{"product_id":"yokogawa-nfai143-s50-s1-centum-vp-analog-input-module","title":"YOKOGAWA NFAI143-S50 S1 CENTUM VP Analog Input Module","description":"\u003ch2\u003eYOKOGAWA NFAI143-S50 S1 Isolated Analog Input Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for direct analog signal acquisition in CENTUM VP, ProSafe-RS, and STARDOM process control architectures, the \u003cstrong\u003eYOKOGAWA NFAI143-S50 S1\u003c\/strong\u003e (\u003cstrong\u003eNFAI143-S50\u003c\/strong\u003e Isolated Analog Input Module) provides direct physical\/electrical execution. The hardware conditions up to 16 current loop field devices, converting raw inputs into digitally sampled values for real-time automation logic.\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\u003eNFAI143-S50 S1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYOKOGAWA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.3 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e2.5 x 12.7 x 12.7 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e24 VDC external transmitter supply (22.8 to 26.4 VDC operating window)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e16 channels, individually isolated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Signal Range\u003c\/td\u003e\n\u003ctd\u003e4-20 mA DC, 0-20 mA DC (Allowable measurement headroom up to 24 mA DC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eA\/D Resolution\u003c\/td\u003e\n\u003ctd\u003e16-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeasurement Accuracy\u003c\/td\u003e\n\u003ctd\u003e+\/-0.1% of full scale\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Refresh Cycle\u003c\/td\u003e\n\u003ctd\u003e10 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Rating\u003c\/td\u003e\n\u003ctd\u003eGalvanic isolation (channel-to-channel and channel-to-system backplane bus)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eChannel Isolation and Cold Junction Compensation\u003c\/h3\u003e\n\u003cp\u003eThe hardware incorporates dedicated channel-to-channel and channel-to-system galvanic isolation to eliminate ground loops across distributed field wiring networks. Integrated signal processing circuitry manages internal cold junction compensation (CJC) alongside automated linearisation routines for process instrument integration. The onboard transmitter power supply maintains loop voltages between 22.8 VDC and 26.4 VDC with an active current limit threshold capped at 25 mA per channel. Channel circuits feature an internal input impedance of 250 Ohm during energized operation, rising above 500 kOhm upon power disruption to safeguard interconnected loop components.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What is the backplane behavior when input signal levels exceed the standard 20 mA loop threshold?\u003c\/p\u003e\n\u003cp\u003eA: The module maintains continuous internal processing and A\/D conversion up to 24 mA DC without initiating hardware channel fault trips or clipping data structures.\u003c\/p\u003e\n\u003cp\u003eQ: How does the internal channel impedance change during a total module power failure?\u003c\/p\u003e\n\u003cp\u003eA: Active internal current loop resistance rests at approximately 250 Ohm under normal operating conditions. When system power removes from the unit, the input circuit transitions to a high-impedance state equal to or exceeding 500 kOhm.\u003c\/p\u003e\n\u003cp\u003eQ: Does removing field connections affect the backplane refresh timing for remaining channels?\u003c\/p\u003e\n\u003cp\u003eA: Channel scanning occurs via concurrent conversion hardware, maintaining a consistent 10 ms data refresh cycle and 100 ms step response time across active channels regardless of open-circuit conditions on adjacent terminal blocks.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSecure the module onto the designated backplane rack location using the alignment guides, engaging locking mechanisms fully before applying power.\u003c\/li\u003e\n\u003cli\u003eRoute all 4-20 mA analog input signal wiring through shielded twisted-pair cables to prevent electromagnetic coupling in harsh industrial environments.\u003c\/li\u003e\n\u003cli\u003eTerminate shield drain wires at the system ground terminal bar while leaving the field instrument end isolated to minimize ground loop potentials.\u003c\/li\u003e\n\u003cli\u003eEnsure pressure clamp terminal connections remain torqued within manufacturer parameters to prevent micro-interruption of low-level DC currents.\u003c\/li\u003e\n\u003cli\u003eMaintain clear ventilation pathways around the enclosure assembly to keep operating temperatures within the specified -20 to +70 deg C thermal envelope.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43914003087450,"sku":"NFAI143-S50 S1","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/88_be97930f-63af-4ebb-ba05-7f1749fabd93.jpg?v=1787727727","url":"https:\/\/www.spareoil.com\/products\/yokogawa-nfai143-s50-s1-centum-vp-analog-input-module","provider":"SpareOil Automation","version":"1.0","type":"link"}