
Field of view: 90° horizontal, 90° vertical.
Built-in-test: Manual & automatic BIT.
Operating: - 40°F to 160°F
Storage: - 65°F to 185°F
Humidity: Relative humidity of up to 95%
for the operational
Operating voltage: 18-32 Vdc
Power consumption: Max. 70mA in stand-by
Max. 130mA in alarm
Two standard ¾” 14 NPT cable entries. Optional
two M25 x 1.5 cable entries.
Electric input protection:
Complete electrical interface protection
against reversed polarity voltages, surges,
and spike according to MIL-STD-1275.
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
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 sink and can be supplied as source.
Fault: 0 ± 0.5mA
Normal: 5 ± 0.5mA
Warning: 10 ± 1mA
Alarm: 15 ± 1mA
Resistance loop: 100-600 Ohms
The detector is equipped with an RS-485
communication link that can be used in
installations with computerized controllers.