Energy Combustion

Energy combustion, Ahmadabad Importer and Suppliers of all types of siemens make flame sensor.

The Siemens QRA53.E27 is a high-performance UV flame detector designed specifically for continuous operation in industrial oil and gas burner systems. Unlike standard sensors, it features a self-checking mechanism (shutter) to ensure the UV cell is functioning correctly during long-term firing.

•  Self-Checking Mechanism: The detector includes an integrated stepper motor that drives a swiveling shutter. This shutter periodically interrupts the UV radiation to test the cell's responsiveness, which is mandatory for burners operating for more than 24 hours without a shutdown

• Compatible Burner Controls: Specifically designed for use with Siemens burner control units like the LGK16 and LGI16.

  Protection: It features a quartz-glass window to protect the UV cell and shutter from dirt and heat.

• Accessories: It typically requires an AGM19 connecting cable and is often supplied with a mounting clamp. It can be mounted directly on the burner or via an AGG06 glass holder/ AGG16 adapter for cooling air.

• Supervision of gas flames.

• Monitoring of yellow or blue-burning oil flames.

• Ignition spark proving.

• Suitable for "green fuel" blends (e.g., hydrogen-oil mixes).

ENERGY COMBUSTION,Ahmedabad importer and suppliers of siemens make flame sensor.

The Siemens QRA50M is a high-durability, self-checking ultraviolet (UV) flame detector designed for continuous operation. It is an older, specialized model that is often considered "obsolete" or legacy in many regions, but it remains a critical component in industrial settings where it is paired with the LFE50 UV flame safeguard system.

Full Technical Specifications

Key Features & Design

• Shutter Mechanism: The QRA50M contains a rotating cylindrical shutter driven by a synchronous motor. This shutter interrupts the UV radiation reaching the cell 3 times every second. This constant "on-off" cycle allows the control unit (LFE50) to verify that the UV cell has not failed in a "permanently on" state (simulated flame), which is a vital safety requirement for burners running longer than 24 hours.

• Cooling Air Connection: The mounting flange includes a 3/8” tapping on the side. This allows for the connection of cooling air, which is necessary if the detector is mounted in high-heat areas or if there is a risk of soot buildup on the lens.

• Rugged Housing: The head is made of die-cast alloy and features a quartz-glass lens to seal the unit from the combustion chamber pressure (up to 500 mbar).

Comparison: QRA50M vs. QRA51M

You will often see these two listed together. The primary difference is the Protection Rating:

• QRA50M: Rated IP54 (better protection against water splashes and dust).

• QRA51M: Rated IP40 (more open design, typically for cleaner environments).

Installation & Wiring

The QRA50M typically uses a 5-core cable if the distance is under 30 meters. For longer distances (up to 200m), a specific wiring configuration using a 2-core and a 3-core cable is recommended to reduce electrical interference.

Maintenance Tip: The internal UV cell has an expected life of approximately 10,000 hours. If the burner control unit (LFE50) triggers a lockout during the startup check, it is often due to the UV cell losing its "quenching" ability, meaning it needs to be replaced.

Siemens offers a comprehensive range of flame detectors categorized by their detection technology (UV, Infrared, or Photoresistive) and their operational mode (Intermittent or Continuous).

The following guide breaks down the full details of the Siemens portfolio for industrial and commercial burners.

Choosing the right sensor depends on the fuel type and the specific light spectrum emitted by the flame.

• Intermittent Operation: For burners that shut down at least once every 24 hours. These sensors (like QRA2 or QRB1) do not have built-in self-testing.

• Continuous Operation: For burners running 24/7. These sensors (like QRA53/55 or QRA7) feature a self-checking shutter that periodically blocks the sensor to ensure it hasn't failed in a "flame-on" state.

Most common for gas burners. UV cells are highly precise but sensitive to "false" UV from welding or ignition sparks.

• QRA2 / QRA10: Standard for intermittent operation. QRA10 has a die-cast aluminum housing for tougher environments.

• QRA4: Designed specifically for the US market (NPSM threads).

• QRA53 / QRA55: Industrial self-checking sensors for continuous use.

• QRA7: Advanced digital UV sensor designed for the LMV5 burner management system.

