Honeywell 05701-A-0302 System 57 Single Channel Catalytic Gas Detection Control Card
- Product Code: 05701-A-0302
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Application Attributes：Honeywell 05701-A-0302 System 57 Single Channel Catalytic Gas Detection Control Card
Honeywell 05701-A-0302 System 57 Single Channel Catalytic Gas Detection Control Card
Manufacturer: Honeywell Process Solutions
Model: 05701-A-0302
Series: System 57 Rack Gas Monitoring & Detection System
Type: Single-channel catalytic bead gas detector control rack card
Function: Signal acquisition & processing for catalytic LEL combustible gas sensors; built-in sensor excitation power; real-time gas concentration display; 3-level alarm relay output (A1/A2/Fault); 4-20mA analog retransmission; Modbus RTU communication; integrated fault self-diagnosis for sensor break, short circuit, power failure
1. Overview
05701-A-0302 is the core single-channel rack-mount control card of Honeywell System 57 gas safety monitoring system, specially designed for catalytic bead combustible gas sensors (LEL). It is installed in standard 19-inch 3U rack cabinets, supporting 2-wire/3-wire bridge type gas probes.
The front panel is equipped with a 4-digit LCD digital display + bar graph, real-time showing gas concentration percentage LEL, with independent LED status lights for A1 low alarm, A2 high alarm, fault and inhibit lockout. Three groups of relay dry contacts can interlock exhaust fans, cut-off valves and sound-light alarms. It outputs standard 4–20mA analog signal to DCS/PLC, and adopts Modbus RTU RS485 bus to upload gas data, alarm and fault information to upper monitoring host.
Built-in complete sensor fault diagnosis function, automatically identify sensor open circuit, short circuit, drift failure, and trigger fault alarm. Supports field calibration via front panel buttons, adjustable alarm thresholds in 1%FS steps, low-drift circuit design to ensure long-term stable measurement in petrochemical, power, oil & gas hazardous areas. Fully compatible with Experion PKS DCS system integration.
2. Technical Specifications
• Power Supply: DC24V nominal operating power
• Supported Sensor: Catalytic bead bridge combustible gas probe (2/3 wire)
• Measuring Range: 0–100% LEL full scale
• Measurement Accuracy: ±1%FS full scale error
• Display: 4-digit LCD digital + bar graph trend indicator
• Alarm Relays: A1 low alarm, A2 high alarm, Fault fault relay (3 groups of isolated dry contacts)
• Analog Output: Isolated 4–20mA proportional gas concentration signal
• Communication Interface: RS485 Modbus RTU multi-drop bus
• Alarm Adjustment: Threshold adjustable in 1%FS incremental steps
• Fault Detection: Sensor open/short circuit, power loss, internal hardware failure auto-diagnosis
• Operating Temperature: -5℃ ~ +55℃
• Storage Temperature: -40℃ ~ +85℃
• Humidity: 5%~95% RH non-condensing
• Mounting: Standard 19-inch 3U rack slot insertion
• Dimensions: 170mm(H) × 25mm(W) × 112mm(D)
• Weight: Approx. 0.165kg
• Compliance: EN 50270, RoHS 2.0, Class 1 Div 2 hazardous area certification
3. Key Features
• Dedicated catalytic gas sensor signal processing Built-in stable bridge excitation power without external power supply modules
• Three-stage hierarchical alarm management Independent A1/A2 concentration alarms + equipment fault relay, separate LED indication for quick on-site judgment
• Dual signal output mode Isolated 4–20mA analog + Modbus RTU digital communication, compatible with DCS/SCADA/PLC systems
• Integrated front panel operation & display Real-time concentration bar graph, one-key alarm reset, on-site calibration without extra handheld tools
• Full automatic sensor fault diagnosis Timely report probe damage, short circuit, drift to avoid false/missing alarms
• Low drift industrial circuit design Long-term stable measurement for continuous hazardous gas monitoring
• Rack modular plug-and-play design Easy cabinet expansion, hot-swap maintenance of single channel without shutting down the whole rack
4. Applications
• Refinery & petrochemical plant combustible gas leakage centralized rack monitoring system
• Thermal power plant coal gas, hydrogen, fuel gas safety detection cabinet
• Oil & gas station, compressor station LEL gas concentration alarm control rack
• Chemical warehouse, pharmaceutical factory flammable solvent vapor real-time monitoring system
Honeywell © 05701-A-0302 System57 Single Channel Catalytic Gas Detection Control Card