C7061A1020 Honeywell UV Flame Detector with Oscillating Shutter
Product Introduction
The C7061A1020 belongs to Honeywell’s C7061 series of ultraviolet flame detectors. It is specifically designed for dynamic self-checking applications. An oscillating shutter interrupts the UV radiation reaching the sensor tube. This action provides continuous verification of the detector’s functionality. You must use this detector with the R7861 dynamic self-check amplifier. Together, they monitor gas, oil, or other fuel combustion. The C7061A1020/U operates on either 120V or 230V power at 50 or 60 Hz. Its rugged construction includes a protective heat block in the mounting flange. A -40°F (-40°C) rated UV sensing tube comes standard.
Technical Specifications
Electrical Ratings
The C7061A1020 accepts dual voltage input. Specifically, you can power it with 120V or 230V AC. Frequency options include both 50 Hz and 60 Hz. Electrical connections use a terminal block inside the housing. This terminal block simplifies field wiring. Power consumption remains low, although exact VA ratings depend on the connected R7861 amplifier.
Shutter Mechanism and Self-Checking Operation
A key feature of the C7061A1020 is its oscillating shutter. This mechanical shutter moves periodically. It physically blocks UV radiation from reaching the sensor tube. Because the shutter interrupts the light path, the detector cannot see the flame for a brief moment. The R7861 amplifier expects this temporary signal loss. If the signal does not drop when the shutter closes, the amplifier detects a fault. Therefore, the system verifies that the UV tube is not stuck in a false “flame on” state. This dynamic self-checking happens continuously during burner operation.
Optical and Mechanical Design
The detector requires proper faceplate alignment. Integral locating reference points are built into the C7061A1020. These points ensure correct operation of the shutter mechanism. A field-replaceable quartz viewing window protects the UV sensor. Additionally, the UV sensing tube itself can be replaced in the field. This modular design reduces maintenance downtime. The mounting flange includes a protective heat block. Consequently, the detector withstands radiant heat from boilers and furnaces.
Mounting Flexibility and NEMA Rating
You can mount the C7061A1020 horizontally, vertically, or at any angle in between. The threaded conduit fitting uses standard 3/4 inch NPT threads. Color-coded lead wires speed up electrical installation. This model meets NEMA 4 standards. Therefore, it resists water splashes, hose-directed water, and falling dirt. Note that the C7061F variant offers explosion-proof housing, but this C7061A1020 is the standard NEMA 4 version.
Environmental and Physical Parameters
Temperature Range
The C7061A1020 operates reliably from -40°C to +79°C (-40°F to +174°F). The supplied UV sensing tube is rated for -40°C. Consequently, this detector works in cold climates and freezer applications. High-temperature boiler rooms also fall within its operating range.
Dimensions and Weight
Dimensions are approximately 133 mm in diameter (including the mounting flange) by 183 mm in length. Shipping weight is 3.0 kg. The body is robust enough for industrial environments.
Approvals and Compliance
This detector carries Swiss RE acceptability. It meets NEMA 4 environmental standards. For hazardous locations, refer to the C7061F model instead. The C7061A1020 is suitable for NFPA-compliant burner management systems.
Parallel Wiring for Nuisance Shutdown Reduction
Two C7061A1020 detectors can be wired in parallel. This configuration reduces nuisance shutdowns in difficult flame sighting applications. For instance, when flame characteristics vary or viewing angles are poor, parallel detectors provide redundancy. If one detector momentarily loses sight, the other continues to confirm flame presence. Always refer to the R7861 amplifier manual for proper parallel wiring methods.
Connector Note
The C7061A1020/U does not use a Brad Harrison type connector. Models C7061A1038 and C7061A1046 use a 5-pin Brad Harrison (formerly 41307N) mating connector. However, that connector is not supplied with the C7061A1020. Furthermore, Honeywell does not sell that connector separately. For this specific model, wiring connects directly to the terminal block.
Frequently Asked Questions (FAQ)
1. Which amplifier works with the C7061A1020?
The C7061A1020 must be used with a Honeywell R7861 dynamic self-check flame amplifier. Other amplifiers are not compatible.
2. How does the oscillating shutter self-check work?
The shutter periodically blocks UV light from reaching the sensor. The R7861 amplifier expects a momentary signal loss. If the signal remains present, a fault is declared.
3. Can I mount this detector facing downward?
Yes. The C7061A1020 mounts horizontally, vertically, or at any angle. Ensure proper faceplate alignment for shutter operation.
4. What is the maximum ambient temperature for operation?
The C7061A1020 operates reliably from -40°C to +79°C (-40°F to +174°F). The heat block protects against radiant heat.
5. Can I use two detectors on one burner?
Yes. Wire two C7061A1020 detectors in parallel. This arrangement reduces nuisance shutdowns in difficult flame sighting applications.
