The Uvisor™ SF910i Integrated SafeFlame Scanner is an advanced instrument designed for reliable flame detection and analysis in combustion systems, forming a crucial part of a boiler or furnace safety system. Its primary function is to identify potentially dangerous "Flame-Out" conditions on both ignition and main flames. The SF910i boasts an "Integrated" architecture, meaning all electronics, from the sensor(s) to the wiring terminals (or quick-release connector), including the processing unit, relays, and communication ports, are contained within the scanner enclosure. This integrated design offers several advantages over conventional split architectures, such as a reduced part count, lower system and installation costs, no need for dedicated control room cabinets, reduced cabling, and a more efficient use of natural resources.
Function Description:
The SF910i digitizes the flame signal 2,000 times per second, using proprietary analysis algorithms to measure flame characteristics. It can be configured to detect flames based on various parameters and operating modes, including Corner, Wall/Industrial, Lighter, and Turbine applications. The device offers both Line Of Sight (LOS) for direct flame view and Fiber Optic Cable (FOC) for indirect flame view through an optical cable, accommodating different burner arrangements and fuel types. The SF910i can be equipped with diverse sensor types, including IR (Infrared), UV (Ultraviolet), UVIR (UV IR Dual Sensor), and PYR (Dual IR Sensor), with the PYR version enabling real-time flame temperature measurement.
For dual sensor modules, an "Alternative Flame Logic" allows configuring the unit to vote flame conditions by calculating an OR or an AND of the flame condition detected independently by the two sources. The SF910i also features a continuous self-check on the incoming flame signal(s) to prevent electrical values inconsistent with a "real" flame from being processed, thus ensuring safe operation. It can detect frequency values that are too stable to be generated by a flame, indicating potential electrical noise or a fault in the sensor electronics.
Important Technical Specifications:
- Optical Spectrum:
- IR versions: 320 - 1100 nm peak sensitivity @ 920 nm
- UV versions: 210 - 360 nm peak sensitivity @ 280 nm
- UVIR versions: Combination of above IR and UV sensitivities
- PYR: Dual colors IR
- Optical Sensor Technology:
- IR versions: Si photodiode
- UV versions: SiC photodiode
- UVIR versions: One Si and one SiC photodiodes
- PYR: Si Photodiode
- Power Supply: 24VDC (-25%, +20% = 18 - 29VDC)
- Power Consumption: 3.6W typical, 4W maximum
- Inrush Current: 6A peak and 2ms settling time
- Relays: Two relays (Flame-relay and Safe-relay), 1 NO contact each.
- Flame-relay: 50 VAC / 1.5A, 48 VDC / 300 mA, 30 VDC / 1.5A. Minimum load 10mA, 5VDC.
- Flame-relay drop-out time: 0.2s to 4.0s (configurable), 2s default.
- Flame-relay pull-in time: 0.2s to 10s (configurable), 2s default.
- Analog Output (4-20mA): Galvanically isolated, R load <= 500. Outputs Intensity, Flicker-Frequency, AC-Amplitude, Quality, Core Temperature, or Flame Temperature.
- Communication Ports: One RS-485 serial channel, configurable in MODBUS protocols (9600, 19200, 38400, or 115200 baud).
- Local Configuration Interface: 4 touch-buttons (UP, DOWN, LEFT, RIGHT) and LCD display.
- Air Flow for Lens Cleaning:
- LOS versions: 115 l/min (4 SCFM), up to 400 l/min (14 SCFM) for excessive contaminants.
- FOC versions: 400 l/min (14 SCFM).
- Minimum Cleaning Air Pressure:
- LOS versions: 20mm H2O (1” W.C.) above maximum wind box pressure.
- FOC versions: 400mm H2O (12” W.C.) above maximum wind box pressure.
- Maximum Fiber Optic Continuous Operating Temperature: Quartz fiber: 350°C (662°F), Glass fiber: 482°C (900°F).
- Mounting Thread: 1” NPT male.
- Cable Entry Thread: ¾” NPT female (N/A for connectorized versions).
- Enclosure Earth Connection: Standard yellow-green earth cable, 4mm2 minimum section, 3m maximum length.
- Dimensions: Diameter 95 mm, overall length 180mm approximately.
- Weight: 1.3 Kg approximately.
- Degree of Protection: IP66/IP67 (CEI EN 60529).
