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 flame detector work?
Ultra-Violet (UV) This type of flame detector works by detecting the UV radiation at the point of ignition. Almost entirely all fires emit UV radiations, so in case of the flame, the sensor would become aware of it and produce a series of the pulses that are converted by detector electronics into an alarm output.
Where are UV flame detectors used?
UV/IR flame detectors are used in:
- Hydrogen stations.
- Gas-fueled cookers.
- Industrial heating and drying systems.
- Domestic heating systems.
- Industrial gas turbines.
Can IR sensor detect fire?
IR detectors are sensitive to most hydrocarbon fires (liquids, gases, and solids). Fires such as burning metals, ammonia, hydrogen and sulphur do not emit significant amounts of IR in the detector’s sensitivity range to activate an alarm.
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.
How do I choose a fire detector?
Flame Sensing Technologies Detection instruments should always be selected to suit the requirements of the application which commonly include fuel type(s), fire size, maximum detection range, Field of View limits, fire alarm response time, and potential nuisance or false alarm sources.
What is UV and 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. UV Light.
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.
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.
What is UV flame sensor?
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.
What is ultraviolet flame?
UV flame detectors are sensory devices that are designed to respond to Ultraviolet radiation that has a wavelength that is less than 300nm. The sensor in the device is a photo-tube that includes a cathode and an anode placed in a large P of about 300 volts and sealed in a tube filled with inert gas.
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 benefits of UV/IR flame detection?
Hydrogen and Hydrocarbons flame detection.
How to select a flame detector?
select a flame detector. Defining the requirements for an application is also essential, as such factors as the type of fuel, minimum fire size to be detected, and the configuration of the space to be monitored can influence the choice of instrument. To this end, it is often helpful to set up a
How does UV flame sensor work?
Working Principle. This sensor/detector can be built with an electronic circuit using a receiver like electromagnetic radiation.
How does flame rod detector work?
The detector is mounted outside the combustion chamber. When a flame is present, the detector senses the UV radiation emitted and produces a signal that is sent to the amplifier in the flame safe-guard control. The amplified signal actuates the flame relay, allowing proper operation of the system.