Designed for large-scale industrial burners where the flame produces significant heat but might have low UV output.

• QRI2A: Frontal illumination (looks straight ahead).

• QRI2B: Lateral illumination (looks out the side at 90°).

• Key Feature: They ignore static heat (like glowing bricks) and only respond to the flicker frequency of an active flame.

The "budget-friendly" standard for residential and commercial oil burners.

• QRB1: Small, plastic housing with or without a plug.

• QRB3: Rugged version with a metal protective tube.

• QRB4: High-sensitivity version for yellow-burning oil.

Siemens sensors often require specific accessories to protect the sensor from heat and debris:

• AGG06: Glass/Quartz holder for QRA10/QRA53 to protect the lens from soot.

• AGG02: Heat insulation glass for high-temperature applications.

• AGG16: Right-angle adapters for tight installation spaces.

1. Cleaning: Use only a dry, lint-free cloth. Never use chemical sprays on the lens.

2. UV Cell Life: Standard UV tubes (like in the QRA2) have a life of ~10,000 hours. If you get frequent "no flame" lockouts on an old sensor, the tube is likely exhausted.

3. Safety: Always isolate the mains power before swapping a sensor, as some (like the QRA53) have internal high-voltage or motorized parts.

Energy Combustion, Ahmedabad supplier of Kromschoder Flame sensor.

The UVZ780 is a ultraviolet (UV) flame detector manufactured by Kromschröder (part of the Honeywell group). It is primarily designed for monitoring gas flames in industrial burner applications. Unlike the Siemens sensors discussed previously, this unit is specifically tailored for use with Kromschröder's own burner control units.

The UVZ780 is available in three color-coded sensitivity levels to match different flame types and distances:

1. UVZ 780 Blue (Standard): Most common; used for standard gas burners.

2. UVZ 780 White (Medium): For applications where standard sensitivity is too high.

3. UVZ 780 Red (Low): Used for high-capacity burners to prevent saturation or "over-exposure" from very large flames.

The UVZ780 is designed to work seamlessly with the following Kromschröder burner control units:

• BCU 370 / 440 / 460 / 480

• IFS 110 / 244 / 258

• PFS 778 / 748

• Side-on and End-on viewing: Depending on the housing configuration, it can be used for frontal or lateral flame monitoring.

• Rugged Construction: Its IP54 rating and high temperature tolerance make it suitable for heavy industrial environments like kilns and furnaces.

• Quartz Glass Protection: The sensor is protected by a quartz glass pane that is transparent to UV light but resistant to thermal stress.

• Avoid Ignition Spark: The sensor is sensitive to UV radiation from ignition sparks. It must be positioned so it cannot "see" the spark, or the control unit must be configured to ignore the signal during the ignition period.

• Cooling Air: For high-temperature applications, it is often mounted using a cooling air adapter to prevent the sensor from exceeding its $80^\circ\text{C}$ limit.

• Cleaning: The quartz glass must be kept clean. Even a thin film of oil or dust can significantly reduce UV sensitivity.

The Siemens QRA50M is a high-durability, self-checking ultraviolet (UV) flame detector designed for continuous operation. It is an older, specialized model that is often considered "obsolete" or legacy in many regions, but it remains a critical component in industrial settings where it is paired with the LFE50 UV flame safeguard system.

• Shutter Mechanism: The QRA50M contains a rotating cylindrical shutter driven by a synchronous motor. This shutter interrupts the UV radiation reaching the cell 3 times every second. This constant "on-off" cycle allows the control unit (LFE50) to verify that the UV cell has not failed in a "permanently on" state (simulated flame), which is a vital safety requirement for burners running longer than 24 hours.

• Cooling Air Connection: The mounting flange includes a 3/8” tapping on the side. This allows for the connection of cooling air, which is necessary if the detector is mounted in high-heat areas or if there is a risk of soot buildup on the lens.

• Rugged Housing: The head is made of die-cast alloy and features a quartz-glass lens to seal the unit from the combustion chamber pressure (up to 500 mbar).

You will often see these two listed together. The primary difference is the Protection Rating:

• QRA50M: Rated IP54 (better protection against water splashes and dust).

• QRA51M: Rated IP40 (more open design, typically for cleaner environments).

