{"product_id":"yokogawa-nfai143-h50-a4as0-isolated-analog-input-module","title":"Yokogawa NFAI143-H50\/A4AS0 Isolated Analog Input Module","description":"\u003cp\u003eThe Yokogawa NFAI143-H50\/A4AS0 is specified in the supplied information as a 16-channel analog input module for Yokogawa CENTUM VP and CENTUM CS 3000 distributed control systems. It accepts 4-20 mA DC signals from field transmitters and converts them into process data for control and monitoring. The stated configuration includes HART communication support, field-signal isolation, and transmitter power supply capability.\u003c\/p\u003e\n\u003ch3\u003eInput Channels and Signal Processing\u003c\/h3\u003e\n\u003cp\u003eThe module provides 16 isolated input channels for 4-20 mA DC signals, with an allowable input current of up to 24 mA. Each channel can be configured for a 2-wire or 4-wire transmitter. This allows the module to accommodate different transmitter power arrangements within the supported system configuration.\u003c\/p\u003e\n\u003cp\u003eThe specified accuracy is +\/-0.1% of full scale, with a 10 ms data refresh cycle and a 100 ms input step response time. These parameters describe the module's measurement accuracy, process-data update interval, and response to a change in the input signal, respectively.\u003c\/p\u003e\n\u003ch3\u003eHART Communication and Transmitter Power\u003c\/h3\u003e\n\u003cp\u003eThe HART version supports digital communication with compatible smart field instruments over the analog current loop. HART communication can provide access to supported instrument parameters and diagnostic information in addition to the primary process measurement. The exact supported HART functions depend on the applicable module and system configuration.\u003c\/p\u003e\n\u003cp\u003eThe stated transmitter supply is 24.0 to 25.5 V DC, with a current limit of 25 mA. When using 2-wire transmitters, verify that the transmitter's supply and current requirements are within this limit. Four-wire transmitters use a separate power arrangement, which must be considered when planning field wiring.\u003c\/p\u003e\n\u003ch3\u003eElectrical Isolation and Power Requirements\u003c\/h3\u003e\n\u003cp\u003eThe NFAI143 provides isolation between the input circuits and the system, with a specified withstand voltage of 1500 V AC for one minute. Integrated overcurrent protection is also specified. These features help limit the effects of electrical faults and potential differences between field wiring and the system side; they do not replace appropriate grounding and wiring practices.\u003c\/p\u003e\n\u003cp\u003eThe published maximum current consumption is 230 mA at 5 V DC and 540 mA at 24 V DC. The 24 V DC supply requirement for the analog field power circuit should be checked separately from the module's system-bus power consumption.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cfigure\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\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eNFAI143-H50\/A4AS0\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\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eIsolated Analog Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Input Channels\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Signal\u003c\/td\u003e\n\u003ctd\u003e4-20 mA DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAllowable Input Current\u003c\/td\u003e\n\u003ctd\u003e24 mA DC maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Resistance\u003c\/td\u003e\n\u003ctd\u003e250 ohm when powered on; 500 kOhm or more when powered off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput 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\u003eInput Step Response Time\u003c\/td\u003e\n\u003ctd\u003e100 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Drift\u003c\/td\u003e\n\u003ctd\u003e+\/-0.01%\/deg C maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHART Communication\u003c\/td\u003e\n\u003ctd\u003eSupported by HART version\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitter Power Supply\u003c\/td\u003e\n\u003ctd\u003e24.0 to 25.5 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitter Supply Current Limit\u003c\/td\u003e\n\u003ctd\u003e25 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitter Configuration\u003c\/td\u003e\n\u003ctd\u003e2-wire or 4-wire, selectable per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Withstand Voltage\u003c\/td\u003e\n\u003ctd\u003e1500 V AC for 1 minute, input to system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOvercurrent Protection\u003c\/td\u003e\n\u003ctd\u003eProvided\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Current Consumption\u003c\/td\u003e\n\u003ctd\u003e230 mA at 5 V DC; 540 mA at 24 V DC\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\u003eExternal Connection\u003c\/td\u003e\n\u003ctd\u003ePressure-clamp terminal or MIL connector cable, subject to the applicable terminal assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003eThe electrical specifications above are based on Yokogawa's published NFAI143 module documentation. The exact \/A4AS0 terminal and option configuration should be confirmed against the applicable ordering specification before replacement or procurement.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How many field transmitters can the NFAI143-H50\/A4AS0 support?\u003c\/p\u003e\n\u003cp\u003eA: The module provides 16 analog input channels. Each channel accepts a 4-20 mA DC signal, and the transmitter arrangement can be configured for 2-wire or 4-wire operation.\u003c\/p\u003e\n\u003cp\u003eQ: Does this module support HART instruments?\u003c\/p\u003e\n\u003cp\u003eA: The HART version supports digital communication with compatible HART field instruments. Confirm the required HART functions and system-side asset-management support before integrating it into an existing installation.\u003c\/p\u003e\n\u003cp\u003eQ: What should be checked before replacing an installed module?\u003c\/p\u003e\n\u003cp\u003eA: Verify the complete model number, including -H50\/A4AS0, the terminal assembly and cable arrangement, the field power supply, and the controller platform. Do not assume that matching the NFAI143 base model alone establishes compatibility with the existing installation.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":67902997004530,"sku":null,"price":235.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0730\/5589\/5794\/files\/NFAI143-H50A4AS02.jpg?v=1793091750","url":"https:\/\/www.petrospare.com\/products\/yokogawa-nfai143-h50-a4as0-isolated-analog-input-module","provider":"Petro Spare Industrial Limited","version":"1.0","type":"link"}