Application Scenarios
In a 600MW coal-fired power station, the boiler is periodically switched to oil firing during load ramps and to natural gas during low-demand periods — a true multi-fuel environment where a single-spectrum flame detector would either nuisance-trip on glowing refractory or fail to see a weak gas pilot. By deploying the Fireye 95DSS2E-1 across all 24 burner fronts, the instrumentation team leveraged the module’s UV+IR dual-sensor fusion: the UV channel (295–320nm) instantly captures the sharp UV burst at gas ignition, while the IR channel (700–1700nm) tracks the slower flicker signature of oil and coal flames. During commissioning, the Fireye 95DSS2E-1‘s AutoTune function swept through 21 available flame-flicker frequencies (23–179Hz) and automatically selected the optimal modulation frequency and sensor gain for each burner — slashing the time required for flame setup from days to hours. The built-in flame relay with adjustable ON/OFF thresholds meant that no remote amplifier racks were needed; the Fireye 95DSS2E-1 wired directly into the BMS logic. Within the first six months of operation, the plant recorded zero flame-detection-related spurious burner trips, even during fuel-switching transients that previously generated dozens of false alarms per month. The 8-character LED display and 4-button keypad on the Fireye 95DSS2E-1 allowed technicians to read live flame signal strength and adjust setpoints right at the burner front — no laptop, no software, no scaffold climb with a portable workstation.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | Fireye 95DSS2E-1 (“E” = Enhanced; “-1” = 12-pin quick-disconnect connector) |
| Manufacturer | Fireye (United States) |
| Product Category | Integrated Flame Scanner (UV + IR Dual Sensor) |
| Product Series | InSight Type 95DSS2 (Enhanced S2 Model) |
| Detection Principle | Microprocessor-based; dual solid-state sensors — UV (295–320nm) + IR (700–1700nm) |
| Fuel Suitability | UV: gas & light oil; IR: oil & coal; UV+IR Fusion: mixed-fuel / multi-fuel applications |
| AutoTune Function | Automatic selection of optimal modulation frequency & sensor gain; manual override retained |
| Flame-Flicker Frequencies | 21 selectable frequencies (23–179 Hz) |
| Programmable Profiles | 4 sets (A/B/C/D) for different fuel modes or burner configurations |
| Power Supply | 24 VDC (±10% / -15% tolerance), typical 0.35 A, ~8.5 VA consumption |
| Flame Relay | Internal SPST-NO, adjustable ON/OFF thresholds (eliminates remote amplifier) |
| Fault Relay | Internal SPST-NC, wired in series with flame relay for fail-safe operation |
| Relay Contact Rating | Min: 10mA @ 5VDC; Max: 2A @ 30VDC / 2A @ 240VAC (UL/FM) / 2A @ 50VAC (CE) |
| Analog Output | 4–20mA DC, max load 750Ω (for remote flame intensity monitoring) |
| Self-Check | Fully electronic self-test — no mechanical shutter (removes a common failure point) |
| Response Time | Flame Failure Response Time (FFRT): 1–6s (default 1s, code-compliant) |
| Operator Interface | 8-character alphanumeric LED display + 4-button keypad for on-site configuration |
| Communication | Optional Fireye Explorer PC software via RS485 for remote config & monitoring |
| Electrical Connection | 12-pin 1/4-turn quick-release connector (or 10ft cable for “CG” models) |
| Housing | Cast aluminum, grey polyester powder coat |
| Protection Rating | NEMA 4X / IP66 |
| Operating Temperature | Ambient: -40°C to +65°C; Internal: -40°C to +81°C |
| Humidity | 0%–95% RH, non-condensing |
| Purge Air Requirement | Clean dry air: 4 SCFM (113 L/min) standard; up to 15 SCFM (425 L/min) for high-temp/dusty environments |
| Hazardous Area Certification | Class I Div. 2 (A/B/C/D), Class II Div. 2 (F/G) |
| Safety Certifications | CE, UL/CSA, FM; RoHS compliant |
| Weight | Ambient model ~1.96 kg; CG cable model ~2.89 kg |
| Lifecycle Status | InSight I series marked “Effectively Obsolete” by Fireye (Feb 2020); available as original US stock / new surplus |
Technical Principles and Innovative Values
- Innovation Point 1: UV + IR Dual-Spectrum Fusion for Multi-Fuel Discrimination. The Fireye 95DSS2E-1 integrates two independent solid-state sensors — a UV photodiode responding to 295–320nm (ideal for gas and light-oil ignition flashes) and an IR sensor covering 700–1700nm (ideal for oil and coal flame flicker). By fusing both spectra, the Fireye 95DSS2E-1 distinguishes a real flame from hot refractory, furnace-wall radiation, or welding flash far more reliably than any single-sensor scanner. This capability is especially valuable in mixed-fuel boilers where the dominant combustion spectrum changes with fuel selection.
- Innovation Point 2: AutoTune with 21 Flame-Flicker Frequencies. Every flame has a unique “flicker” signature — the modulated amplitude at which it pulses. The Fireye 95DSS2E-1 can sweep 21 selectable modulation frequencies between 23 and 179 Hz, automatically choosing the one that yields the sharpest ON/OFF discrimination (AutoTune), while still allowing manual override for expert tuning. This adaptive approach directly attacks the root cause of false trips: a poorly matched flicker frequency. Four programmable profiles (A/B/C/D) let the Fireye 95DSS2E-1 store distinct configurations for different fuels or burner modes, enabling instant switching during fuel-change operations.
- Innovation Point 3: Integrated Flame Relay — No Remote Amplifier Required. Traditional flame detection systems require a separate flame amplifier rack to condition the scanner signal and drive relay outputs. The Fireye 95DSS2E-1 eliminates that entire cabinet: the internal SPST-NO flame relay (with adjustable ON/OFF thresholds) and the SPST-NC fault relay (wired in series for fail-safe) connect directly to BMS logic. This integration reduces wiring complexity, cabinet footprint, and — critically — removes a common failure point, increasing overall system reliability.
- Innovation Point 4: Electronic Self-Check Without Mechanical Shutter. Legacy flame scanners rely on a mechanical shutter that periodically interrupts the optical path to prove the detector is alive — a moving part that eventually wears out. The Fireye 95DSS2E-1 uses fully electronic self-checking, with no mechanical shutter required. This solid-state approach dramatically improves mean-time-between-failure (MTBF) and eliminates the maintenance burden of shutter calibration — a decisive advantage for continuous-duty burners that cannot afford unplanned BMS downtime.
- Innovation Point 5: On-Site Configuration Without a Laptop. The Fireye 95DSS2E-1 features an 8-character alphanumeric LED display and a 4-button keypad right on the scanner body. Technicians can view live flame signal strength, scroll through operating parameters, and adjust setpoints directly at the burner front — no software, no laptop, no USB converter. For sites that prefer remote access, the optional Fireye Explorer PC software over RS485 enables full parameter adjustment and monitoring from the control room, with the 4–20mA analog output providing continuous flame-intensity telemetry to the DCS.
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