The QRA50M typically uses a 5-core cable if the distance is under 30 meters. For longer distances (up to 200m), a specific wiring configuration using a 2-core and a 3-core cable is recommended to reduce electrical interference.

Maintenance Tip: The internal UV cell has an expected life of approximately 10,000 hours. If the burner control unit (LFE50) triggers a lockout during the startup check, it is often due to the UV cell losing its "quenching" ability, meaning it needs to be replaced.

ENERGY COMBUSTION, Ahmadabad supplying all types of Siemens make Flame Sensors.

The Siemens QRI2B2.B180B is an infrared (IR) flame detector designed for use with Siemens burner controls, specifically the LMV5 series. Unlike the UV-based QRA53, this sensor detects the infrared radiation of a flame, making it ideal for gas, oil, and coal flames that produce a strong IR signature.

•  Continuous Operation: Features electronic self-supervision, allowing it to be used for burners that run for more than 24 hours without a shutdown (continuous operation).

• Integrated Amplifier: The flame signal is amplified directly within the detector housing, allowing for a stable 0–5 V signal output.

• Selective Sensitivity: It is designed to ignore constant radiation (like glowing refractory brickwork) and mains frequency harmonics (50/60 Hz). It specifically looks for the "flicker" frequency of a real flame.

• Mounting: It is typically secured to the burner using a flange and clamp. Because of its high sensitivity, it is usually installed behind the burner's baffle plate.

   

The main difference between the models in this series is the direction from which the sensor "sees" the flame:

• QRI2A: Frontal illumination (the sensor looks straight out the tip).

• QRI2B: Lateral illumination (the sensor looks out the side at a 90° angle).

Since this is an IR detector, it is sensitive to heat sources. To avoid false "flame present" signals, ensure it is not exposed to modulated IR radiation from moving hot parts or air turbulence that might cause hot surfaces to "shimmer" in a way that mimics a flame's flicker.

The Siemens QRA75.A27 is a high-sensitivity ultraviolet (UV) flame detector specifically engineered for continuous operation (more than 24 hours of uninterrupted firing). It is widely used in industrial burner systems to monitor gas flames, yellow/blue-burning oil flames, and to verify ignition sparks.

Like the QRA53, it features a self-checking shutter mechanism to ensure the UV cell is always functional.

• Compact Size: The QRA75.A27 uses the shorter 69 mm tube length, making it suitable for compact burner designs where space is limited. (The QRA73 is the equivalent long-tube version at 125 mm).

• Control System Integration: Specifically designed for use with Siemens LMV5... and LME75... burner management systems.

• Cable Connection: It uses the AGM23 (standard) or AGM23U (US design) connecting cable, which is distinct from the AGM19 cable used by the QRA53 series.

• AGG16.C / AGG16.U: Right-angle adapter (used to mount the sensor at a 90° angle to the viewing port).

• AGG06: Glass or quartz-glass lens holder (to protect against heat and increase sensitivity).

• 419988060: Mounting clamp (usually included).

Electrical Safety: Before replacing or servicing the UV cell, you must isolate the power supply completely. The shutter mechanism is driven by an internal stepper motor; ensure the cable is seated correctly to prevent signal loss during the self-check cycle.

Energy combustion,Ahmadabad importer and suppliers of siemens make flame sensor.

The Siemens QRA4.U is a UV flame detector designed for intermittent operation (burners that shut down at least once every 24 hours). It is essentially the "US version" of the QRA series, featuring specific NPSM threading for pipe mounting directly onto the burner or boiler.

Unlike the QRA53 or QRA75, the QRA4.U cannot be serviced—the UV cell is glued into the housing. If the cell fails, the entire unit must be replaced.

• Frontal Illumination: The sensor is designed to "see" the flame looking straight out of the front of the detector housing.

• Fuel Compatibility: Monitors gas flames, yellow-burning oil flames, blue-burning oil flames, and ignition sparks. It is also tested for "green fuel" blends like HVO.

• Housing Material: Durable die-cast aluminum, making it suitable for harsh industrial environments.

• Ignition Spark Proving: Highly sensitive to the UV radiation emitted during the ignition phase.

