Description

The Honeywell Analytics 301-EM-RFSA-US3 is a multi-zone gas detection controller and remote fan shut-off accessory engineered for industrial and commercial safety monitoring applications. Designed for integration with toxic gas, refrigerant, and combustion gas sensors, this controller provides advanced alarm handling, ventilation control, and Modbus communication for centralized gas monitoring systems. The Honeywell 301-EM-RFSA-US3 combines relay outputs, 4-20mA signal transmission, and programmable alarm functionality to support reliable environmental safety management in demanding facilities.

Technical Specifications

Information About 301-EM-RFSA-US3

The 301-EM-RFSA-US3 is a Honeywell Analytics gas detection expansion module designed for use in refrigeration plants, laboratories, parking garages, transportation facilities, pharmaceutical environments, and cold storage applications. It supports monitoring of multiple gases including CO, NO2, and various refrigerants through electrochemical and infrared sensing technologies integrated with compatible remote transmitters and sensors. The controller features RS-485 Modbus networking, four programmable DPDT relays, audible and visual alarm indication, and multiple 24VDC outputs for activation of strobes and horns during hazardous gas events. Built for U.S. regulatory environments, this module offers simplified wiring, flexible multi-zone supervision, and dependable long-term performance in industrial gas safety systems.

Key Features:

• Multi-Zone Gas Monitoring: Supports supervision of up to twenty gas detection zones.
• Remote Fan Shut-Off Function: Automatically activates ventilation and fan control systems during alarm conditions.
• Wide Gas Compatibility: Detects CO, NO2, and multiple refrigerant gases including R11, R12, R22, R123, R125, and R134A.
• RS-485 Modbus Communication: Enables network integration with building automation and safety systems.
• 4-20mA Signal Outputs: Provides analog output for each connected sensor.
• Four DPDT Relay Outputs: Includes programmable relays rated at 5A for alarm and control applications.
• Integrated Audible Alarm: Features 65 dBA internal horn for local alarm notification.
• Backlit LCD Display: Allows clear system monitoring and status indication.
• Visual Alarm Indicators: Multi-color LED indication for normal, fault, and alarm conditions.
• Strobe and Horn Outputs: Includes three dedicated 24VDC outputs for external warning devices.
• Flexible Power Input: Operates from either AC or DC industrial control power sources.
• NEMA 1 Enclosure: Suitable for indoor industrial and commercial installations.

The 301-EM-RFSA-US3 delivers the reliability and precision required for industrial gas detection, refrigeration safety monitoring, and automated ventilation control systems.