How does flame detector work?
This type of flame detector works by detecting the UV radiation at the instant of ignition. Mostly all fires emit UV radiations, so in case of the flame, the sensor would detect it and creates a series of the pulse which is converted by detector electronics into an alarm output.
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 are the two types of flame detectors?
Two common optical flame detector types are (1) combination ultraviolet/infrared (UV/IR) and (2) multi-spectrum infrared (MSIR). Unlike simple UV or IR detectors, UV/IR and MSIR devices are sensitive to more than one band on the energy spectrum and therefore are less likely to produce a false alarm.
What is Triple IR flame detector?
The Spectrex 40/40I Triple IR (IR3) is a flame detector with a triple spectrum design, manufactured by Spectrex, that is able to detect fuel and gas fires at long distances with the highest immunity to false alarms.
How do you test a flame detector?
– The portable flame sensor test unit should activate the flame detector at a distance of 3m within 20 seconds. – The detectors are fitted with internal IR LED’s that can be activated to optically test the detector. (The above tests apply to detectors at room temperature under normal factory lighting conditions.
How does a flame sensor detect flame?
The sensor is a short length of thin metallic rod that creates a small current of electricity in order to confirm there is fire burning within the furnace. As the gas valve opens to begin the combustion process, the current is sent out from the sensor in order to detect the presence of heat from a flame.
How do you detect a flame?
Principles of Flame Detection Most flame detectors identify flames by so-called optical methods like ultraviolet (UV) and infrared (IR) spectroscopy and visual flame imaging.
What is the most commonly used type of fire alarms?
Ionization smoke detectors
Ionization smoke detectors (the most common in home use) detect the particles in smoke. As smoke passes through the chamber, the particles are ionized. These particles may then be detected by charged plates in the detector. Smoke detectors are also available in combination with a heat detector (Figure 4).
What is the difference between UV and IR 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 many types of flame detectors are there?
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.
How many volts is a flame sensor?
As the heating cycle begins, the furnace control board emits a low current voltage to the flame sensor. This is usually between 40-80 volts AC.
How to detect methanol gas leak detection and activate alarm?
Portable methanol gas (CH4O) detector is applied to detect methanol gas leak detection and activate the alarm. It can test the methanol content accurately by using the electrochemical methanol sensor. The signal stability is good. It has high sensitivity level and provides the functional data with high precision, etc.
What type of flame detector is used in optical flame detection?
The preferred optical flame detector is an ultraviolet sensitive, cold cathode, gas discharge tube, hereinafter generally referred to as a UV tube. A UV tube has cathode and anode elements in a gas filled envelope through which ultraviolet rays are transmitted to the cathode element.
What is the function of the detector circuit on a fuel valve?
The detector circuit provides both an enabling function for the burner fuel valve in the presence of a flame and a lockout function to close the fuel valve in the absence of a flame or on occurrence of an abnormal condition in the detector circuit.
What is a flame detector and burner fuel valve?
A flame detector and burner fuel valve control has an ultraviolet sensitive, cold cathode, gas discharge tube in a DC quench circuit. In the presence of a flame, the circuit generates a pulse signal at a frequency related to the intensity of radiation from the flame.