Siemens QRI2B2.B180B1 Migration-Ready Infrared Flame Detector

Overview

Siemens QRI2B2.B180B1 Migration-Ready Infrared Flame Detector: Legacy System Retrofit and Compatible Upgrade

The Siemens QRI2B2.B180B1 is a high-reliability infrared flame detector engineered for direct integration into Siemens QRI Series burner management and combustion control systems. Designed to serve as a drop-in replacement for discontinued or end-of-life flame sensing components, the QRI2B2.B180B1 is a critical spare part for facilities managing aging burner control infrastructure across industrial boilers, process heaters, and thermal oxidizers.

When planning a retrofit or spare parts replenishment for legacy Siemens burner control panels, engineers must verify several key parameters before commissioning the QRI2B2.B180B1. Power supply compatibility — typically 100–240 VAC or 24 VDC depending on the control unit — must be confirmed against the existing Siemens LME or LMO series burner controller. Terminal wiring assignments on the detector base must match the original installation drawing; the QRI2B2.B180B1 uses a standard QRI bayonet-mount base, which is mechanically compatible with most legacy QRI detector sockets already installed in the field. No base replacement is required in the majority of retrofit scenarios, significantly reducing installation time and downtime exposure.

For systems running Siemens LME11, LME21, LME22, or LME41 burner controllers, the QRI2B2.B180B1 integrates without firmware modification. The detector’s infrared sensing range and response time characteristics are factory-calibrated to meet the flame signal thresholds expected by these controllers. Where the existing system uses an older QRI2… variant with a different spectral sensitivity suffix, engineers should cross-reference the B180B1 spectral angle (180°) and confirm it matches the burner geometry and flame envelope of the application. In multi-burner configurations using a Siemens RWF55 or RWF10 modulating controller, the flame signal output from the QRI2B2.B180B1 feeds directly into the burner controller’s ionization or infrared input — no signal conditioning or additional relay interface is required.

Facilities upgrading from older Siemens QRB1 or QRB3 ultraviolet/infrared combination detectors to the QRI2B2.B180B1 infrared-only design should note that the QRI series is optimized for oil-fired and gas-fired burners where infrared detection provides superior immunity to UV interference from ambient light sources. This transition is common in retrofit projects where the original QRB-series detector has reached end-of-life and the replacement strategy prioritizes long-term parts availability and reduced false-trip sensitivity.

During system migration, the Siemens AGG5.610 detector cable assembly and the QAA2.J12 detector base are frequently ordered alongside the QRI2B2.B180B1 to ensure a complete, tested assembly is available on-site before the maintenance window begins. Pre-staging all components — detector, base, and cable — eliminates the risk of discovering a worn base socket or damaged cable during the shutdown, which would extend unplanned downtime. Each QRI2B2.B180B1 unit shipped from our inventory undergoes pre-shipment functional verification to confirm infrared sensitivity, output signal integrity, and mechanical fit before dispatch.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful QRI2B2.B180B1 retrofit begins with a complete bill-of-materials review for the burner control cabinet. Beyond the detector itself, maintenance teams should audit the condition of the QAA2.J12 detector base for contact wear, inspect the AGG5.610 detector cable for insulation degradation, and verify that the Siemens LME or LMO burner controller’s flame amplifier circuit is functioning correctly — a faulty amplifier will reject a valid flame signal from even a new detector. In systems where the burner controller itself is approaching end-of-life, a parallel upgrade to a Siemens LME41.050A2 or LME22.331A2 controller may be advisable to extend the operational life of the entire burner management system.

For facilities operating multiple burner zones controlled by a Siemens RWF55.50A9 modulating controller or a building management system via BACnet or Modbus, the flame detector retrofit does not affect the communication layer — the QRI2B2.B180B1 operates entirely within the burner controller’s local signal loop. This simplifies the retrofit scope and eliminates the need for any PLC program modification or HMI screen update related to the flame detection function. However, if the HMI displays a flame status signal derived from the burner controller’s digital output, commissioning staff should verify that the new detector’s signal strength is sufficient to trigger the controller’s flame-proven output within the expected response time window.

Downtime Control During System Migration

Minimizing production downtime during a flame detector replacement requires pre-staging all components, preparing a wiring reference drawing from the original installation, and scheduling the swap during a planned maintenance window rather than responding reactively to a detector failure. The QRI2B2.B180B1’s bayonet-mount design allows detector exchange in under five minutes once the burner is safely shut down and the controller is de-energized. Original program logic in the Siemens LME or LMO controller is stored in non-volatile memory and is not affected by detector replacement — no re-programming is required.

After installation, the commissioning sequence involves energizing the burner controller, initiating a controlled burner start, and confirming that the flame signal LED on the LME/LMO controller illuminates within the detector’s rated response time. If the controller enters lockout, the most common causes are insufficient flame signal strength (verify detector alignment with the flame envelope) or a worn detector base with poor contact resistance. Keeping one QRI2B2.B180B1 unit in on-site inventory as a cold standby eliminates the risk of extended downtime caused by lead-time delays on emergency orders.

Retrofit Support FAQ

Q: Is the QRI2B2.B180B1 a direct replacement for my existing QRI2… detector?
A: In most cases, yes. The QRI2B2.B180B1 is mechanically and electrically compatible with the standard QRI bayonet-mount base and is designed for use with Siemens LME and LMO series burner controllers. Confirm the spectral suffix (B180B1 = 180° infrared) matches your burner geometry before ordering.

Q: Do I need to modify the wiring or terminal assignments when installing the QRI2B2.B180B1?
A: No wiring changes are required when replacing a like-for-like QRI series detector. The detector connects via the existing QRI base; terminal assignments on the base remain unchanged. If upgrading from a QRB-series detector, a base change and wiring review are required.

Q: Has the QRI2B2.B180B1 been tested before shipment?
A: Yes. Every unit undergoes pre-shipment functional verification covering infrared sensitivity, output signal integrity, and mechanical fit. Units are shipped with a support terms confirmed by quotation covering manufacturing defects from the date of delivery.

Q: What is the lead time and inventory availability?
A: The QRI2B2.B180B1 is held availability confirmed by RFQ for immediate dispatch. For volume orders or long-term supply agreements (12–36 months), contact our sales team to discuss reserved inventory arrangements and scheduled delivery programs.

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