The QRA4.U is a versatile sensor used with a wide range of Siemens controllers, often requiring an ancillary unit (like the AGQ1/2/3) depending on the control box:

• LFL / LAL / LME series

• LGB2... / LGB4...

• LMV2 / LMV3 / LMV5 (when configured for intermittent operation)

The "M" variant is the high-sensitivity version of this sensor.

• QRA4.U: Standard sensitivity for most gas and oil applications.

• QRA4M.U: High sensitivity, often used when the flame is very small, far away, or obscured by burner components.

Because the QRA4.U is sensitive to UV light, it can be "fooled" by other UV sources. Avoid mounting it where it might see halogen lamps, welding sparks, or X-rays, as these can cause a false "flame present" signal even when the burner is off.

Energy combustion,Ahmadabad local source of all types of siemens make flame sensor.

The Siemens QRB3 is a photoresistive flame detector designed specifically for supervising yellow-burning oil flames. Unlike the industrial QRA or QRI series, the QRB3 is used primarily for intermittent operation (systems that shut down at least once every 24 hours).

The "3" in the model name indicates that this version comes with a metal protective tube, which sets it apart from the more compact plastic-housed QRB1.

• Visible Light Detection: It is tuned to 600 nm, which perfectly matches the light emitted by yellow oil flames. However, this means it is also sensitive to ambient light (like boiler room lighting or sunlight), so it must be shielded from external light sources.

• Metal Housing: The QRB3 is more rugged than the QRB1 due to its 17 mm metal protective tube. This makes it suitable for burners where the sensor is subjected to more mechanical stress.

• Sensitivity Variants: * QRB3: Normal sensitivity (identifiable by a black plastic insert).

  • QRB3S: High sensitivity (identifiable by a red plastic insert).

• Compatible Burner Controls: It is used with a wide range of Siemens/Landis & Staefa controllers, including the LOA..., LAL..., LMO..., and LMV... series.

The QRB3 is almost always secured using a specific flange and clamp system.

• Flange Part No: 428614900

• Clamp Part No: 418688060

Maintenance Note: When cleaning the sensor, never use burner cleansing sprays. Use only a clean, dry, lint-free cloth to avoid damaging the photoresistive element.

NERGY COMBUSTION, Ahmadabad supplying all types of Siemens make Flame Sensors.

The Siemens QRI2B2.B180B is an infrared (IR) flame detector designed for use with Siemens burner controls, specifically the LMV5 series. Unlike the UV-based QRA53, this sensor detects the infrared radiation of a flame, making it ideal for gas, oil, and coal flames that produce a strong IR signature.

•  Continuous Operation: Features electronic self-supervision, allowing it to be used for burners that run for more than 24 hours without a shutdown (continuous operation).

• Integrated Amplifier: The flame signal is amplified directly within the detector housing, allowing for a stable 0–5 V signal output.

• Selective Sensitivity: It is designed to ignore constant radiation (like glowing refractory brickwork) and mains frequency harmonics (50/60 Hz). It specifically looks for the "flicker" frequency of a real flame.

• Mounting: It is typically secured to the burner using a flange and clamp. Because of its high sensitivity, it is usually installed behind the burner's baffle plate.

   

The main difference between the models in this series is the direction from which the sensor "sees" the flame:

• QRI2A: Frontal illumination (the sensor looks straight out the tip).

• QRI2B: Lateral illumination (the sensor looks out the side at a 90° angle).

Since this is an IR detector, it is sensitive to heat sources. To avoid false "flame present" signals, ensure it is not exposed to modulated IR radiation from moving hot parts or air turbulence that might cause hot surfaces to "shimmer" in a way that mimics a flame's flicker.

ENERGY COMBUSTION, Ahmadabad supplying all types of Siemens make Flame Sensors.

The Siemens QRA10M.C is the high-sensitivity version of the industrial QRA10 series. It is housed in a heavy-duty die-cast aluminum casing and is designed for intermittent operation (systems that cycle at least once every 24 hours).

While it shares the same physical build as the standard QRA10.C, the "M" designation indicates it is equipped with a more sensitive UV cell, making it suitable for applications where the flame signal might be weak.

The primary distinction is the internal UV tube. Because the QRA10M.C is highly sensitive, it is often used in situations where the detector must be mounted further away from the flame or where the viewing path is partially obstructed.

