Product Overview

The Honeywell 05701-A-0328 functions as a core analytics and relay interface module within the System 57 rack-mounted control architecture. This single-channel control card processes analog (4-20mA/0-10V) or digital signals from field sensors to drive critical safety actions. It features triple SPCO (Single-Pole Changeover) relays that actuate alarms, beacons, or emergency shutdown (ESD) valves based on user-defined setpoints. Engineered specifically for fire and gas detection, the 05701-A-0328 bridge the gap between field monitoring and automated safety response, ensuring high-integrity protection in explosive and toxic environments.

Technical Specifications

Engineering Advantages

• High-Integrity Switching: The triple SPCO relay configuration allows for independent voting logic or tiered alarm levels (A1, A2, and Fault). This prevents unnecessary shutdowns while ensuring that the system executes safety protocols instantly upon reaching verified hazard thresholds.

• Harsh Environment Resilience: Unlike commercial-grade controllers, the 05701-A-0328 operates across an extended temperature range from -40 Celsius to +85 Celsius. This makes it ideal for remote wellheads and unconditioned turbine enclosures where extreme thermal cycling occurs.

• Diagnostic Precision: The card monitors the health of the connected field sensor and its own internal circuitry. It utilizes a dedicated fault relay to notify operators of loop failures or power loss, distinguishing between a critical gas leak and a simple maintenance requirement.

• Rapid Maintenance Design: The card format allows for hot-swapping within the Honeywell 5701 rack system (depending on system configuration). This modular approach minimizes downtime during upgrades or channel expansions, as technicians can replace individual cards without disturbing the wiring of adjacent channels.

FAQs

• Can I configure the relays to be normally energized?

  Yes. You can individually configure each relay on the 05701-A-0328 to be "normally energized" (fail-safe) or "normally de-energized" depending on your site’s safety logic requirements.

• Does this card support both 2-wire and 3-wire gas detectors?

  The 05701-A-0328 accepts standard 4-20 mA signals. While the card processes the signal, you must ensure the System 57 rack power supply and backplane wiring match the specific power requirements of your 2-wire or 3-wire field transmitter.

• What is the condition of this unit?

  We supply the 05701-A-0328 as 100% Brand New and Original Honeywell equipment. We ship every unit in its original factory packing to ensure anti-static protection and full traceability.

• Is this card compatible with legacy System 57 racks?

  This card maintains backwards compatibility with standard 5701 series racks. However, we recommend verifying your existing firmware and backplane configuration if you are integrating it into a system older than 10 years.