Honeywell 05701-A-0301 Single-Channel Control Card

Description

Honeywell 05701-A-0301 Single-Channel Control Card

Product Overview

The Honeywell 05701-A-0301 is a 4–20 mA Single Channel Control Card designed for the Honeywell Analytics System 57 series control system. It serves as an integrated control, monitoring, and alarm unit for a single industrial gas detector channel.

The card processes incoming 4–20 mA standard analog signals from connected gas transmitters, displays real-time gas concentration data on its front panel LCD, compares readings against preset alarm thresholds, and activates visual alarms or relay contacts when limits are breached.

Technical Specifications

• Analog bar graph: 25 segments

• Digital readout: 4 characters

• Message display: 4 characters

• Status icons: Power On / Card Select | | Alarm / Status LEDs | • Gas Alarms: A1, A2, A3

• System Status: Fault, Inhibit / Calibrate | | Alarm Setting Resolution | 1% of Full Scale Deflection (FSD) steps | | Electronic Drift | Less than ±2% / 6 months | | Memory / Storage | On-board non-volatile EEPROM (retains configuration setup) | | Dimensions & Weight | 170 mm (D) × 25 mm (W) × 112 mm (H) (~3U Eurocard); approx. 165 g |

Key Advantages

• High-Integrity Modular Architecture: Single-channel operation ensures that an issue with one channel will not affect adjacent channels in the System 57 rack, maximizing system reliability and uptime.
• Comprehensive Visual Interface: Features a detailed 4-part LCD providing simultaneous analog trend bar graphs, precise digital engineering unit readings, and text messages alongside high-visibility LED alarm indicators.
• Non-Volatile Configuration: Internal EEPROM stores all alarm setpoints, span/zero calibration settings, and channel parameters without risk of data loss during power outages.
• Self-Diagnostics & Fault Detection: Continuously monitors its internal circuitry, microprocessor function, line integrity, and connected sensor status to immediately alert operators to system faults.
• Flexible System Integration: Pairs seamlessly with System 57 Field Interface Cards and Relay Cards to trigger site sirens, exhaust ventilation fans, or shutdown interlocks.

Important Installation & Usage Precautions

• Input Compatibility Verification: Model 05701-A-0301 is strictly designed for 4–20 mA analog inputs. (Note: Catalytic bead gas sensors require the 05701-A-0302 variant).
• Shielding & Grounding: Sensor cabling shield/armour must be correctly connected to the system protective earth terminal to avoid false alarms caused by electromagnetic interference (EMI/RFI).
• Engineering Key Requirement: Modifying critical setup parameters (zeroing, span calibration, alarm threshold adjustment, or inhibit override) requires inserting the System 57 Engineering Card and Engineering Key into the rack.
• Hot-Swapping Guidelines: Before removing or inserting a control card into a live System 57 subrack, ensure the channel alarm outputs are set to Inhibit to prevent accidental tripping of plant safety interlocks or fire suppression devices.
• Voltage Operating Range: Maintain incoming DC power strictly between 18 V and 32 V DC to ensure stable microprocessor operation and sensor excitation voltage.

Applications

• Oil & Gas Refineries & Offshore Platforms: Continuous monitoring for hazardous toxic gas leaks (e.g., H2SH_2SH2​S, COCOCO) and combustible hydrocarbons in processing bays.
• Chemical & Petrochemical Plants: Centralized gas safety detection interlocked with plant emergency shutdown (ESD) systems.
• Pharmaceutical & Industrial Manufacturing: Environmental monitoring of toxic gases, volatile organic compounds (VOCs), and oxygen depletion in production cleanrooms.
• Water & Wastewater Treatment Facilities: Gas safety monitoring for toxic gases like chlorine (Cl2Cl_2Cl2​), sulfur dioxide (SO2SO_2SO2​), and methane (CH4CH_4CH4​) in enclosed spaces.

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