• QRA10.C (Standard): Uses the AGR4 502 1131 0 cell.

• QRA10M.C (High): Uses the AGR4 502 4065 0 cell (same as the QRA2M).

• Cooling Air: Includes a lateral 1/8" tapping for cooling air, which helps keep the lens clean from soot and prevents the internal electronics from overheating.

• Mounting Coupling D: This threaded socket is usually supplied with the unit and allows it to be screwed directly onto a 1" viewing tube or attached to a ball head (AGG07).

• Interference Warning: High-sensitivity sensors are even more susceptible to false signals from ignition sparks, welding arcs, or X-rays. Proper shielding and aiming are critical to prevent "simulated flame" lockouts.

The QRA10M.C works with most Siemens control boxes, but its high sensitivity signal often requires specific auxiliary modules for compatibility:

• Direct Connection: LFL, LAL, LGI16, LGK16.

• With Adapter (AGK30/AGQ1): LFS1.2, LME series, LMV2/3.

Maintenance Note: The UV cell is a consumable item with a lifespan of roughly 10,000 hours. If you notice the burner failing to detect a flame that is clearly visible, the UV tube likely needs replacement.

Energy Combustion, Ahmedabad Importer, Supplier, Trader of all types of Siemens make Flame Sensor, Ultraviolet Flame Sensor,UV CELL , Infrared Flame Sensor.

The Siemens QRA10.C is a robust ultraviolet (UV) flame detector housed in a heavy-duty die-cast aluminum casing. It is designed for intermittent operation (systems that shut down at least once every 24 hours) and is primarily used for monitoring gas flames, yellow or blue-burning oil flames, and ignition sparks.

The "C" in the model name specifically denotes the standard sensitivity version with a die-cast aluminum housing.

• Rugged Housing: Unlike the plastic QRA2, the QRA10.C is designed for harsh industrial environments where mechanical durability and better environmental sealing (IP54) are required.

• Cooling Air Connection: The housing features a connection for cooling air (1/8" thread). This is essential for preventing soot deposits on the lens and for keeping the UV cell within its temperature limits in high-heat applications.

• Versatile Mounting: It is typically mounted on a viewing tube. The detector can be easily unscrewed from its mounting flange for cleaning without needing to recalibrate the position.

• Field Serviceable: The internal UV tube (AGR4 502 1131 0) is replaceable, which is a cost-effective alternative to replacing the entire unit if the sensor wears out.

The QRA10.C is compatible with a wide range of Siemens/Landis & Staefa control units, though some require an adapter for the signal to be processed correctly:

• Direct Connection: LFL, LAL, LGI16, LGK16.

• With Adapter (AGQ1/2/3): LME21, LME22, LME39, LMV2, LMV3.

The primary difference lies in sensitivity:

• QRA10.C: Standard sensitivity for most industrial burners.

• QRA10M.C: High sensitivity, used when the flame signal is weak due to a long distance from the sensor or an obscured line of sight.

UV cells naturally degrade over time (approx. 10,000 operating hours). If you experience "Flame Failure" lockouts despite a healthy-looking flame, it is likely the UV cell inside the QRA10.C needs replacement. Always ensure the quartz glass window is clean; a thin film of oil can block UV light entirely.

ENERGY COMBUSTION, Ahmadabad

Importer and suppliers of Siemens make Flame Sensors.

The Siemens QRA2 is a compact ultraviolet (UV) flame detector designed for intermittent operation (systems that shut down at least once every 24 hours). It is one of the most common sensors in the Siemens lineup, widely used for supervising gas flames, yellow/blue oil flames, and verifying ignition sparks.

The QRA2 series is identified by its terminal cover color, which indicates its sensitivity level:

• QRA2 (Black Cover): Normal sensitivity.

• QRA2M (Green Cover): High sensitivity, used for smaller flames or longer viewing distances.

• QRA2.9: Features a heat-resistant housing for short-term ambient temperatures up to 200 °C.

• QRA2: Basic unit without mounting flange or clamp.

• QRA2(1): Supplied with a mounting flange and clamp.

• QRA2(2): Specifically refers to the plastic housing variant (standard).

