The FIREYE 95DSS2-1CEX is an integrated, microprocessor-based flame scanner designed for industrial combustion systems where you need reliable flame proving and an enclosure suitable for hazardous-area installation. It belongs to the Fireye InSight Type 95DSS2 family, which uses dual sensors (infrared IR and ultraviolet UV) and includes an internal flame relay with adjustable ON/OFF thresholds, so many applications can eliminate a separate remote flame amplifier.
What makes the “-CEX” variant special is the explosionproof / flameproof (Ex d) housing concept that is commonly referenced for CENELEC/ATEX-style hazardous areas. In multiple product listings, the CEX version is described with an Ex d IIC T6 classification and an IP66 enclosure rating, and it is wired via two internal 8-pole terminal blocks rather than a standard external 12-pin quick disconnect.
That combination is exactly what many plants want in classified zones: robust protection, sealed construction, and internal termination designed for secure field wiring.
Why dual IR/UV sensing is useful
Industrial flames are not “one-size-fits-all.” Fuel composition, burner geometry, excess air, furnace temperature, and background radiation can all change the optical signature that a scanner sees. The 95DSS2 platform uses dual IR and UV sensors and determines flame presence by analyzing flame flicker modulation (the natural intensity fluctuation of a real flame) rather than simply measuring brightness. During setup, the scanner selects a modulation frequency that yields the best flame ON/OFF discrimination; S2 models can do this automatically (AutoTune) with manual override, while S1 models rely more on manual selection.
Why “integrated scanner” matters in panel design
Traditional flame systems often use a scanner head plus an amplifier module in the cabinet. The InSight Type 95 concept integrates key functions in the detection head itself, including the flame relay function. That simplifies wiring and reduces cabinet parts count, while still providing the control system with the signals it needs: a discrete flame relay and a fault output, plus (on the broader Type 95 platform) a 4–20 mA signal strength output used for commissioning and diagnostics.
Technical Summary (95DSS2 platform + CEX variant characteristics)
| Item | Specification / Description |
|---|---|
| Product | FIREYE 95DSS2-1CEX Integrated Flame Scanner (InSight I family) |
| Sensor Type | Dual IR & UV sensing (95DSS2 family) |
| Power Requirement | 24 VDC (InSight scanners are 24 VDC powered) |
| Flame Detection Method | Measures flame “flicker” modulation; best ON/OFF discrimination is achieved by selecting an appropriate modulation frequency (AutoTune available on S2 models) |
| Internal Outputs | Internal flame relay with adjustable thresholds; fault relay is part of the Type 95 platform |
| CEX Wiring Style | Two internal 8-pole terminal blocks (instead of 12-pin QD) |
| Hazardous-Area Housing | IP66 enclosure; Ex d IIC T6 hazardous-area style housing is commonly specified for CEX listings |
| Contact Rating (listed) | Max contact rating referenced as 240 VAC in multiple listings |
| Feature Set (95DSS2 family) | 21 modulation frequencies; adjustable gain and thresholds; 4 programmable files; communications capability via PC software is referenced for this scanner family |
How the 95DSS2-1CEX is typically used
1) Hazardous-area combustion supervision
The CEX enclosure is commonly selected for burners in classified areas such as petrochemical units, fuel handling zones, solvent systems, and other environments where explosionproof construction is required by plant standards. Listings describing the 95DSS2-1CEX explicitly position it as an Ex d IIC T6 / IP66 scanner intended for hazardous combustion applications.
2) Multi-burner furnaces where false flame rejection matters
In large furnaces, adjacent burners, hot refractory, or process glow can create strong background radiation. The InSight method of using modulation frequency selection to maximize flame ON/OFF discrimination is intended to improve selectivity under those conditions.
When paired with good sighting practice (clear view of the target flame root and stable mounting), this approach can reduce nuisance trips while still responding correctly to a flame-out condition.
3) Systems that want diagnostics, not just a “yes/no”
On the broader InSight 95DSS2 platform, the scanner family supports operational visibility through a display/keypad and signal strength outputs, and it is commonly referenced with remote communications capability via PC software. That matters because a flame scanner is not only a safety device; it is also an asset-health sensor. Trending flame signal strength over time can reveal dirty optics, misalignment, or burner performance drift before the unit starts tripping unexpectedly.
Commissioning and compliance considerations
One detail that’s easy to overlook: flame safety standards and local codes often constrain response times. In Fireye installation guidance for InSight scanners used with safeguard controls, it is stated that the FFRT (flame failure response time) must be set to no more than 3 seconds to meet compliance with national and local codes in that context.
Even when the scanner is used with a higher-level BMS, you still need to validate overall system response timing (scanner detection + logic + final element shutdown).
For hazardous-area installations, the mechanical side is just as important as the electrical side. Explosionproof integrity depends on correct gland selection, proper tightening, and maintaining enclosure sealing and thread engagement according to the applicable Ex d practices. Product listings for the CEX model also emphasize maintaining enclosure integrity to preserve IP66/Ex performance.
Lifecycle note and sourcing reality
The InSight product family has evolved over time. Fireye’s own product page notes that several InSight I model variants became effectively obsolete and have recommended replacements.
Separately, some distributors explicitly label 95DSS2-1CEX as discontinued/obsolete.
In practical purchasing terms: the part is widely referenced and still appears in channels, but availability may depend on stock, refurbishment, or substitution planning. If your project is new-build rather than maintenance replacement, it’s smart engineering to confirm the approved replacement path early (especially when hazardous-area certification is involved).
Closing perspective
The FIREYE 95DSS2-1CEX is a focused solution for plants that need dual-band (IR/UV) flame detection, an integrated flame relay architecture, and a CEX-style hazardous-area enclosure that is typically described as Ex d IIC T6 with IP66 protection and internal terminal-block wiring.
For maintenance teams, it offers a practical blend of safety function and serviceability; for engineers, it reduces cabinet complexity while supporting more robust discrimination than single-band detectors in difficult furnaces.
