Description
Product Introduction & Engineering Value
A flame scanner has one job that cannot be treated casually: distinguish the intended burner flame from everything else the optical system can see. The 95UVS2-1 does this using solid-state ultraviolet detection and microprocessor-based signal processing. It also incorporates its flame relay into the scanner, eliminating the need for a separate remote flame amplifier in the standard architecture.
The S2 designation matters. Compared with the basic S1 configuration, the S2 version provides AutoTune, additional flame-flicker frequency selections, expanded programmable-file capability, and enhanced remote-communication functions.
Technical Specifications
| Specification | 95UVS2-1 |
|---|---|
| Manufacturer | Fireye |
| Series | InSight I / Type 95 |
| Detection Type | Ultraviolet |
| UV Response | Approximately 295–320 nm |
| Supply Voltage | 24 VDC |
| Supply Tolerance | +10% / -15% |
| Supply Current | 0.35 A |
| Power Consumption | 8.5 VA |
| Electrical Connection | 12-pin quarter-turn quick disconnect |
| Flame Relay | SPST, normally open |
| Fault Relay | SPST, normally closed |
| Analog Output | 4–20 mA DC |
| Maximum Analog Load | 750 Ω |
| Display | 8-character alphanumeric LED |
| Operator Interface | Four pushbuttons |
| Ambient Temperature | -40°F to +150°F (-40°C to +65°C) |
| Enclosure Rating | NEMA 4X / IP66 on applicable configurations |
These electrical and environmental specifications are documented for the 95UVS2-1. Fireye’s documentation also specifies electronic self-checking, so the scanner does not rely on a conventional mechanical shutter for its self-test function.
S2 Configuration
The S2 version is the expanded InSight configuration. During commissioning, it can automatically select an appropriate flame-modulation frequency and sensor gain. The system evaluates the modulation—or “flicker”—of the target flame to improve flame ON/OFF discrimination.
The scanner also supports multiple programmable files, useful when a burner operates with different fuels or firing conditions.
Field Application & the “Trench” Experience
A process heater begins tripping on intermittent flame failure. The burner visibly remains lit, yet the BMS occasionally receives a flame-off condition.
The first reaction is usually to replace the scanner.
The experienced technician checks the sight path, scanner alignment, optical contamination, flame geometry, wiring, grounding, and actual flame-flicker signal first. If the scanner is confirmed defective, the replacement must match the original configuration. A standard 95UV scanner, an IR version, and a dual UV/IR version may share similar mechanical characteristics but are not functionally interchangeable.
With the 95UVS2-1, commissioning also matters. The S2 electronics are designed to optimize modulation frequency and sensor gain during setup, so a replacement scanner should be properly configured against the actual burner rather than simply energized and left at factory settings.
Specific Application Scenarios
- Industrial boiler burner flame supervision for continuous verification of burner flame.
- Process-heater burner management where UV discrimination is appropriate for the fuel and flame geometry.
- Multi-burner furnace applications requiring reliable discrimination between a target flame and nearby burners.
- Legacy Fireye scanner replacement where an existing InSight I installation must be maintained.
95UVS2-1
95UVS2-1
Transparency SOP: QA & Testing
For a New Surplus or refurbished 95UVS2-1, I would use the following acceptance sequence:
1. Identity check
Verify the complete 95UVS2-1 model marking, serial number, revision information, and configuration.
2. Optical inspection
Inspect the viewing window for contamination, scratches, deposits, discoloration, or physical damage.
3. Mechanical inspection
Check the housing, mounting threads, cooling-air connection, connector, and sealing surfaces.
4. Electrical test
Apply the specified 24 VDC supply using a controlled source and verify normal startup behavior.
5. Interface test
Check the LED display, keypad, flame relay, fault relay, and 4–20 mA output.
6. Functional flame test
Where an approved burner test arrangement is available, verify flame detection and flame-failure response under controlled conditions.
7. Configuration test
Verify the S2 AutoTune/setup behavior and confirm that the scanner can discriminate the target flame from the expected background environment.
A power-up test alone is not sufficient for combustion-safety equipment.
The Veteran’s Tech Trap Guide
⚠️ Trap #1 — Confusing 95UVS2-1 with 95UVS1-1
Both are UV InSight scanners, but the S2 is the expanded configuration. Fireye describes S2 units as having AutoTune/manual override capabilities, more selectable flame-flicker frequencies, additional programmable files, and expanded communications.
PRO TIP: Match the complete model number. Do not reduce the purchase specification to “Fireye 95UV.”
⚠️ Trap #2 — Confusing UV, IR, and dual-sensor models
95UVS2-1 is UV. 95IRS2-1 is IR, while 95DSS2-1 combines IR and UV. Fireye treats these as different scanner configurations.
⚠️ Trap #3 — Ignoring the 12-pin connector
The standard 95UVS2-1 uses a 12-pin quarter-turn quick disconnect. The CG versions instead use a cable gland and captive cable, while CEX versions use a different hazardous-area connection arrangement.
⚠️ Trap #4 — Treating an old scanner as a current-design spare
Fireye’s current product documentation states that 95UVS2-1 and its variants were effectively obsolete as of February 5, 2020, and identifies 95UVS4-1WINC as the recommended replacement for 95UVS2-1.
That makes exact 95UVS2-1 stock potentially valuable for legacy equipment, but replacement qualification should be performed before changing to the newer model.
Dynamic FAQ
What is Fireye 95UVS2-1?
The 95UVS2-1 is a Fireye InSight I Type 95 integrated ultraviolet flame scanner with a quick-disconnect electrical interface. It incorporates flame processing and an internal flame relay.
What voltage does 95UVS2-1 use?
It uses 24 VDC, with a published supply tolerance of +10%/-15% and approximately 0.35 A supply current.
What does the S2 designation mean?
S2 identifies the expanded InSight configuration. It adds AutoTune/manual override capability, more selectable flame-flicker frequencies, additional programmable files, and enhanced remote communications compared with the S1 configuration.
Does 95UVS2-1 have a 4–20 mA output?
Yes. The published specification provides a 4–20 mA DC analog flame-strength output with a maximum connected load of 750 Ω.
Is 95UVS2-1 obsolete?
Yes. Fireye’s current documentation lists the original 95UVS2-1 among models that became effectively obsolete in 2020 and recommends 95UVS4-1WINC as its replacement.
Is 95UVS2-1 interchangeable with 95UVS4-1WINC?
It should not be assumed to be a blind drop-in replacement. Fireye identifies 95UVS4-1WINC as the recommended replacement, but the installation should still be checked for wiring, configuration, mounting, commissioning, and application requirements.
How do I verify New Surplus authenticity?
Request photographs of the actual 95UVS2-1, including its model label, serial number, connector, optical window, housing, and original packaging. Ask the supplier to distinguish explicitly between New OEM, New Surplus/NOS, refurbished, and used-tested stock.
What warranty should I request?
For a legacy combustion-safety scanner, require a written warranty covering the complete scanner and specifying the condition supplied. One current secondary-market listing advertises one-year warranty coverage, but that is a seller warranty and should not be confused with current OEM warranty status.
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