The QRA2 is highly versatile and works with almost all Siemens/Landis & Staefa control boxes. In some cases, an ancillary unit (adapter) is required to convert the signal:

• Direct Connection: LFL, LAL, LGI16, LGK16.

• With Adapter AGQ1/AGQ2/AGQ3: LGB2, LGB4, LMG, LME21, LME22, LME39, LMV2, LMV3.

• Static Charge: The plastic housing is "metallized" (coated) to prevent the build-up of static electricity caused by the air flow from the burner fan. Do not paint over this housing.

• Interference: Like all UV sensors, the QRA2 can be triggered by UV radiation from sources other than the flame, such as ignition sparks, welding arcs, or high-intensity halogen lamps. Ensure it is aimed strictly at the flame.

• Mounting Torque: When tightening the housing screws, the maximum torque is 0.3 Nm

ENERGY COMBUSTION, Ahmadabad supplying all types of Siemens make Flame Sensors.

The Siemens QRI2B2.B180B is an infrared (IR) flame detector designed for use with Siemens burner controls, specifically the LMV5 series. Unlike the UV-based QRA53, this sensor detects the infrared radiation of a flame, making it ideal for gas, oil, and coal flames that produce a strong IR signature.

•  Continuous Operation: Features electronic self-supervision, allowing it to be used for burners that run for more than 24 hours without a shutdown (continuous operation).

• Integrated Amplifier: The flame signal is amplified directly within the detector housing, allowing for a stable 0–5 V signal output.

• Selective Sensitivity: It is designed to ignore constant radiation (like glowing refractory brickwork) and mains frequency harmonics (50/60 Hz). It specifically looks for the "flicker" frequency of a real flame.

• Mounting: It is typically secured to the burner using a flange and clamp. Because of its high sensitivity, it is usually installed behind the burner's baffle plate.

   

The main difference between the models in this series is the direction from which the sensor "sees" the flame:

• QRI2A: Frontal illumination (the sensor looks straight out the tip).

• QRI2B: Lateral illumination (the sensor looks out the side at a 90° angle).

Since this is an IR detector, it is sensitive to heat sources. To avoid false "flame present" signals, ensure it is not exposed to modulated IR radiation from moving hot parts or air turbulence that might cause hot surfaces to "shimmer" in a way that mimics a flame's flicker.

Energy combustion, Ahmedabad Importer and suppliers of Siemens Brand Flame sensor.

Siemens offers several types of infrared (IR) flame sensors, each designed for specific burner controls and fuel types. While they all use IR technology, they differ significantly in their application—ranging from basic oil burner monitoring to high-end industrial burner management.

The QRI series is designed for high-capacity burners and is typically used with the LMV5 series burner controls. It is suitable for continuous operation (24+ hours) and can supervise gas, oil, or coal flames.

• Models:

  • QRI2A: Frontal illumination (looks straight ahead).

  • QRI2B: Lateral illumination (90° side-view).

• Key Specs: DC 0–5 V signal output, electronic self-supervision, and a spectral sensitivity peak at approx. 2 $\mu$m.

• Best For: Industrial burners where reliability and continuous operation are critical.

The QRB series uses photo-resistive sensors. These are primarily used for intermittent operation (burners that shut down at least once every 24 hours) and are designed to monitor yellow-burning oil flames.

• Models: QRB1, QRB3, and QRB4.

• Compatibility: Works with LAL, LME, LMO, and LOA burner controls.

• Detection: Monitors the visible light spectrum of the flame.

• Best For: Standard residential or commercial oil burners.

Unlike the QRI and QRB which sit inside a burner, the FDF series (like the FDF241-9) are wide-area flame detectors used for facility fire protection.

• Technology: Uses Triple-IR (IR3) technology (three pyroelectric sensors) to distinguish between real fires and sources of interference like sunlight.

• Application: Monitoring large industrial rooms, hangars, or chemical storage for open flames.

We are appreciated for providing our valued patrons with Ultra Violet Cells. Sourced from the distinguished manufacturers of the industry, these offered sensors satisfy illustrated parameters of the industry. Furthermore, we have made the offered sensors available in different specifications suited to the divergent demands of the clients. these offered products are appropriate for all types of furnaces, where working temperature is above 500⁰ C.

