Talentum IR3 Flame Detector

FAQs

What is the detection range of the IR3 flame detector?

The IR3 flame detector has a Class 1 detection range of 25 meters (82 feet) for a 0.1 m² n-heptane fire or 0.25 m² methylated spirit fire. When set to Class 3 sensitivity (low setting), the range is 12 meters (39 feet) for the same fire sizes. The detector can actually detect fires at distances up to 40 meters, but the flame size needs to be proportionally larger at greater distances.

How does the IR3 detector avoid false alarms?

The IR3 uses three infrared sensors that respond to different IR wavelengths, allowing it to discriminate between genuine flames and spurious radiation sources. Advanced signal processing techniques and optical filters specifically prevent false alarms from flickering sunlight, which is a common cause of nuisance alarms in single-wavelength detectors. The multi-spectrum approach provides superior immunity to false triggers.

Can the detector operate when the window is contaminated?

Yes, one of the key advantages of the IR3 detector is its ability to detect flames even when the lens is contaminated. It can operate through layers of oil, dust, water vapor, or ice. While there may be some reduction in sensitivity (typically retaining 75-86% of normal response depending on contamination type), the detector maintains functional flame detection capability. However, regular cleaning is still recommended for optimal performance.

What is the field of view of the detector?

The detector has a conical field of view with a minimum 90° cone. For EN54-10:2002 compliance, viewing angles should be limited to ±30° in all directions from the central axis. The maximum detection distance is achieved when the flame is directly opposite the detector (0° viewing angle), with relative detection distance dropping by approximately 40% as the viewing angle increases to ±45°.

What output options are available?

The detector offers flexible output configurations including: two-wire current signaling (4-20 mA or 8-28 mA), four-wire connection with relay outputs, or low current mode (3-9 mA). It features two programmable relays – RL1 for fire alarm (normally open) and RL2 for fault or pre-alarm indication (normally closed). The output mode can be configured for either latching (step change) or non-latching (proportional) operation using DIL switches.

How is the detector tested?

The detector can be tested in three ways: (1) Automatic self-test – when terminal 3 is connected to terminal 1, the detector performs an internal optical test every 15 minutes; (2) Manual self-test – applying 24 Vdc to the test terminals triggers an internal test that should produce an alarm within seconds; (3) External testing – using the Talentum TT² test unit from up to 6 meters away, or with a live flickering flame source if safe to do so. The automatic self-test is recommended for continuous verification of detector operation.

What types of fires can the IR3 detector identify?

The IR3 responds to infrared wavelengths from 1.0 to 2.7 μm, which are emitted by virtually all fires. This includes hydrocarbon fires (petrol, diesel, kerosene), alcohol fires (ethanol, methylated spirits), solid material fires (wood, paper, coal, cotton), gas fires (propane, butane, natural gas), and even invisible fires such as hydrogen and fluorine. The detector is certified for detecting both yellow flames (hydrocarbon) and clear flames (alcohol-based).

Can multiple detectors be connected together?

Yes, multiple detectors can be connected in parallel using either two-wire or four-wire configurations. In parallel connection, the quiescent current increases with each additional detector, but the alarm current signal remains the same. The wiring diagrams in the user guide show examples of connecting three or more detectors to provide common alarm and fault signals while ensuring that a fault on one detector does not prevent fire detection by other detectors in the zone.

What is the difference between latching and non-latching modes?

In latching mode (factory default), the detector maintains the alarm state once a flame is detected, and the power supply must be interrupted to reset it. This provides a persistent alarm signal even if the flame is extinguished. In non-latching (proportional) mode, the detector only produces an alarm signal while a flame is in view and automatically resets when the flame disappears. Non-latching mode can also provide proportional 4-20 mA or 8-20 mA current output that indicates flame intensity, useful for early warning applications.

What accessories are available for the detector?

Available accessories include: adjustable mounting bracket (07127-00) for precise positioning, stainless steel weather shield (12545-00) for outdoor installations, Talentum TT² test unit (1800-101) for remote functional testing, and air purge kit (12556-00) for environments requiring continuous window cleaning. These accessories enhance installation flexibility and maintenance capabilities in various environmental conditions.