{"product_id":"va301irfsr404a","title":"Vulcain VA301IRFSR404A Sensor","description":"\u003cp\u003eThe \u003cstrong\u003eVulcain VA301IRFSR404A\u003c\/strong\u003e (also identified by part number \u003cstrong\u003eM-509255\u003c\/strong\u003e or \u003cstrong\u003eS301-IRF-R404A\u003c\/strong\u003e) represents the industry standard for high-precision \u003cstrong\u003eR404A refrigerant gas detection\u003c\/strong\u003e in mechanical rooms and chiller plants. This \u003cstrong\u003einfrared refrigerant sensor\u003c\/strong\u003e utilizes dual-channel sensing technology to mitigate signal drift and cross-sensitivity, providing a stable 0–1,000 ppm measurement range with a 1 ppm resolution. Engineered specifically for seamless integration with the \u003cstrong\u003eHoneywell 301EM controller\u003c\/strong\u003e, this unit ensures your facility maintains strict compliance with \u003cstrong\u003eASHRAE 15\u003c\/strong\u003e and \u003cstrong\u003eB-52 safety codes\u003c\/strong\u003e. The rugged ABS-polycarbonate housing is designed for \"at the source\" monitoring; for optimal performance, technicians should mount this \u003cstrong\u003erefrigerant leak detector\u003c\/strong\u003e low on walls or directly to chiller pads, as R404A is heavier than air. With its \u003cstrong\u003e4-20mA signal output\u003c\/strong\u003e and RS-485 Modbus communication capabilities, it provides real-time data to building management systems, facilitating prompt alarm activation and \u003cstrong\u003emechanical ventilation control\u003c\/strong\u003e during critical leak events.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecise Infrared Sensing:\u003c\/strong\u003e Advanced \u003cstrong\u003eNadir IR technology\u003c\/strong\u003e provides accurate \u003cstrong\u003eR404A detection\u003c\/strong\u003e with a 60-second T90 response time.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSystem Integration:\u003c\/strong\u003e Native \u003cstrong\u003eRS-485 Modbus\u003c\/strong\u003e and \u003cstrong\u003e4-20mA current loop\u003c\/strong\u003e compatibility for effortless pairing with \u003cstrong\u003e301EM controllers\u003c\/strong\u003e and \u003cstrong\u003eBAS networks\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnhanced Stability:\u003c\/strong\u003e Dual-beam infrared source minimizes the need for frequent \u003cstrong\u003egas sensor calibration\u003c\/strong\u003e and prevents false alarms from humidity or temperature fluctuations.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCode Compliance:\u003c\/strong\u003e Essential for meeting \u003cstrong\u003eASHRAE Standard 15\u003c\/strong\u003e and \u003cstrong\u003eInternational Mechanical Code\u003c\/strong\u003e requirements in commercial chiller rooms.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e NEMA-rated enclosure stands up to the vibration and thermal cycles found in heavy-duty \u003cstrong\u003eHVAC mechanical rooms\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\n\u003cp\u003e\u003cstrong\u003eIs the VA301IRFSR404A a direct replacement for the M-509255?\u003c\/strong\u003e\u003cbr\u003e\nYes. This sensor is the direct manufacturer replacement part for the \u003cstrong\u003eVulcain M-509255\u003c\/strong\u003e and is technically identical to the \u003cstrong\u003eS301-IRF-R404A\u003c\/strong\u003e. It is designed to work exclusively with the \u003cstrong\u003e301EM\u003c\/strong\u003e and \u003cstrong\u003e301C series controllers\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhere should this R404A sensor be mounted for maximum effectiveness?\u003c\/strong\u003e\u003cbr\u003e\nSince R404A refrigerant is heavier than atmospheric air, the sensor must be installed 12 to 18 inches above the floor. Avoid placing it in areas of high airflow or \"dead zones\" where refrigerant might not naturally accumulate.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes this unit require a separate power supply?\u003c\/strong\u003e\u003cbr\u003e\nThe \u003cstrong\u003eVA301IRFSR404A\u003c\/strong\u003e typically receives its 12 VDC power directly from the \u003cstrong\u003e301EM controller\u003c\/strong\u003e via the communication bus. Ensure you verify the total power load on your controller if running multiple \u003cstrong\u003eremote gas sensors\u003c\/strong\u003e on a single loop.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong style=\"color: red;\"\u003eThis item is not eligible for free shipping.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDisclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.\u003c\/p\u003e","brand":"Vulcain","offers":[{"title":"Default Title","offer_id":35657668044,"sku":"VA301IRFSR404A","price":1082.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/products\/vulcain-va301irfsr404a-sensor-10_83c0a9ff-2e95-4f48-90d8-cc8e973eba9d.jpg?v=1496450788","url":"https:\/\/www.gsistore.com\/products\/va301irfsr404a","provider":"GSIstore","version":"1.0","type":"link"}