Description
The Honeywell C7061A1053 is a dynamic self-checking ultraviolet (UV) flame detector designed for use with industrial burner management systems (BMS). It senses the ultraviolet radiation emitted by combustion flames (such as oil, gas, or coal fires) and works in tandem with Honeywell flame safeguard controls (such as the RM7800 series) to provide continuous, high-reliability flame monitoring in industrial boilers and process furnaces. The “Purple Peeper” nomenclature derives from its distinctive purple cast-aluminum housing.
Technical Specifications
| Parameter | Value / Specification |
| Model Number | C7061A1053 |
| Brand | Honeywell |
| Detector Type | Ultraviolet (UV), Dynamic Self-Checking |
| Operating Voltage | 120 V AC (+10% / −15%), 50 / 60 Hz |
| Power Consumption | 2.5 W maximum |
| Mounting Connection | 1-inch NPT (National Pipe Thread) tapping |
| Electrical Connection | NEC Class 1 conduit connection, 8-foot (2.4-meter) color-coded lead wires |
| Spectral Range | 185 to 260 nanometers (UV-A / UV-B boundary) |
| Self-Checking Frequency | 60 to 100 cycles per minute (driven by an internal shutter) |
| Enclosure Rating | NEMA 4 (IP65 equivalent), explosion-proof or standard depending on final assembly |
| Ambient Temperature Range | −40 to +79°C (−40 to +175°F) |
| Pressure Rating | Up to 5 psi (34.5 kPa) at the quartz viewing window |
| Approvals / Certifications | UL Listed, CSA Certified, FM Approved |
Commercial and Logistics Terms
- Condition: New Original (Factory Sealed)
- Warranty: 12-Month Comprehensive Warranty
- Availability: In Stock / Available for Order
- Lead Time: Ships within 1 to 2 business days from order confirmation
- Pricing: Price subject to market conditions; contact us for a firm quote
Engineering Overview & Integration Notes
In high-capacity combustion applications, safety standards like NFPA 85 dictate continuous-burn flame monitoring. The C7061A1053 fulfills this via its active optical shutter mechanism, differentiating it from standard non-checking UV detectors (like the C7027A).
Dynamic Self-Checking Mechanism
A standard UV tube can fail in a “short circuit” state, falsely indicating the presence of a flame when none exists (a dangerous unsafe failure mode).
- The C7061A1053 integrates an oscillating mechanical shutter driven by the 120 V AC line frequency.
- The shutter blocks the UV sensor’s line of sight roughly once per second.
- The paired Flame Safeguard controller monitors this modulation. If the controller fails to register the interruption of the flame signal during the shutter block phase, it recognizes a tube fault or electronic failure and safely triggers an emergency burner shutdown.
Installation & Sight Pipe Alignment
Proper alignment is critical to ensure a high signal-to-noise ratio and prevent nuisance trips:
- Line of Sight: Focus the detector on the root of the flame—the intersection of the burner nozzle and the primary air stream—where the UV emission is most concentrated. Do not aim it at the secondary combustion zone or glowing refractories.
- Refractory Glow: While UV sensors are immune to standard infrared radiation from hot brickwork, extreme temperatures (above +1371°C / +2500°F) can emit trace UV rays. Proper aiming prevents the sensor from tracking background radiation.
- Purge Air Setup: Connect a clean, dry, oil-free low-pressure air purge line to the sight pipe assembly if the process involves heavy soot, coal dust, or moisture. This keeps the quartz viewing window free of film buildup that attenuates UV light.
Field Note: The internal UV sensing tube degrades gradually over thousands of operating hours. If the flame signal amplitude declines on your RM7800 display unit despite a clean quartz lens and verified alignment, the tube is reaching its end-of-life curve. Replace the internal tube plug-in assembly during scheduled burner maintenance.
Frequently Asked Questions
Can I replace a C7027A “Mini-Peeper” directly with a C7061A1053?
No. The C7027A is a smaller, non-self-checking detector that runs on different electronics and physical mounting sizes (1/2-inch NPT vs. 1-inch NPT). Upgrading to the C7061A1053 requires changing the burner sight pipe diameter and replacing the flame amplifier module inside the control cabinet with a self-checking amplifier (such as the R7847C).
What is the purpose of the quartz window on the C7061A1053?
The quartz window isolates the internal electronics and UV tube from combustion chamber pressures and corrosive gases while allowing UV radiation to pass unimpeded. Do not replace it with standard tempered plate glass, as ordinary glass blocks ultraviolet light wave bands completely and will prevent the system from detecting a flame.
How do I troubleshoot a “Shutter Fault” alarm code on the primary controller?
Verify that the C7061A1053 is receiving full 120 V AC power on its drive leads and listen closely for the faint click of the shutter mechanism. If the shutter is seized due to mechanical damage, physical shock, or exposure to temperatures exceeding +79°C (+175°F), the entire shutter drive assembly or the detector unit must be replaced.
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