Fireye 45UV5-1000 U.V. Flame Scanner
- Self-check UV scanner
- 1 inch NPT mount,
- 120 VAC 60HZ.
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Fireye 45UV51000 Description
Fireye Type 45UV5 scanners are self-checking, flame sensing devices. When powered by a compatible, self-checking Fireye control, the scanners detect the presence or absence of flames which emitultraviolet radiation (UV). Typical fossil fuels which emit UV include natural gas, propane, methane,butane, kerosene, light petroleum distillates and diesel fuels. For burners firing steam-atomizedoil or pulverized coal, Fireye recommends the use of infrared (IR) scanners. Fireye offers a complete line of infrared scanners best suited for these applications.
Fireye 45UV51000 Application
When used with a Fireye amplifier, the 45UV5 scanner provides flame failure protection on single and multi-burner industrial applications such as electric utility boilers, power boilers and large furnaces or incinerators. The 45UV5 scanner monitors the flame(s) of only one burner. The pilot and main flames may be monitored individually (2 scanners) or in combination (1 scanner). When properly sighted, the scanner should discriminate between the burner being monitored and all other burners and any background flames.
Note: Scanner response is dependent on burner configuration as well as the turbulence and spectral
characteristics of the flames. Application assistance is available on request.
Fireye 45UV51000 Principles of Operation
The 45UV5 scanner employs a detector which is a sealed, gas filled, ultraviolet-transmitting special glass envelope containing two electrodes connected to an AC voltage source. The detector responds only to a portion of the ultraviolet spectrum from common flames. When ultraviolet radiation of sufficient energy (at wavelengths shorter than those in sunlight at the earth’s surface) falls upon the electrodes, electrons are released and the inter-electrode gas becomes conductive. This results in an electric current flow from one electrode to the other. The current flow in the detector starts and ends abruptly and is known as an “avalanche.” A very intense source of UV radiation will produce several thousand avalanches or pulses per second. Less radiation will produce fewer pulses per second. Upon total loss of flame, the detector output ceases except for very infrequent single pulses caused by cosmic rays. The circuitry does not respond to these infrequent pulses. Thus, the presence or absence of pulses is an indication of the presence or absence of flame; the frequency of the pulses is a measure of flame intensity. Pulses generated by the scanner are transmitted to a compatible Fireye control via scanner wiring.
Fireye 45UV51000 Features
The UV tube, quartz lens, power transformer and related electronic components are contained in an aluminum enclosure which is sealed with high temperature oil-resistant gaskets. The quartz lens is a planoconvex type which increases the scanner’s sensitivity up to 400 percent. A hinged mount is provided to permit easy access for cleaning the lens. A double screw-and-keyhole slot arrangement permits quick removal of the housing from its mount. The scanner has a 1″ fitting for mounting to a threaded sight pipe and a 3/8″ threaded connection for purge air. Also included in the Type 45UV5 scanner is an electromagnetic shutter that permits a self-checking circuit within an associated Fireye control to verify that the scanner and signal circuits are producing valid flame presence or absence information. During the shutter closed period the detector’s optical path is blocked from flame radiation. While the shutter is open, flame presence or absence is detected. The resultant scanner output, while flame is detected, is a continuous, periodically interrupted pulsed flame signal. This is a prerequisite for energizing the associated Fireye control’s flame relay.
Fireye 45UV51000 Specifications
Mounting
Models are provided with 1″ female thread mounting, either US NPT or British Whitworth according
to model (see table below).
Housing, Including Mounting Flange
Material: Die Cast Aluminum
Design: Hinged Mounting Flange, with air fitting to be permanently installed, carries two 1/4 – 20 screws which may be loosened for quick removal of the scanner housing, such as for lens cleaning.
Weight: 3.75 lbs. (1.7kg) Electrical
Power Requirement: 4 VA AC from associated Fireye control (see note below).
Frequency: Frequency of scanner must match frequency of Fireye control and power line supply (See Table 1).
Connection: 1/2 inch 14 NPSM tapping.
Temperature Range: Maximum operating: 200F (93C)
Minimum operating: -40F (-40C)
Optical Range: 190 to 250 nanometers. No response to infrared radiation or visible light. Purge Air
Source: Clean ambient
Volume Required: 4 SCFM (113 L/min. @ 4″ water column above furnace pressure minimum) at 3/8 inch threaded housing inlet or 4 SCFM at 1 inch wye fitting in scanner sight pipe. Temperatures near the upper limit of the scanner operating range nd/or use with dirty fuels may require up to 15 SCFM (425 L/min.).