{"product_id":"honeywell-51309355-001-processor-board","title":"Honeywell 51309355-001 Processor Board","description":"\u003cp\u003eThe \u003cstrong\u003eHoneywell 51309355-001\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e51309355-001\u003c\/strong\u003e Processor Board, operates as a dedicated hardware component for executing real-time algorithm calculations and control processing within Honeywell DR4500 Classic Circular Chart Recorder systems.\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\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e51309355-001\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.22 lbs (0.10 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard DR4500 chassis mounting footprint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eDerived from primary recorder power supply module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory Configuration\u003c\/td\u003e\n\u003ctd\u003eOnboard socketed EPROM and static RAM (SRAM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClock\/Retention\u003c\/td\u003e\n\u003ctd\u003eOnboard lithium coin-cell battery holder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBoard Revision\u003c\/td\u003e\n\u003ctd\u003eLevel B\/G\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control \u0026amp; Loop Performance Integration\u003c\/h3\u003e\n\u003cp\u003eThe 51309355-001 microprocessing engine serves as the main computational board inside the circular chart recorder, directly orchestrating the acquisition, digitization, and charting of field process variables.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-20 mA HART Loop Integration:\u003c\/strong\u003e The processor board coordinates the incoming digitized signals from 4-20 mA transmitter loops, RTD, and thermocouple inputs, executing local mathematical scaling and routing the formatted values to the display and servo pen-drive assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA\/D Conversion and Multi-Channel Isolation:\u003c\/strong\u003e It supports multi-channel processing with high common-mode noise rejection, ensuring that industrial electromagnetic interference does not compromise loop calculation accuracy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCold Junction Compensation (CJC):\u003c\/strong\u003e The board interfaces directly with local input terminal assemblies containing temperature-sensitive reference resistors to perform real-time cold junction compensation for all standard thermocouple curves (Type J, K, T, E, R, S, B).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e Does the 51309355-001 processor board support hot-swapping while the DR4500 recorder is active?\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA:\u003c\/strong\u003e No. All power to the DR4500 circular chart recorder must be completely isolated before extracting or inserting the processor board. Attempting to replace the board under load will cause severe voltage transients that can permanently corrupt the socketed firmware EPROMs or destroy downstream driver circuitry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What is the purpose of the onboard lithium coin-cell battery?\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA:\u003c\/strong\u003e The onboard battery preserves system configuration variables, calibration factors, and time-stamped history logs within the volatile SRAM during periods of primary instrument power loss.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e How are firmware upgrades or program modifications managed on this board?\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA:\u003c\/strong\u003e The firmware is programmed onto physical, socketed Dual In-line Package (DIP) EPROM chips. Modifying the system operating program requires replacing these physical chips with verified, updated hardware versions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrostatic Protection Mandate:\u003c\/strong\u003e This board houses highly sensitive complementary metal-oxide-semiconductor (CMOS) microchips. Technicians must wear a grounded ESD wrist strap and handle the PCB only by its non-conductive fiberglass borders to prevent static damage during installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Ground and Shield Termination:\u003c\/strong\u003e Ensure the recorder enclosure has a low-impedance connection to a dedicated protective earth (PE) ground. Signal cable shields from 4-20 mA transmitters or thermocouples must be grounded according to the system layout instructions to prevent ground loop currents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRibbon Cable Connection Integrity:\u003c\/strong\u003e Carefully align and firmly press home the multi-pin ribbon cables extending from the power supply, display, and pen drive assemblies to the corresponding headers on the 51309355-001 board. Ensure the locking tabs are fully clicked to prevent contact resistance caused by industrial physical vibrations.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":48167326875838,"sku":"51309355-001","price":560.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-07-16_10-04-05_9b9f34c1-0d60-4b22-b1b7-e1fcab88700c.png?v=1784177553","url":"https:\/\/www.autooiltech.com\/products\/honeywell-51309355-001-processor-board","provider":"AutoOilTech Limited","version":"1.0","type":"link"}