Honeywell 05701-A-0301

Product Brief Introduction

• Honeywell 05701-A-0301 is factory pre-calibrated dedicated UV flame signal amplifier developed for industrial burner combustion monitoring systems, exclusively matched with Honeywell UV ultraviolet flame sensing probes to convert weak photocurrent signal from flame detector into standard switch-level control signal for boiler burner safety controller.
• This module executes continuous real-time flame status identification, flame loss fault judgment and safety interlock signal output; it constitutes core flame detection loop together with UV flame sensor and burner safety relay.
• Every finished unit undergoes full functional aging test, sensitivity calibration, insulation withstand voltage test and output contact action verification before factory outbound delivery, each unit is printed with unique serial number to realize full lifecycle traceability management of spare parts.
• The module complies with FM, CSA and UL industrial combustion safety certification standards, designed for fixed DIN rail installation inside combustion control cabinet of gas, oil dual-fuel industrial burners.

3. Technical Specification

• Rated operating input supply voltage: AC 120V, fixed allowable input fluctuation range: AC102V~AC132V
• Rated working frequency: 50Hz / 60Hz dual universal frequency compatibility
• Quiescent no-load operating power consumption: ≤4.2VA under rated AC120V input condition
• Supporting matched flame probe type: Honeywell UV ultraviolet flame detector series (C7035A, C7027A fixed matching models)
• Flame signal input interface: Two-core screw terminal dedicated for UV probe photocurrent signal access
• Control output specification: Single set SPDT mechanical relay contact output, rated contact capacity: 250VAC / 5A resistive load
• Overall outer dimension: 95.3mm(L) × 70.1mm(W) × 112.8mm(H)
• Single module net weight: 0.325kg
• In-cabinet installation protection grade: IP20 complying with IEC60529 specification
• Continuous rated operating ambient temperature range: -20℃ ~ +65℃; extreme storage temperature range: -40℃ ~ +85℃
• Allowable working ambient relative humidity: 5%RH ~90%RH non-condensing, no corrosive gas environment required
• Vibration resistance standard: IEC60068-2-6, continuous anti-vibration 2.5g RMS within 10Hz~500Hz operating frequency band

4. Functional Features

1. Built-in multi-stage photocurrent amplification circuit for weak UV microampere-level current signal transmitted from flame probe, amplifies tiny flame induction signal to reach internal comparison threshold level.
2. Adjustable flame sensitivity trim potentiometer embedded on front panel; users adjust resistance value to modify flame detection threshold adapting different burner flame radiation intensity.
3. Front panel equipped red LED fault indicator and green normal operation indicator; green lamp illuminates when valid flame is detected, red lamp lights upon flame absence or circuit fault.
4. Internal fixed flame failure response time circuit with two built-in fixed timing modes; standard factory preset flame loss response delay: 2 seconds fixed value.
5. Integrated input overvoltage transient suppression circuit at probe signal input terminal, eliminates instantaneous surge voltage induced by long-distance field wiring lightning interference.
6. Bottom integrated DIN35 standard rail buckle structure supporting two installation modes: DIN rail clamping mounting and flat panel screw fixed mounting without additional conversion accessories.
7. Built-in open-circuit/short-circuit self-diagnosis function for flame probe wiring; module triggers fault output once probe cable open or short circuit occurs regardless of actual flame status.
8. Independent isolation design between power input loop and flame signal acquisition loop to cut common-mode interference path caused by cabinet ground potential deviation.

5. Performance Parameter

• Minimum detectable input photocurrent threshold: 0.02μA under rated working condition at 25℃ standard ambient temperature
• Full signal processing total response delay: ≤120ms from valid UV signal input to relay contact pull-in action
• Relay contact mechanical service life: ≥10⁶ times of rated load switching operation under standard environment
• Long-term continuous working drift of amplification circuit: ≤0.03μA per 24-hour uninterrupted powered operation under constant temperature
• Insulation resistance between power circuit and signal input circuit: ≥1200MΩ measured by DC500V megohmmeter under normal environment
• Dielectric withstand voltage between input power terminal and shell ground: AC1500V/1min without breakdown and creepage discharge
• Anti-external ambient light interference capability: Module maintains normal no-fault status under 12000lux visible ambient light irradiation without false flame signal trigger
• Sensitivity adjustment range: 0.02μA ~1.2μA continuous linear regulation via front panel potentiometer

6. Material Composition

Main PCB Circuit Substrate

• PCB base material: FR-4 TG130 flame retardant epoxy glass fiber board with lead-free HASL anti-oxidation surface coating, copper foil fixed thickness 35μm for power layer and 18μm for signal layer.

