The Spectrum VIR VI Flame Scanner family offers reliable flame scanning and discrimination for a broad variation of fuels and burner configurations.
The Spectrum VIR VI Flame Scanner family offers reliable flame scanning and discrimination for a broad variation of fuels and burner configurations. This is achieved using an innovative approach to flame scanning. FPS has coupled standard visible (VIR), infrared (IR) and ultraviolet (UV) detectors with Digital Signal Processing (DSP) technology, for significantly enhanced flame detection and discrimination. By analyzing the specific characteristics of the flame spectrum in a particular installation, the Spectrum VIR VI Flame Scanner allows the user much greater flexibility in defining the properties of an acceptable flame.
The Spectrum VIR VI system consists of one or more Scanner Viewing Heads to optically monitor the burner flame, and a Scanner Module central processing unit to analyze the head output signals and report the flame condition. Because flame analysis is separated from flame sensing, we are able to use the same processing module with a suite of Scanner Viewing Head configurations for diverse scanning applications.
The Spectrum VIR flame scanning system consists of four main components: scanner module, scanner head, mounting hardware and scanner rack.
The Spectrum VIR VI scanner
module utilizes a microprocessor to continuously monitor signals from the
viewing heads. Using real-time spectral recognition algorithms and user defined
rules, the scanner module detects the flame condition and provides analog and
digital flame status signals to the boiler control system. Each module has two
independent channels and can monitor two separate viewing heads.
Each module has five available flame output relays (Form A) and two isolated analog outputs. For dual fuel applications, each module has four discrete inputs. These inputs are typically used to switch between preset configurations when a different fuel is selected.
The scanner module is powered by redundant 24VDC supplies to ensure uninterrupted operation, and is backed up by a number of hardware safeties:
- An independent on-board watchdog timer is used to ensure the continuous integrity of the flame scanner system.
- A hard-wired minimum brightness requirement ensures constant "black furnace" protection.
- Any internal fault will result in a no-flame condition.
The scanner head, which is sometimes
referred to as a sensor or detector, is mounted near the burner and positioned
at such an angle so as to maintain a direct sight of the burner flame at all
times. The optimum head location is determined from boiler characteristics and
the relative position of each burner.
The Spectrum VIR VI scanner head has three main configurations that can suit any type of burner and/or fuel:
- Single Color
- Visible (VIS) spectrum.
- Suitable for single burner oil- and coal-fired boilers. - Dual Color
- Visible (VIS) and Infrared (IR) spectrums.
- Suitable for multiple burner oil- and coal-fired boilers. - Tri-Color
- Visible (VIS), Infrared (IR) and ultraviolet (UV) spectrums.
- Suitable for all gas- fired and dual-fuel boilers.
The flame scanner mounting
configuration is based on the design of the boiler and/or burners.
Direct sighted viewing heads are suitable for most applications, particularly on front and opposed wall-fired boilers. This configuration is designed to look straight through the windbox or burner to the target flame. The burner front mount fixes directly to the windbox wall or burner front and is equipped with an integral purge air connection.
Fiber-optic viewing head assemblies are used on installations where it is not always possible to maintain a direct sight on the burner flame. The rigid fiber-optic assembly is used in deep windbox applications to ensure an unobstructed view of the flame. The flexible fiber-optic assembly is designed for use on the tilting burners found on corner-fired boilers. The rugged design allows the assembly to move with the tilting bucket, ensuring a constant sight of the burner flame.
Both fiber-optic styles include a guide tube, facilitating removal of the scanner head for maintenance and cleaning.
Both mounting configurations are supplied with a local junction box which serves as a connection point between the viewing head and the scanner rack. The cable from the junction box to the viewing head is equipped with a quick-disconnect molded connector that mates with the scanner head electronics.
Scanner modules plug into
the scanner rack, providing the necessary termination hardware for wiring to
the viewing heads and the Burner Control System. All external electrical
connections are wired to terminals on the backplane and not directly to
individual scanner modules.
A full-size scanner rack (8-slot) can accommodate up to eight scanner modules and fits in a standard 19" cabinet. This arrangement has the capacity to control up to 16 scanner heads. Also available are half size (4-slot) and quarter size (2-slot) racks for smaller applications.
For networking, RS-485 connectors on the scanner rack permit interconnection of multiple racks and communication between the Windows-based programming terminal and the scanner modules. A common rack fault alarm can be used to notify the user of a module or rack fault.
For more information, please contact us.
