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Product Introduction
Here is the hard truth about burner management: if the scanner lies, the plant stops. The FIREYE SC2L-85UVF1-Section CEX is the nerve center of your combustion safety loop. It is a UV flame detector assembly designed to see fire where the human eye cannot, converting that visual confirmation into a precise 4-20 mA signal for the control system. This isn’t just glass and wire; it is a Safety Integrity Level (SIL) rated component.What makes this specific model valuable is its ruggedized design for high-ambient-temperature zones and its immunity to solar blindness (false positives from sunlight). Unlike older cadmium-sulfide cells, this UV tube reacts in milliseconds. If you are maintaining an older boiler system or replacing a failed unit in a critical heat process, this SC2L assembly is the “plug-and-pray” solution—get it right, and the burner runs; get it wrong, and you have a costly lockout.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Model Number | SC2L-85UVF1-1CEX |
| OEM Brand | FIREYE (Now part of Honeywell) |
| Product Type | Flame Scanner / UV Sensor Assembly |
| Input Voltage | 120 VAC, 60 Hz |
| Output Signal | 4-20 mA (Flame Present) |
| Sensor Type | UV (Ultraviolet) Detector Tube |
| Viewing Window | Sapphire (High Scratch Resistance) |
| Ambient Temp. | -40°F to +175°F (-40°C to +79°C) |
| Hazardous Area | Class I, Division 1, Groups C & D |
| Mounting | 3/4″ NPT Threaded |
Installation & Wiring Guide
Phase 1: Preparation (Est. 10 min)
- Permit to Work: Lock out the burner control panel. Combustion safety circuits are “life-critical.”
- Toolkit: 3/4″ NPT pipe wrench, multimeter, small flathead screwdriver.
- Visual Check: Inspect the sight glass on the furnace. If it is dirty, clean it before installing the new scanner.
Phase 2: Removal of Old Unit (Est. 15 min)
- Depressurize: If purged, isolate the air supply.
- Disconnect: Unscrew the 3/4″ NPT fitting from the burner brick.
- Wire ID: Take a photo of the terminal block wiring. Note if it is wired for “Fail-Safe” (usually 4-20 mA = Flame, 0 mA = No Flame).
Phase 3: Installing the SC2L (Est. 20 min)
- Seal Check: Ensure the Viton O-ring is seated correctly on the threads. A damaged O-ring causes moisture ingress and false faults.
- Thread Tape: Use high-temp PTFE tape on the NPT threads to prevent gas leaks.
- Insertion: Screw the unit into the burner housing until finger tight, then 1/4 to 1/2 turn more with the wrench. Do not over-torque.
- Wiring: Connect the Black wire to (+) 120 VAC / 4-20 mA return. Connect the White wire to (-) Common. Double-check polarity.
Phase 4: Functional Test (Est. 30 min)
- Power Up: Restore control power.
- Simulate Flame: Use a UV flashlight (or a lighter flame held briefly at the window) to simulate fire.
- Meter Check: Measure the mA signal. It should jump from ~0 mA (no flame) to >15 mA (flame detected).
- Burner Test: Initiate a light-off sequence. The scanner must “see” the flame within the trial-for-ignition window (usually 10-15 seconds).