Outer Plastic Enclosure & Terminal Base

• Shell and wiring terminal insulating pedestal: UL94-V0 flame retardant reinforced PA66 nylon with glass fiber filler injection molding, anti-aging and hydrolysis resistant formulation.

Internal Core Electronic Components

• Signal amplification chip: industrial wide-temperature operational amplifier IC; filter component: high-temperature multilayer ceramic capacitor and polyester film fixed capacitor; protection device: SMD TVS transient voltage suppression diode.
• Front panel adjustable potentiometer: carbon film industrial grade sealed trimming potentiometer with stainless steel adjustment rotating shaft; indicator lamps: epoxy encapsulated LED components.

Wiring Terminal & Fixed Fastener

• Terminal conductive insert: H62 brass with full nickel plating anti-corrosion surface treatment; all internal assembly locking screws: SUS304 stainless steel miniature fasteners.

Output Relay Component

• SPDT control relay housing: engineering plastic sealed shell, internal contact material: silver alloy for anti-arcing long service life.

7. Structural Characteristics

1. Overall three-part split integrated structure: front panel indication & adjustment area, intermediate core PCB circuit cabin, bottom DIN rail fixed base area; three sections fastened with evenly distributed anti-looseness stainless steel screws into a complete unit.
2. Front panel fixed layout: two status indicator LEDs arranged on upper section, sensitivity adjusting potentiometer installed at middle position with exposed rotary knob for external adjustment without shell disassembly.
3. Top side centralized terminal arrangement: three groups independent screw wiring terminals partitioned into power input terminal group, flame probe signal terminal group and relay output terminal group with silkscreen functional marking beside each terminal.
4. Bottom integrated integrated elastic DIN35 rail locking buckle with push-type release mechanism enabling tool-free quick disassembly from standard DIN installation rail.
5. Internal circuit cabin adopts closed dustproof plastic partition structure to block cabinet floating dust falling onto PCB soldering points.
6. Right side blank marking area reserved on outer shell for manual labeling of equipment number and corresponding burner unit number for later maintenance identification.

8. Working Principle

1. After AC120V rated working power accesses module power input terminal, internal power supply conversion circuit outputs stable DC working voltage for whole signal amplification and comparison circuit.
2. UV flame probe converts ultraviolet radiation generated by burner combustion flame into microampere-level DC photocurrent signal, which transmits via two-core shielded cable into module dedicated signal input terminals.
3. Weak photocurrent enters multi-stage fixed gain amplification circuit inside module to complete signal amplitude boosting; amplified signal is delivered to internal threshold comparison circuit for real-time numerical judgment against preset sensitivity value set by front potentiometer.
4. When input signal magnitude exceeds preset threshold, internal drive circuit pulls in built-in SPDT relay, relay contact closes and outputs valid flame existence signal to external burner safety control unit; green status LED keeps steady illuminated synchronously.
5. Once flame extinguishes or probe cable opens/shorts, input photocurrent drops below set threshold; internal timing circuit counts fixed 2-second delay time then cuts relay drive output, relay contact switches to fault state and red fault LED turns on to trigger external burner safety interlock shutdown action.
6. Built-in surge suppression component absorbs abnormal peak pulse voltage from power grid or field long-distance cable transient interference to prevent abnormal circuit misjudgment and false flame fault output.

9. Advantage Highlights

1. Standard matching design for Honeywell original UV flame probe series eliminates signal mismatch risk caused by non-original third-party amplifier replacement, guaranteeing consistent factory-calibrated detection precision.
2. Onboard adjustable sensitivity potentiometer realizes flexible threshold setting adapting multiple fuel types including natural gas, diesel, heavy oil and mixed fuel burner working conditions.
3. Built-in probe line open/short automatic diagnosis function reduces hidden safety hazard caused by field wiring aging damage without additional external detection accessories.
4. Fixed 2-second flame loss delay design conforms to global mainstream industrial boiler combustion safety standard specification, avoiding unnecessary burner shutdown induced by instantaneous flame flicker.
5. Wide-temperature component selection enables stable continuous operation within -20℃~+65℃ without auxiliary cabinet cooling fan under conventional combustion control cabinet environment.
6. DIN rail quick-install structure shortens field replacement construction period; faulty module can be directly pulled out and replaced without modifying field flame probe wiring layout.
7. Dual-color independent status indicator design enables on-site maintenance personnel to rapidly judge fault root cause between actual flameout and circuit wiring failure.

