016519 IR3 Flame Detector, explosion-proof
Flame detectors are used to detect open flames indoor and outdoor. They respond to the light emitted from flames during combustion. Flame detectors are especially suitable for smokeless liquid and gas fires not visible for the naked eye as well as for fires of materials that contain carbon with strong smoke emission. Typical areas of application are large industrial warehouses, airplane hangars, chemical facilities, oil refineries, machine rooms, ferries and freight ships, power plants, printing plants, wood warehouses, subway tunnels. Flameproof equipment is contained in an enclosure so strong that an internal explosion will neither damage the enclosure nor be transmitted outside of it. The surface remains cool enough not to ignite the explosive mixture.
 
Functions
Most IR flame sensors respond to 4.3 μm light, emitted by hydrocarbon flames. By responding to 0.75 to 2.7 μm light emissions from fires almost all flickering flames can be detected. The flame detector has three IR sensors. The detector discriminates between flames and other light sources by responding only to particular optical wavelengths and flame flicker frequencies. False alarms due to factors as flickering sunlight are avoided by a combination of filters and signal processing techniques. Low-frequency detection enables the sensor to operate through a layer of oil, dust, water vapour, or ice. An alarm is indicated via increasing supply current consumption (2-wire) or via relay contact (4-wire). The alarm current also illuminates the red LED of the detector.
 
Specifications

Detector (W x H x D)	146 x 150 x 137 mm
Cable gland entries	3 x 20 mm
Terminal functions
1 – 2	Supply in connections or 2-Wire connections +IN and -IN
3 – 4	Remote test input connections +R and -R
5 – 6	Alarm Relay RL1 connections
7 – 8	Fault Relay RL2 connections
Operating voltage	14 to 30 V DC
Current consumption, 2-Wire configuration
Standby	4 mA
Alarm	20 mA
Current consumption, 4-Wire configuration
Standby	8 mA
Alarm	20 mA
Housing material	Copper Free Aluminium Alloy (LM25)
Housing color	Red
Weight	2.5 kg
Protection category (EN 60529)	IP66
ATEX	Ex II 2GD Ex d IIC T4 GbEx tb IIIC T135℃ Db IP66 A21
IECEx	Ex d IIC T4 GbEx tb IIIC T135℃ Db IP66 A21
Permissible operating temperature	-10 to +55°C
Permissible storage temperature	-20 to +65°C
Relative humidity	95%, no condensation
Detection principle	Detection of low frequency (1 to 15 Hz) flickering infrared radiation
Operating wavelength band	0.75 to 2.7 µm
Detection area	90° cone
Sensitivity	High (Class 1 ) and Low (Class 3 )
Range	Class 1: 0.1 m² n-heptane at 25m Class 3: 0.1 m² n-heptane at 12m