ENERGY COMBUSTION, Ahmadabad supplying all types of Siemens make Flame Sensors.

The Siemens QRA55 is a high-end ultraviolet (UV) flame detector designed for continuous operation (systems running for 24 hours or more without shutdown). It is nearly identical in function to the QRA53, but it features a shorter detector tube length.

The QRA55 includes a built-in self-checking mechanism (a motorized shutter) that periodically blocks the UV cell to ensure it has not failed in a "flame-on" state.

The suffixes for the QRA55 indicate the voltage and sensitivity level:

• QRA55.E17: 100–110 V AC, Normal Sensitivity

• QRA55.E27: 220–240 V AC, Normal Sensitivity

• QRA55.G17: 100–110 V AC, High Sensitivity

• QRA55.G27: 220–240 V AC, High Sensitivity

• Self-Checking Shutter: An internal stepper motor drives a shutter that tests the UV cell's functionality continuously. This is mandatory for industrial burners that do not cycle daily.

• Rugged Design: The aluminum housing is highly durable and carries an IP65 rating, making it suitable for demanding industrial environments.

• Short Tube Advantage: The 69 mm length is ideal for compact burner configurations where a standard 125 mm sensor (like the QRA53) would be too long.

• Compatible Controls: Primarily used with the LGK16 and LGI16 burner management systems.

1. Connecting Cable: This sensor requires the AGM19 connecting cable.

2. Mounting: It is typically mounted using the supplied clamp. For high-temperature protection, it is often paired with the AGG06 glass holder.

3. Signal Transmission: Because the signal is low-voltage/low-current, the detector cable should never be run in the same conduit as high-voltage ignition cables or motor power lines to avoid interference.

The UV cell inside the QRA55 is a consumable part. After approximately 10,000 hours, the cell will lose its "quenching" ability, leading to false flame signals or burner lockout. You can replace just the internal tube (AGR4 502 4065 0) rather than the entire detector to save on maintenance costs.

ENERGY COMBUSTION, Ahmadabad supplying all types of Siemens make Flame Sensors.

The Siemens QRI2A2.B180B is a high-precision infrared (IR) flame detector designed for use with the LMV5... burner management system. Its defining feature is frontal illumination, meaning the sensor "looks" straight ahead out of the tip of the housing.

• Electronic Self-Supervision: Because it monitors its own internal circuitry, it is approved for burners in continuous operation (running more than 24 hours without shutdown).

• Integrated Amplifier: The flame signal is processed and amplified within the detector head itself, ensuring a stable signal transmission to the control unit.

• Flicker Sensitivity: The sensor is designed to ignore the steady glow from hot refractory bricks. It specifically triggers on the characteristic flicker frequency of an active flame.

• Sensitivity Positioning: Due to its high sensitivity, it is usually installed behind the burner's baffle plate to avoid oversaturation.

The QRI2A2.B180B is typically secured using a flange and clamp system.

• Standard Accessories: (Often sold separately unless specified as a kit)

  • AGG2.110: Mounting set (includes a flange, clamp, and heat insulator).

  • AGG2.120: Adapter for conduit connection.

• Mounting Position: Must be aligned so the frontal lens has a clear line of sight to the flame.

Safety Warning: Infrared sensors can be sensitive to moisture and soot. Ensure the lens is cleaned regularly with a soft, dry cloth. Never use solvents or chemical cleaners, as they can degrade the plastic lens or housing.

ENERGY COMBUSTION, Ahmadabad supplying all types of Siemens make Flame Sensors.

The Siemens QRA10M.C is the high-sensitivity version of the industrial QRA10 series. It is housed in a heavy-duty die-cast aluminum casing and is designed for intermittent operation (systems that cycle at least once every 24 hours).

While it shares the same physical build as the standard QRA10.C, the "M" designation indicates it is equipped with a more sensitive UV cell, making it suitable for applications where the flame signal might be weak.

The primary distinction is the internal UV tube. Because the QRA10M.C is highly sensitive, it is often used in situations where the detector must be mounted further away from the flame or where the viewing path is partially obstructed.

• QRA10.C (Standard): Uses the AGR4 502 1131 0 cell.

• QRA10M.C (High): Uses the AGR4 502 4065 0 cell (same as the QRA2M).