10. Applicable Industries

• Thermal Heating Industry: Industrial hot water boiler, steam boiler gas/oil burner flame safety monitoring control cabinet core signal conditioning unit.
• Petrochemical Industry: Refinery process heating furnace, cracking furnace industrial burner flame detection and safety interlock matching application.
• Food Processing Industry: Food drying tunnel gas combustion furnace, baking equipment burner flame safeguard control system configuration.
• Textile Printing & Dyeing Industry: Thermal setting machine hot blast burner, waste heat recovery furnace flame signal collection and conversion.
• Building Materials Manufacturing Industry: Ceramic kiln, asphalt production heating furnace industrial burner safety flame monitoring installation.
• Waste Incineration Environmental Protection Industry: Municipal solid waste incinerator auxiliary combustion burner flame detection and safety interlock control.

11. Model Series Classification

• Base standard model: 05701-A-0301 (Factory default AC120V input standard version without accessory wiring harness)
• Derivative variant 1: 05701-A-0302 (AC230V rated input customized model for European, Asian industrial power grid specification)
• Derivative variant 2: 05701-A-0301-C (PCB full conformal coated anti-corrosion version for high-humidity coastal and chemical corrosive atmosphere working site)
• Derivative variant 3: 05701-A-0301-K (Complete kit with factory pre-terminated three groups of matched wiring cables for direct field wiring installation)

12. Installation Requirements

1. Cabinet installation environment standard: Install inside IP42 or above closed combustion control cabinet; keep installation position over 100mm spacing away from high-power contactor and transformer strong magnetic field components.
2. DIN rail installation specification: Fix standard DIN35 aluminum rail horizontally inside cabinet with fixed mounting interval ≤180mm; fasten module bottom buckle onto DIN rail until audible locking click feedback appears.
3. Field wiring construction rule: All UV flame probe signal wiring adopts double-core shielded twisted cable; cable shielding layer single-end grounding at cabinet PE protection ground bar, field probe terminal shielding end suspended without grounding.
4. Power supply wiring specification: AC120V power fetched from cabinet isolated control power supply, power ground wire connected to cabinet PE bar with copper wire cross-section ≥1.0mm².
5. Pre-power-on inspection requirement: After all wiring completion, use multimeter to confirm no short-circuit between each terminal and module shell ground before switching on cabinet control power supply.
6. Sensitivity pre-set regulation: Complete burner cold-state no-fire power-on test first after installation, rotate front potentiometer to finish sensitivity calibration under actual normal combustion flame condition.
7. Post-install preheating standard: Keep module continuous powered preheating for 20 minutes before formal burner ignition commissioning to stabilize internal amplification circuit working state.

13. Usage Precautions

1. Electrostatic protection specification: Wear certified anti-static wristband connected to cabinet PE ground bar when opening shell or adjusting internal components; bare-hand direct contact with PCB circuit board and component pins is strictly prohibited.
2. Live operation restriction: Cut off module input AC power completely before any terminal wiring modification; live plugging/unplugging of flame probe signal wire is forbidden during burner normal running state.
3. Daily maintenance management: Clean module outer surface accumulated dust every six months with dry compressed air at maximum 0.3MPa air pressure; avoid high-pressure air direct impact onto internal PCB solder joint area.
4. Overload constraint: Strictly control external relay output load not exceeding rated 5A@250VAC parameter; prohibit access of overloaded inductive load without intermediate contactor conversion.
5. Spare part storage rule: Store unused spare module inside original factory anti-static packaging bag under 15℃~25℃ dry constant-temperature warehouse, away from corrosive chemical gas and high dust accumulation space.
6. Fault disposal criterion: Cut off corresponding control power supply immediately once continuous abnormal indicator flicker or shell overheating occurs during operation; unauthorized disassembly of outer shell and internal circuit modification are prohibited, contact Honeywell official after-sales technical personnel for maintenance service.
7. Long-term idle equipment management: If control cabinet stops continuous operation over 60 days, cut off module input AC power; place desiccant inside closed cabinet to prevent internal PCB damp condensation corrosion.