Description
HONEYWELL R7247C1001
HONEYWELL R7247C1001 is an industrial flame safeguard control module from Honeywell’s combustion control product line, specifically designed for monitoring and protecting gas, oil, or dual-fuel combustion systems (such as boilers, furnaces, and heaters) in PLC-based automation setups. Its core function is to verify flame presence, detect ignition failures, and trigger safety shutdowns in case of anomalies—acting as a critical “safety barrier” to prevent combustion-related hazards like gas leaks or explosions. Compatible with most industrial PLCs (e.g., Siemens S7-1200, Allen-Bradley Micro800), HONEYWELL R7247C1001 seamlessly integrates into combustion control loops, ensuring compliance with global safety standards (e.g., NFPA 85, EN 746-2).
Product Description
HONEYWELL R7247C1001 belongs to Honeywell’s R7200 series of flame safeguard controls, engineered for heavy-duty industrial combustion applications. It uses ultraviolet (UV) flame detection technology—capable of distinguishing true flame signatures from ambient light (e.g., incandescent bulbs, hot surfaces) to avoid false alarms, a key advantage over infrared (IR) detectors in high-temperature environments. The module features a built-in ignition timing control function: it automatically manages the pre-purge (to remove unburned fuel), ignition trial, and flame verification phases, reducing the need for additional PLC programming.
Additionally, HONEYWELL R7247C1001 includes a lockout function—if ignition fails three consecutive times, the module locks out and sends a fault signal to the PLC, preventing repeated ignition attempts that could accumulate unburned fuel. Its compact DIN-rail mount design allows easy installation in control panels alongside PLCs, relays, and fuel valves. In practical use, HONEYWELL R7247C1001 is often paired with Honeywell’s C7027 UV flame sensors to form a complete safety loop: the sensor detects flame, transmits signals to the module, and HONEYWELL R7247C1001 processes the data to control fuel valve activation or shutdown via the PLC.
Technical Specifications
- Product Type: Industrial flame safeguard control module (UV flame detection)
- Flame Detection Technology: Ultraviolet (UV) sensor compatibility (works with Honeywell C7027/C7035 series UV sensors)
- Compatible Fuels: Gas (natural gas, propane), oil (diesel, heavy oil), and dual-fuel combustion systems
- Safety Functions: Pre-purge timing (adjustable 0–300 seconds), ignition trial timing (adjustable 1–60 seconds), flame verification, lockout (3 consecutive failure lockout)
- Input Signals:
- UV flame sensor signal (24V DC, 5mA max)
- PLC start/stop control signal (dry contact input)
- Output Signals:
- Fuel valve control (2 SPDT relays, 5A/250V AC max)
- Fault signal to PLC (dry contact output, normally open)
- Power Supply: 24V DC (±10% tolerance), current consumption ≤ 100mA (no load)
- Operating Temperature Range: -40°C to +60°C (suitable for harsh industrial environments)
- Storage Temperature Range: -40°C to +85°C
- Enclosure Rating: IP20 (must be installed in a closed control cabinet)
- Dimensions: 35mm (W) × 100mm (H) × 75mm (D) (DIN-rail mount size)
- Weight: Approximately 150g
- Safety Certifications: UL 372, CSA C22.2 No. 213, EN 60730-1 (complies with global combustion safety standards)
- Model Number: HONEYWELL R7247C1001 (Honeywell official part number)
Advantages and Features
- Reliable UV Flame Detection: HONEYWELL R7247C1001 uses UV technology to detect flame, which is not affected by ambient temperature or hot surfaces—unlike IR detectors, it avoids false shutdowns in high-temperature furnaces or boilers.
- Integrated Safety Logic: Built-in pre-purge, ignition trial, and lockout functions reduce PLC programming complexity; the module autonomously manages combustion startup sequences, minimizing human error in safety loop design.
- Wide Environmental Tolerance: -40°C to +60°C operating temperature range enables use in outdoor boilers (cold climates) or high-temperature industrial furnaces, ensuring consistent performance in extreme conditions.
- Easy PLC Integration: Dry contact inputs/outputs simplify connection to PLC digital I/O modules—no specialized communication protocols are required, allowing quick integration into existing automation systems.
- Global Safety Compliance: Certifications like UL 372 and EN 60730-1 ensure HONEYWELL R7247C1001 meets safety requirements for combustion systems in North America, Europe, and Asia, avoiding compliance risks in global projects.
