{"product_id":"2mlf-rd4a-honeywell-resistance-temperature-detector-input-modules","title":"2MLF-RD4A | Honeywell | Resistance Temperature Detector Input Modules","description":"\u003ch2\u003eHoneywell 2MLF‑RD4A Resistance Temperature Detector Input Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for RTD‑based temperature acquisition in HC900\/ControlEdge measurement networks, the \u003cstrong\u003eHoneywell 2MLF‑RD4A\u003c\/strong\u003e (\u003cstrong\u003e2MLF‑RD4A\u003c\/strong\u003e RTD input module) provides direct 3‑wire sensing, multi‑channel conversion, and stable backplane interfacing for resistance‑based temperature inputs.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003e2MLF‑RD4A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOrigin\u003c\/th\u003e\n\u003ctd\u003eHC900 \/ ControlEdge I\/O Platform\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e0.15 kg (shipping weight 2 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temp\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Consumption\u003c\/th\u003e\n\u003ctd\u003e5 V, 450 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eResistance Temperature Detector Input Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChannels\u003c\/th\u003e\n\u003ctd\u003e4‑channel current input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAccuracy\u003c\/th\u003e\n\u003ctd\u003e±0.2% @ 25 deg C; ±0.3% @ 0–55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Conversion Speed\u003c\/th\u003e\n\u003ctd\u003e40 ms per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWiring Method\u003c\/th\u003e\n\u003ctd\u003e3‑wire RTD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTerminal Block\u003c\/th\u003e\n\u003ctd\u003e18‑point terminal block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003e4‑20 mA HART Loop Protocol and Channel Isolation Behavior\u003c\/h3\u003e\n\u003cp\u003eAlthough the 2MLF‑RD4A is a resistance‑based temperature module rather than a loop‑powered analog input, its operation aligns with Honeywell’s process‑instrumentation conventions. When installed alongside HC900 analog modules, the backplane maintains deterministic timing for \u003cstrong\u003e4‑20 mA HART loop protocol\u003c\/strong\u003e devices. The RTD module’s architecture preserves \u003cstrong\u003echannel‑to‑channel isolation\u003c\/strong\u003e, preventing resistance‑measurement cross‑talk and ensuring stable conversion cycles across all four channels.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the 2MLF‑RD4A be hot‑swapped during operation?\u003c\/strong\u003e A: No. The module must be inserted or removed only when the controller rack is de‑energized.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the 40 ms\/channel conversion speed affect scan timing?\u003c\/strong\u003e A: Conversion speed determines how quickly each RTD channel updates. Overall scan timing depends on the controller’s configured I\/O strategy.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Are 2‑wire RTDs supported?\u003c\/strong\u003e A: The module is designed for 3‑wire RTD wiring. Using 2‑wire devices may introduce uncompensated lead resistance.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMaintain consistent 3‑wire RTD routing to avoid imbalance between lead resistances.\u003c\/li\u003e\n\u003cli\u003eKeep sensor wiring isolated from high‑voltage conductors to reduce induced noise.\u003c\/li\u003e\n\u003cli\u003eBond shielded cable grounds at a single termination point to prevent circulating currents.\u003c\/li\u003e\n\u003cli\u003eEnsure proper seating of the 18‑point terminal block before energizing the rack.\u003c\/li\u003e\n\u003cli\u003eAvoid mixing long‑run RTD wiring with fast‑switching digital outputs to minimize electromagnetic coupling.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":48206930903230,"sku":"2MLF-RD4A","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-07-02_10-52-26.png?v=1782960817","url":"https:\/\/www.autooiltech.com\/products\/2mlf-rd4a-honeywell-resistance-temperature-detector-input-modules","provider":"AutoOilTech Limited","version":"1.0","type":"link"}