Description
The Fireye 95UVS1E-1CEX is a high-performance, integrated UV (Ultraviolet) flame scanner from the InSight II series. This model is specifically designed for industrial burners to detect the presence or absence of a flame and provide high-fidelity flame signals to a Burner Management System (BMS). The “CEX” designation indicates that this unit is housed in an ATEX/IECEx certified explosion-proof enclosure, making it suitable for hazardous locations commonly found in refineries and chemical plants.
Availability and Procurement
- Condition: New Original (Factory Sealed) or New Surplus.
- Warranty: 12-month standard industrial warranty.
- Lead Time: Typically ships within 1–3 business days from stock.
- Pricing: Subject to current market demand for combustion safety components; contact our sales team for a formal quote.
Technical Specifications
The InSight II series is known for its ability to discriminate between the target flame and background radiation or adjacent burner flames.
| Parameter | Specification |
| Sensor Type | Ultraviolet (UV) |
| Operating Voltage | 24 V DC (+/- 10%) |
| Output Signals | 4–20 mA (Flame Intensity) and Fault/Flame Relays |
| Hazardous Area Rating | ATEX/IECEx Ex d IIC T6 (Explosion-proof) |
| Housing Material | Aluminum (Optional Stainless Steel available) |
| Internal Memory | Stores 2 independent files (user-programmable) |
| Communication | Modbus RTU via RS-485 |
| Ambient Temp | -40 °C to +65 °C (-40 °F to +150 °F) |
Core Functionality and Features
1. Integrated Design
Unlike older systems that require a separate amplifier in a control cabinet, the 95UVS1E-1CEX contains all the detection and processing electronics within the scanner head itself. This reduces wiring complexity and minimizes signal degradation over long distances.
2. Advanced Flame Discrimination
The InSight II utilizes sophisticated algorithms to distinguish the “target” flame from background “hot” refractory or the “flicker” of an adjacent burner. This is achieved through adjustable sensitivity and frequency filters, which can be tuned using Fireye’s Windows-based software (Explorer) or the 95DIS display.
3. Dual Programming Files
The scanner can store two separate sets of operating parameters. This is particularly useful for burners that use different fuels (e.g., switching from Natural Gas to Fuel Oil), as the scanner can switch profiles on-the-fly to maintain optimal detection for each fuel’s specific spectral characteristics.
Engineering Insights: Deployment and Best Practices
As a combustion systems engineer, I recommend the following for the 95UVS1E-1CEX:
1. Sight Pipe Alignment
The scanner must have a clear, unobstructed “line of sight” to the first 30% of the flame (the high-intensity ignition zone).
- Best Practice: Ensure the sight pipe is as short as possible. Use a swivel mount to fine-tune the alignment while the burner is firing to maximize the 4–20 mA intensity signal.
2. Cooling and Purge Air
UV sensors are sensitive to heat and the buildup of soot/dirt on the lens.
- Requirement: Constant purge air is mandatory. It keeps the lens clean and provides essential cooling for the internal electronics. If the purge air fails, the internal temperature of the 95UVS1E will rise rapidly, potentially causing a nuisance trip or permanent sensor damage.
3. Wiring and Shielding
Because the unit outputs both a 4–20 mA signal and high-speed Modbus data, cable quality is vital.
- Constraint: Use a high-quality, overall shielded multi-conductor cable. The shield must be grounded at the control cabinet end only to prevent ground loops, which can introduce noise into the flame intensity signal.
4. Hazardous Area Integrity
The CEX housing relies on a flame-path to maintain its explosion-proof rating.
- Warning: Never open the scanner housing in a hazardous area while the circuit is live. Ensure the O-rings are lubricated with the manufacturer-recommended silicone grease to prevent moisture ingress, which can lead to internal corrosion.
FAQ
Q: Can I replace a 95UVS1-1CEX with a 95UVS1E-1CEX?
A: Yes. The “E” version is the enhanced model featuring improved internal diagnostics and faster processing. It is generally backward compatible, but you should verify that your existing cable pinouts match the new “E” series documentation.
Q: How do I know if the lens is dirty?
A: If your 4–20 mA flame intensity signal is steadily decreasing over weeks despite no change in burner load, the lens likely requires cleaning.
Q: Does this scanner support IR (Infrared) detection?
A: No. The 95UVS is Ultraviolet only. If you are burning coal or heavy oil which produces a high-IR flame, you would typically use the 95IRS (Infrared) or the 95DSS (Dual Sensor) models.
