What is difference between IR and UV flame detector?
What is difference between IR and UV flame detector?
Unlike IR energy emitted by flame, the UV radiation emitted is readily absorbed and attenuated by most hydrocarbon substances existing between the sensing element and the flame – whether airborne like vapour, oil mist, and smoke and certain other chemicals or deposited on surfaces in the optical path of the detector …
How does a UV IR flame detector work?
A UV/IR flame detector consists of ultraviolet (UV) and infrared (IR) sensors that are joined together in a single apparatus. UV sensors work by detecting the UV radiation emitted by the flame and are sensitive to a wide range of flammable fuels including hydrocarbons, sulfur, hydrazine and ammonia.
How do you test a UV flame detector?
Point at the Flame detector within the test range and on the central axis of the cone of vision of the detector. Press the switch and wait until the Flame detector is activated. For IR or UV/IR detectors the switch should be intermittent operated in a 1 second pulse (0.5 sec on, 0.5 sec off).
What is a disadvantage of a combination UV IR fire detector?
The downside is that these detectors detect even sunlight, radiation, arc welding and lightning, and short wave UV cannot penetrate dust, smoke, fuel particles and oil films.
What is UV IR?
Light (also referred to in professional literature as radiation) is best thought of as a spectrum consisting of ultraviolet light (UV) at the short end, visible light in the center, and infrared (IR) wavelengths at the long end.
How does IR sensor work?
Active infrared sensors both emit and detect infrared radiation. Active IR sensors have two parts: a light emitting diode (LED) and a receiver. When an object comes close to the sensor, the infrared light from the LED reflects off of the object and is detected by the receiver.
What is UV and IR?
What is IR flame detector?
Infrared Detection Infrared (IR) flame detectors work within the infrared spectral band. Hot gases emit a specific spectral pattern in the infrared region, which can be sensed with a thermal imaging camera (TIC) a type of thermo graphic camera. False alarms can be caused by other hot surfaces in the area.
How do I choose a flame detector?
Base your device selection on an analysis of the characteristics of potential fires, their causes and the environment. UV detectors offer fast response and good sensitivity while UV/IR and multispectral IR models provide increased false alarm immunity over UV models and operate at moderate response speeds.
Which detect a flaming fire best?
Infrared thermal cameras MWIR infrared (IR) cameras can be used to detect heat and with particular algorithms can detect hot-spots within a scene as well as flames for both detection and prevention of fire and risks of fire.
Can IR sensor detect flame?
The IR-S type infrared flame detector has low-brightness flame detection sensitivity and a wide dynamic range, so that it can be applied to various fuels such as gas, heavy oil, and coal.
Can IR sensor detect fire?
MWIR infrared (IR) cameras can be used to detect heat and with particular algorithms can detect hot-spots within a scene as well as flames for both detection and prevention of fire and risks of fire.
What is a fundamental difference between IR detector and UV-Vis detector?
In general, UV/vis detectors convert a photon of light into an induced current. Conversely, IR detectors use the temperature dependence of resistance of metals to measure a change in temperature as a result of a change in current/potential. (b) Explain the operation of one type of IR detector.
What is the main difference between UV and IR spectroscopy?
UV-Vis spectroscopy uses the ultraviolet and visible regions of the electromagnetic spectrum. Infrared spectroscopy uses the lower-energy infrared part of the spectrum. In UV-Vis spectroscopy, wavelength is usually expressed in nanometers (1 nm = 10-9 m).
How does a UV scanner work?
The UV Scanner detects the ultraviolet radiation emitted by combustion flames. The flame supervision is designed to detect or not to detect a flame. The burner management system makes a decision based on the flame or no flame input from the UV scanner and allows or does not allow fuel flow to feed combustion.
In which environment are ultraviolet flame detectors best suited for use?
UV/IR flame detectors are well suited for both indoor and outdoor use. However, as with UV detectors, alarm detection range may be reduced by the presence of dirt, dust, fog, and heavy smoke.
What are the types of flame detectors?
There are four primary optical flame-sensing technologies in use today: ultraviolet (UV), ultraviolet/infrared (UV/IR), multi-spectrum infrared (MSIR), and visual flame imaging. They are all based on line-of-sight detection of radiation emitted in the UV, visible, and IR spectral bands by flames (see Figure 1).
What are the 4 types of fire detectors?
The four types of fire detectors are heat, optical (ionisation), photoelectric, and ionisation/photoelectric. The differences in each of these are how they detect fires, heat being from temperature, and the other three being from smoke.
Which sensor is suitable to detect fire?
Photoelectric sensors are the least costly and are employed widely in residential and other fire alarms. They comprise a light source, typically an IR LED and a photodetector, usually a photodiode, together with simple signal processing electronics (Figure 1), housed in a plastic enclosure.
Why choose the Dräger flame 1500 flame detector?
The Dräger Flame 1500 flame detector uses its triple IR sensor to detect hydrocarbon fires even at great distances. It offers you high reliability against false alarms.
What is the difference between the Dräger flame 2350 and the 5000?
The Dräger Flame 5000 is an imaging based explosion proof flame detector. This visual flame detection system uses digital image processing and advanced algorithms to process and interpret flame characteristics. This The Dräger Flame 2350 combines UV and IR sensors for the detection of hydrocarbon-based fires.
How far can a Triple IR flame detector detect fire?
The ultra fast triple IR flame detector detects hydrocarbon based fire to distance of up to 90 metres. With its triple IR sensor The Dräger Flame 2500 detects hydrocarbon-based fires even over greater distances. Moreover, it offers a high reliability against false alarms.
Why choose flame detectors for gas detection?
As an ideal solution to the growing demand for flame detectors in industrial applications, they are also increasingly used alongside gas detection equipment as part of a safe solution. That is why we offer a wide range of different and highly specialised flame detectors for a wide variety of fires.