Flame Detector Replacements
Upgrade paths for discontinued flame sensors from Honeywell and Siemens, ensuring safety and compliance.
Configuration Mismatch Risk
Although replacements like C7027A/C7061A may fit physically ("Direct Mechanical Interchange"), they often require specific amplifiers (e.g., R7849 vs R7861) based on Intermittent vs. Continuous operation. Mismatched components can lead to false alarms or failure to detect flame loss.
Replacement List
| Brand | Discontinued Model | End of Life | Official Replacement | Key Differences | Interchange? | Action / Advice |
|---|---|---|---|---|---|---|
| Honeywell | C7927 (Solid State UV) | 2022-12-30 | C7027A (Powertube UV) | Mechanical: Same housing (no mech mod). Electrical: Needs R7849 (Intermittent) for 7800 Series or R8001S1071 for SLATE. | Conditional | Must lock in Amplifier Model + Operation Mode (Intermittent/Continuous) to avoid false alarms. |
| Honeywell | C7961E/F (Self-Check UV) | 2022-12-30 | C7061A/F (Powertube UV, Self-Check) | Mechanical: Same housing. Electrical: Needs R7861 (Continuous) for 7800 Series or R8001S1051 for SLATE. Check ATEX/UL. | Conditional | For hazardous areas, strictly verify ATEX/UL zones and specific sub-models. |
| Honeywell | IFW-15 (Intermittent) | 2022-12-30 | Honeywell Kromschröder FDU Series | FDU is new generation. Requires wiring/parameter matching. OEM approval suggested. | Conditional | Select FDU 510/520 based on operation mode (intermittent/continuous) and sensor type (Ion/UV). |
| Honeywell | IFW-50 (Continuous) | 2022-12-30 | Honeywell Kromschröder FDU Series | Same as above. For continuous operation. | Conditional | Prioritize FDU 520 (Continuous) and perform threshold/response time tests. |
| Honeywell | R4343 (Flame Switch) | 2022-12-30 | Honeywell Kromschröder FDU Series | Compliance Risk: R4343 does NOT meet new EU requirements (GAR/LVD/EMCD). Replacement only. | Conditional | Do NOT use R4343 for new EU/UK installations. Migrate existing units to FDU. |
| Honeywell | C7076F (Hazardous UV) | Discontinued Soon | U2-101xS-PF Series | Functional replacement (UV/IR). Requires system-level signal/setting adjustment. | Conditional | Hazardous areas must verify Sensor + Amplifier/Controller certification package. |
| Siemens | QRB1A-A050B70A | Discontinued | Likely QRB4 (Verify) | No official map. QRB4 is common for oil yellow flame. Verify suffix (length/plug). | Conditional | Check exact suffix. Obtain OEM confirmation. |
| Siemens | QRB3(1) | Discontinued | Likely QRB4 (Verify) | No official map. Engineering review required. | Conditional | Perform functional tests (extraneous light, response time) and document results. |
Priority Procurement & Maintenance Advice
- Honeywell C7927/C7961: Lock in the "Controller Platform + Amplifier Model + Operation Mode" as a single BOM item.
- Regulatory Compliance: R4343 and older relays may not meet current EU standards. New installations in regulated regions should migrate directly to the FDU Series.
- Siemens QRB Series: Do not rely solely on visual similarity. Verify the exact suffix and obtain OEM approval before use.