Honeywell Analytics 301-EM-RFSA-US3 Multi-Zone Gas Detection Controller with Modbus Communication

Honeywell · PLCs & Industrial Controllers

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 Condition New/Never Used Surplus Brand Honeywell Analytics Category Gas Detection Part Number 301-EM-RFSA-US3 Subcategory Gas Detection Controllers Product Type Remote Fan Shut-Off Expansion Module Communication RS-485, Modbus Signal Output 4-20mA Output Load 1000Ω @ 24 VDC per sensor Relay Outputs 4 DPDT Relays Relay Rating 5A, 30 VDC / 250 VAC Supply Voltage 22-27 VAC, 50/60 Hz or 22-38 VDC Power Consumption 48 VA AC / 2A Max DC Display Type Backlit LCD Alarm Indicators Green, Red, Yellow, Amber LEDs Audible Alarm 65 dBA @ 3 ft Measurement Range CO 0-250 ppm Measurement Range NO2 0-10 ppm Measurement Range Refrigerants 0-1000 ppm Sensing Technology Electrochemical / Dual Infrared Calibration Interval 6 Months Response Time 60 Seconds Maximum Sensor Distance Up to 500 ft (160 m) Operating Temperature 32°F to 100°F (0°C to 40°C) Operating Humidity 0% to 95% RH Non-Condensing Enclosure Rating NEMA 1 Approvals CSA Application Refrigeration, Laboratory, Transportation, Pharma, Medical Dimensions 7.99"H x 11.02"W x 2.76"D Weight 3.1 lb (1.4 kg)     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.

Brand: Honeywell · Category: PLCs & Industrial Controllers

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.

Specifications

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