• Cooling Air: Includes a lateral 1/8" tapping for cooling air, which helps keep the lens clean from soot and prevents the internal electronics from overheating.

• Mounting Coupling D: This threaded socket is usually supplied with the unit and allows it to be screwed directly onto a 1" viewing tube or attached to a ball head (AGG07).

• Interference Warning: High-sensitivity sensors are even more susceptible to false signals from ignition sparks, welding arcs, or X-rays. Proper shielding and aiming are critical to prevent "simulated flame" lockouts.

The QRA10M.C works with most Siemens control boxes, but its high sensitivity signal often requires specific auxiliary modules for compatibility:

• Direct Connection: LFL, LAL, LGI16, LGK16.

• With Adapter (AGK30/AGQ1): LFS1.2, LME series, LMV2/3.

Maintenance Note: The UV cell is a consumable item with a lifespan of roughly 10,000 hours. If you notice the burner failing to detect a flame that is clearly visible, the UV tube likely needs replacement.

The Siemens QGO20.000D27 is a specialized zirconium dioxide oxygen (O2) sensor used for combustion optimization in industrial burner systems. It measures the residual oxygen content in flue gases to help burner controls (like the LMV52) adjust the fuel-air ratio for maximum efficiency.

• Oxygen Trim Control: When paired with an LMV52 burner control and a PLL52 O2 module, it allows for "O2 trim," which automatically compensates for changes in air pressure, temperature, or fuel quality.

• Self-Heating: The sensor includes an internal heating element to bring the zirconium dioxide cell to its required operating temperature ($700$ °C).

• Construction: It features a stainless steel sensor tube and a die-cast aluminum connecting head. It is resistant to the aggressive substances typically found in gas and light oil flue gases.

• Service Life: This is a wearing part. Its lifespan depends on the flue gas composition (sulfur, silicon, and heavy metals like lead can shorten its life).

The QGO20 requires a shielded 6-core cable for signal transmission. It is recommended to use twisted-pair wiring (e.g., LifYCY 3 x 2 x 0.2) to prevent electrical interference.

• B1/B2: Signal from the measuring cell and thermocouple.

• Q4/Q5: Mains power for the sensor heating element.

• Note: The shielding must be connected to the GND terminal of the PLL52 module, not to the protective earth.

• Orientation: The sensor should be installed horizontally or vertically, but never in a way that allows condensation to collect in the sensor tube.

• Heating Phase: Upon first commissioning or after a long shutdown, the sensor should be powered on for approximately 2 hours before the burner is started to allow it to reach thermal equilibrium.

• Forbidden Substances: Avoid fuels containing silicon, halogens, or heavy metals, as these will "poison" the zirconium cell and cause premature failure.

NERGY COMBUSTION, Ahmadabad supplying all types of Siemens make Flame Sensors.

The Siemens QRI2B2.B180B is an infrared (IR) flame detector designed for use with Siemens burner controls, specifically the LMV5 series. Unlike the UV-based QRA53, this sensor detects the infrared radiation of a flame, making it ideal for gas, oil, and coal flames that produce a strong IR signature.

•  Continuous Operation: Features electronic self-supervision, allowing it to be used for burners that run for more than 24 hours without a shutdown (continuous operation).

• Integrated Amplifier: The flame signal is amplified directly within the detector housing, allowing for a stable 0–5 V signal output.

• Selective Sensitivity: It is designed to ignore constant radiation (like glowing refractory brickwork) and mains frequency harmonics (50/60 Hz). It specifically looks for the "flicker" frequency of a real flame.

• Mounting: It is typically secured to the burner using a flange and clamp. Because of its high sensitivity, it is usually installed behind the burner's baffle plate.

   

The main difference between the models in this series is the direction from which the sensor "sees" the flame:

• QRI2A: Frontal illumination (the sensor looks straight out the tip).

• QRI2B: Lateral illumination (the sensor looks out the side at a 90° angle).

Since this is an IR detector, it is sensitive to heat sources. To avoid false "flame present" signals, ensure it is not exposed to modulated IR radiation from moving hot parts or air turbulence that might cause hot surfaces to "shimmer" in a way that mimics a flame's flicker.