(I) Core Parameters

Model: LG1093AA24 (261A1812P012)

Detection Principle: Ultraviolet (UV) photoelectric detection

Spectral Response: 190–290 nm (characteristic wavelength band for hydrocarbon flames)

Sensitivity: <5 mW/cm²

Response Time: Typical ≤10 ms

Operating Voltage: 260–350 VDC (optimal: 325 VDC±25 VDC)

Operating Temperature: -40°C ~ 177°C

Pressure Withstand Rating: 21 bar at 316°C

Ingress Protection: IP65Field of View: 80°

Housing Material: 1.4571 stainless steel

Certifications: Class I Div 1/2, ATEX II 2G Ex db, CE-EMC, SIL 2

Application Scenarios

FAQ

1. 1. No output signal from the sensor?

• Check power supply: Ensure stable 260–350 VDC input with correct polarity connection.
• Inspect wiring: Verify tight cable terminals and proper shielding grounding.
• Clean sight window: Grease or dust covering the window leads to insufficient signal.
• Eliminate ambient interference: Keep away from high-electromagnetic equipment such as inverters and welding machines.

1. 2. Frequent false alarm (alarm triggered without actual flame)?

• Excessive sensitivity: Reduce the sensitivity threshold on the control module.
• Direct intense light exposure: Shield from ultraviolet sources including sunlight, electric arcs and welding sparks.
• Electromagnetic interference: Check cable shield grounding and distance from high-frequency equipment.
• Contaminated sight window: Clean window surface to prevent reflective disturbance.

1. 3. Unit malfunction under high ambient temperature?

• Confirm model suitability: LG1093AA24 withstands maximum 177°C; select high-temperature customized version for over-temperature conditions.
• Optimize mounting position: Avoid direct radiant heat from furnace and reserve cooling clearance.
• Cable specification: Deploy high-temperature resistant armored cables for hot environments.

1. 4. Is cross-brand replacement available?

• Direct drop-in replacement for GE 261A1812P012 (OEM counterpart of identical specification).
• Replacement for Siemens QRA or domestic UV flame sensors requires verification of power rating, wiring definition and signal output parameters; an adapter module is needed where necessary.

1. 5. Service life and periodic replacement requirement?

• Minimum service life ≥5 years under normal operating conditions (≤150°C, non-corrosive atmosphere).
• Functional test every six months and window cleaning once per year are recommended.
• Replace promptly upon unstable signal, delayed response or cracked sight window.

1. 6. Applicable for hazardous explosive areas?

• Certified with Class I Div 1/2 and ATEX II 2G Ex db approvals, suitable for Zone 1 & Zone 2 hazardous locations in petrochemical, chemical and natural gas industries.Installation shall comply with relevant explosion-proof codes with certified explosion-proof cable glands applied.