Editorial Technical Reference

Flame Sensor/Scanner

This page explains how Flame Sensor/Scanner is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A safety device that detects the presence or absence of flame in combustion systems to ensure proper ignition and prevent hazardous conditions.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Flame Sensor/Scanner

Definition
A flame sensor/scanner is a critical safety component used in combustion systems, such as industrial burners, boilers, and furnaces. Its primary function is to continuously monitor the presence of a flame and provide real-time feedback to the control system. This feedback is essential for maintaining safe combustion operations, as it enables the system to confirm proper ignition, monitor flame stability, and initiate shutdown sequences in the event of flame failure. By detecting flame loss promptly, the sensor helps prevent the accumulation of unburned fuel, which could lead to explosions or equipment damage. The sensor operates using various detection methods, including ultraviolet (UV) radiation, infrared (IR) radiation, or flame rectification. UV sensors detect the ultraviolet light emitted by flames, IR sensors monitor infrared radiation patterns, and flame rod sensors rely on the electrical conductivity of ionized gases in the flame to generate a small current. The detected signal is processed by the control system to determine flame status. Typical specifications include a detection distance of 0.5–2.0 meters, response time of 0.5–2.0 seconds, spectral range of 190–380 nm, supply voltage of 24 V DC ±10%, power consumption of 3–8 W, output signal of 4–20 mA, operating and storage temperatures of -40 to 85 °C, ingress protection rating of IP65–IP67, housing material of 316L stainless steel, weight of 0.5–1.5 kg, and cable length of 2–10 meters. These values are reference ranges and must be verified for the specific model and application. The sensor is constructed with a stainless steel housing, quartz glass lens, UV/IR sensitive semiconductor elements, and ceramic insulators. It is designed for industrial environments, offering dust-tight and water-jet protection. When selecting a flame sensor, it is essential to consider the combustion system's requirements, such as fuel type, flame characteristics, and environmental conditions. Verification of model-specific values and standards with the legal manufacturer or supplier is mandatory before procurement or installation.
Working Principle
The flame sensor operates by detecting specific characteristics of a flame. UV sensors detect ultraviolet light emitted by flames, typically in the 190–380 nm range, which is distinct from ambient light. IR sensors monitor infrared radiation patterns, which fluctuate with flame flicker. Flame rod sensors use the electrical conductivity of ionized gases in the flame to create a small current. The sensor's signal is processed by the control system to determine flame presence. If the signal falls below a threshold, the system triggers a shutdown to prevent unsafe conditions.
Common Materials
Stainless steel housing, Quartz glass lens, UV/IR sensitive semiconductor elements, Ceramic insulators
Technical Parameters
ParameterTypical rangeNotes & selection driver
Detection Distance0.5–2.0 mMaximum distance from flame to sensor for reliable detection
Response Time0.5–2.0 sTime to signal flame loss; faster for safety shutdown
Spectral Range190–380 nmUV range for flame detection; avoids false triggers from ambient light
Supply Voltage24 ±10% V DCTypical industrial DC supply; other voltages available
Power Consumption3–8 WIncludes sensor and amplifier electronics
Output Signal4–20 mAAnalog output proportional to flame intensity
Operating Temperature-40–85 °CFor sensor head; amplifier may have narrower range
Storage Temperature-40–85 °CNon-condensing environment
Ingress ProtectionIP65–IP67Dust-tight and protected against water jetsIEC 60529
Housing Material316LStainless steel for corrosion resistanceASTM A240
Weight0.5–1.5 kgDepends on cable length and mounting
Cable Length2–10 mStandard lengths; longer on request

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Optical Lens Part
    Focuses and transmits flame radiation to the sensing element
    Material: Quartz glass
  • Sensing Element Part
    Converts flame radiation into electrical signals
    Material: UV/IR sensitive semiconductor
  • Signal Amplifier
    Boosts weak detection signals for processing
    Material: Electronic components on PCB
  • Protective Housing Part
    Shields internal components from heat, dust, and environmental damage
    Material: Stainless steel
  • Flame Rod Optional
    Senses flame by the current that ionized combustion gases conduct, on rod-type detectors.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 1 bar (typical), up to 2 bar (max with special housing)
other spec: Response time: <2 seconds, Detection range: 0.5-10 meters, Wavelength sensitivity: UV (180-260 nm) or IR (4.0-4.6 μm) depending on model
temperature: -40°C to 85°C (operating), up to 120°C (short-term exposure)
Media Compatibility
✓ Natural gas combustion systems ✓ Oil-fired burners ✓ Coal-fired power plant boilers
Unsuitable: High-vibration environments without shock mounting (e.g., near heavy machinery with >5g vibration)
Sizing Data Required
  • Burner/furnace diameter or flame size
  • Required response time for safety shutdown
  • Ambient light/radiation interference level

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Lens contamination
Cause: Accumulation of soot, dust, or process deposits on the optical lens, reducing sensitivity and causing false alarms or failure to detect flame.
Electronics degradation
Cause: Thermal stress, vibration, or moisture ingress leading to circuit board failure, component drift, or signal processing errors.
Maintenance Indicators
  • Intermittent or false flame detection alarms during stable combustion conditions
  • Visible accumulation of soot or debris on the sensor lens or housing
Engineering Tips
  • Implement regular lens cleaning schedule using appropriate optical cleaning solutions and soft materials to prevent scratching
  • Ensure proper environmental sealing and vibration isolation during installation, and maintain stable power supply within manufacturer specifications

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 13849-1: Safety of machinery - Safety-related parts of control systems ANSI/ISA-12.12.01: Nonincendive Electrical Equipment for Use in Class I and II, Division 2 and Class III, Divisions 1 and 2 Hazardous (Classified) Locations DIN EN 50104: Electrical apparatus for the detection and measurement of oxygen - Performance requirements and test methods

Quoted from the published standard.

Manufacturing Precision
  • Response Time: +/- 0.5 seconds
  • Detection Range: +/- 5% of specified distance
Quality Inspection
  • Functional Safety Test (including response time verification)
  • Environmental Sealing Test (IP rating verification for ingress protection)

Manufacturers of Flame Sensor/Scanner

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Frequently Asked Questions

What is the typical response time for a flame sensor?

The response time is typically 0.5–2.0 seconds, but this is a reference range. The actual response time depends on the specific model and application. Verify with the manufacturer.

Can a flame sensor detect both UV and IR radiation?

Some models may incorporate both UV and IR detection, but the source facts list UV/IR sensitive semiconductor elements. The specific detection method depends on the model. Check the product specifications.

What is the maximum operating temperature for the sensor head?

The operating temperature range is -40 to 85 °C, but this is for the sensor head. The amplifier may have a narrower range. Always verify with the manufacturer for your application.

Is the flame sensor suitable for outdoor use?

The ingress protection rating is IP65–IP67, indicating dust-tight and protection against water jets. However, the operating temperature range and other environmental factors must be considered. Confirm with the supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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