05704-A-0146 Honeywell 5704F Four-Channel Fire & Gas Control Card

Product Description

05704-A-0146, also known as 5704F card, is a microprocessor-based four-channel plug-in control card manufactured by Honeywell Analytics for the legacy System 57 fire and gas detection rack. This rack-mounted board supplies excitation power for field catalytic bead combustible gas sensors, processes incoming sensor signals, compares measured values against pre-configured alarm and fault thresholds, and communicates status data to the main system backplane. It features built-in multi-point self-diagnosis and front-panel LED indicators for each channel status.

Product Features & Functions

• 4 independent input channels for catalytic bead LEL combustible gas detectors
• Provides adjustable excitation current and bridge balance for field gas sensors
• Signal conditioning and conversion for micro-volt level sensor bridge signals
• Multi-level alarm threshold judgment for pre-alarm and high gas concentration alarm
• Continuous self-diagnosis for cable open circuit, short circuit and sensor failure
• Front panel LED status indicators for alarm, fault and normal channel conditions
• Plug-in rack design, directly inserted into Honeywell System 57 rack backplane
• Transmits channel alarm and fault data to relay interface cards for safety interlock output

Application Scenarios

• Honeywell System 57 fire and gas safety monitoring control rack
• Combustible gas (LEL) detection for petrochemical, refinery and offshore platforms
• Chemical plant, power station gas hazard monitoring and safety interlock system
• Legacy System 57 fire & gas cabinet maintenance and spare parts replacement
• Oil & gas processing plant combustible gas leak monitoring projects

FAQ

Q: What system does 05704-A-0146 belong to?
A: It is the 5704F four-channel control card exclusively designed for Honeywell Analytics System 57 fire and gas detection system.

Q: What type of sensors can this card connect to?
A: It is mainly used for catalytic bead combustible gas sensors to monitor LEL combustible gas concentration.

Q: Is this Honeywell card still in production?
A: Honeywell has discontinued the System 57 series. Only new old stock, used and refurbished boards are available on the spare parts market.