Application Fields and Cases
- Power Generation (Boiler Control): In a coal-fired power plant’s auxiliary gas-fired boiler, HONEYWELL R7247C1001 is paired with a UV sensor to monitor the pilot flame. When the PLC sends a “start” signal, the module initiates a 60-second pre-purge, activates the ignition electrode, and verifies flame presence. If no flame is detected within 10 seconds, it shuts off the gas valve and sends a fault signal to the PLC—preventing gas accumulation and potential explosions.
- Food Processing (Oven Combustion): In a bakery’s natural gas-fired tunnel oven, HONEYWELL R7247C1001 ensures flame stability during baking. If the flame is extinguished unexpectedly (e.g., gas pressure drop), the module detects the loss within 200ms, shuts off the gas supply, and alerts the PLC. This prevents unburned gas from contaminating food products and eliminates fire risks.
- Chemical Industry (Heater Safety): In a chemical plant’s oil-fired process heater, the module works with a dual-fuel UV sensor to monitor both pilot and main flames. HONEYWELL R7247C1001’s lockout function prevents repeated ignition attempts if the main flame fails, avoiding fuel buildup in the heater chamber—a critical safety measure for explosive chemical environments.
- Commercial HVAC (Chiller Heaters): In a shopping mall’s chiller system (equipped with gas-fired backup heaters), HONEYWELL R7247C1001 integrates with the building’s BMS (PLC-based) to control heater startup. Its wide temperature tolerance ensures reliable operation in unheated rooftop equipment rooms during winter, maintaining consistent indoor temperatures.
Comparison with Competitors
| Comparison Dimension | HONEYWELL R7247C1001 | Competitor 1 (Siemens LFE10) | Competitor 2 (Schneider TSXETY4103) |
|---|---|---|---|
| Detection Technology | UV (flame-specific) | IR (infrared, sensitive to hot surfaces) | UV/IR dual-tech (higher cost) |
| Safety Functions | Pre-purge, ignition trial, lockout | Pre-purge, ignition trial (no lockout) | Pre-purge, ignition trial, lockout |
| Operating Temperature | -40°C to +60°C | -20°C to +50°C | -30°C to +55°C |
| Output Relays | 2 SPDT (5A max) | 1 SPDT (3A max) | 2 SPDT (4A max) |
| Safety Certifications | UL, CSA, EN | CE, UL | CE, CSA |
| Cost-Effectiveness | High (integrated functions, low maintenance) | Medium (limited temperature range) | High (dual-tech, higher initial cost) |
HONEYWELL R7247C1001 outperforms competitors in environmental tolerance, flame detection reliability, and cost-effectiveness—making it ideal for harsh industrial environments and applications requiring strict safety compliance. Competitors may offer specialized features (e.g., dual UV/IR tech) but at a higher cost or with narrower temperature ranges.
Selection Recommendations and Precautions
Selection Recommendations
- By Fuel Type: Confirm the combustion system uses gas, oil, or dual fuel—HONEYWELL R7247C1001 supports all three, but ensure compatibility with the selected UV sensor (e.g., Honeywell C7027 for gas, C7035 for oil).
- By Environmental Conditions: Choose HONEYWELL R7247C1001 for outdoor or extreme-temperature applications (-40°C to +60°C). For mild environments (indoor, 0°C to +40°C), competitors with lower temperature ranges may be more cost-effective.
- By Safety Requirements: Prioritize HONEYWELL R7247C1001 for systems requiring global certifications (e.g., UL, EN) or lockout functions (to prevent repeated ignition failures).
Precautions
- Sensor Matching: Use only Honeywell-approved UV sensors (e.g., C7027, C7035) with HONEYWELL R7247C1001—non-compatible sensors may cause false alarms or detection failures.
- Wiring Safety: Separate the module’s signal wires (UV sensor, PLC connections) from high-voltage wires (fuel valves, ignition electrodes) to avoid electromagnetic interference.
- Regular Maintenance: Clean the UV sensor lens every 6 months (or as per operating conditions) to remove soot or dust—dirty lenses can block UV signals, leading to false flame loss detections.
- Lockout Reset: After a lockout (3 consecutive failures), reset HONEYWELL R7247C1001 manually (via the module’s reset button) only after troubleshooting the root cause (e.g., gas pressure, ignition electrode). Do not reset without inspection, as this may reintroduce hazards.
R7247C1001
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