- Corrosion Resistance: Aluminum alloy coated with Epoxy Polyester Powder (minimum 60µm, maximum 200 µm, typical 100 µm). INOX versions AISI 316L available.
- Ambient Operating Temperature: -40° to 70°C (-40° to 158°F). LCD may be blank below -20°C, but safety relay function remains operational.
- Ambient Storage and Transportation Temperature: -40°C/85°C (-40°F/185°F).
- Relative Humidity: 5 - 95% non-condensing.
- Vibration Sinusoidal Operating: 5 - 200 Hz, 20m/s2 peak (2 G), 0.15 mm peak displacement.
- Shock Operating: 15G, 11 ms duration (half sine wave), three shocks in each direction (six pulses in each axis).
Usage Features:
- Ease of Installation and Configuration: The SF910i is designed for straightforward installation and configuration, supported by the Flame Explorer™ software tool.
- Local and Remote Configuration: Configuration can be done locally using the touch-buttons and LCD display (with the cover open in non-hazardous areas, or through the glass in hazardous areas) or remotely via the Flame Explorer software connected through the serial communication line (MODBUS).
- Operational Modes:
- First-time Power-up Mode: Prevents flame-relay from energizing until configured, indicated by a slow blinking red flame LED.
- Normal-Mode: Provides real-time display of operating values (Intensity, Flicker-Frequency, AC-Amplitude, Quality, Flame Temperature) in bar-type, numeric, or combined formats.
- Configuration-Mode: Allows changing SF910i unit and relay settings.
- Program-Mode: Provides specific Flame Scanner tuning values for response times and limits (e.g., Trip Points, Quality Normalization, Frequency Sensitivity, Smoothing, Delay Drop-Out, Flame Pick-Up, Maximum Frequency).
- Display Features: LCD display for measured values, current faults, fault history, tuning information, and version details. Three LEDs (Power, Safe, Flame) provide visual feedback on the unit's status.
- Relay Assignment: The main flame relay is always assigned as Flame-relay. The second relay (Safe-relay) is configurable for various purposes, including a second flame relay, watchdog, flame quality relay, or scanner case skin temperature relay.
- Flame Temperature Measurement (PYR versions): Allows configuration of flame temperature calculation average, scale (Celsius or Fahrenheit), and relay threshold.
- Smoothing Filters: Algorithms to smooth variations in measured values, providing more consistent signals for analysis and allowing for more sensitive trip points.
- Time Delays: Programmable Delay Drop-Out (0.2 to 4.0s) and Flame Pick-Up (0.1 to 10.0s) to ride through transient events and ensure proper fuel-supply-valve operation.
- Fuel/Load Switching: Feature to adjust trip, sensitivity, and time-delay settings for different fuels or load conditions.
- Cyber Security: Emphasizes physical access control, specific button combinations for interaction, sealed internal boards, secure Modbus communication, and trusted Modbus hosts to protect against unauthorized access or attack.
Maintenance Features:
- Periodic Cleaning: Regular removal of ashes, carbon particles, and other dusts/oils from the external surface of the enclosure to ensure efficient thermal dissipation.
- Lens Cleaning: For LOS versions, cleaning the scanner lens using degreaser liquid (no abrasive tools) if purging air is not clean or the system is non-working.
- Fiber Optic Maintenance: For FOC versions, the fiber optic assembly can be disassembled for replacement, cleaning, or re-alignment of focal distances. This involves removing the inner assembly, detaching the fiber optic bundle, and cleaning the lens.
- Self-Test Capabilities: SF910i has powerful self-test capabilities, but a small number of non-safety-related failures (display, LEDs, 4-20mA output, communication line) may not be automatically detected.
- Periodic Inspection: A periodic inspection (e.g., annually) is recommended for non-safety-related failures.
- Whole Unit Replacement: Procedures for replacing the entire SF910i unit, including configuring the new unit to match the old one's settings.
- Fiber Optic Replacement: Detailed steps for replacing the fiber optic bundle, including securing it within the lens barrel.
- Safety Instructions: All repair/replacement operations must be executed by trained and authorized personnel, adhering to safety warnings regarding dangerous voltages, operating temperatures, and explosive atmospheres.
- End of Product Life Cycle: Manufactured using materials that do not require special treatments and does not contain radioactive materials or batteries. Disposal should follow local regulations.
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