{"product_id":"yokogawa-aai835-h03-analog-i-o-module","title":"Yokogawa AAI835-H03 Analog I\/O Module","description":"\u003cp\u003eThe Yokogawa AAI835-H03 is an isolated analog input\/output module designed for the CENTUM VP field control system. It provides four 4-20 mA analog input channels and four 4-20 mA analog output channels in one module. The HART communication function supports digital communication with compatible field instruments alongside analog signal transmission, allowing the control system to access both process measurements and instrument data.\u003c\/p\u003e\n\u003ch3\u003eFunctional Description\u003c\/h3\u003e\n\u003cp\u003eThe AAI835-H03 handles bidirectional analog signal conversion between field instruments and the Field Control Station (FCS). Input channels receive 4-20 mA signals from transmitters and convert them into digital process data for control and monitoring. Output channels convert FCS output data into 4-20 mA signals for positioning devices and other analog-controlled equipment.\u003c\/p\u003e\n\u003cp\u003eAll eight channels are isolated. This arrangement separates individual field signal circuits and helps limit interference caused by differences in field-side electrical potentials.\u003c\/p\u003e\n\u003ch3\u003eHART Communication\u003c\/h3\u003e\n\u003cp\u003eThe HART version supports digital communication over compatible 4-20 mA instrument loops. The FCS can access analog process values and available HART variables through the I\/O communication structure. This allows smart transmitter information to be handled alongside conventional analog process signals.\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\u003eAAI835-H03\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\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eAnalog I\/O Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Channels\u003c\/td\u003e\n\u003ctd\u003e4\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\u003eOutput Signal\u003c\/td\u003e\n\u003ctd\u003e4-20 mA DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Isolation\u003c\/td\u003e\n\u003ctd\u003eIsolated between channels and between field and system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAllowable Input Current\u003c\/td\u003e\n\u003ctd\u003e25 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Resistance\u003c\/td\u003e\n\u003ctd\u003e290 to 450 ohm (at 4 to 20 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAllowable Output Load\u003c\/td\u003e\n\u003ctd\u003e0 to 750 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Accuracy\u003c\/td\u003e\n\u003ctd\u003e+\/-16 uA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Accuracy\u003c\/td\u003e\n\u003ctd\u003e+\/-48 uA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Update Period\u003c\/td\u003e\n\u003ctd\u003e10 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitter Power Supply\u003c\/td\u003e\n\u003ctd\u003e15.0 V or higher at 20 mA; 29.3 V or less at 0 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Drift\u003c\/td\u003e\n\u003ctd\u003e+\/-16 uA\/10 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Current Consumption\u003c\/td\u003e\n\u003ctd\u003e360 mA at 5 VDC; 450 mA at 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHART Communication\u003c\/td\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWithstanding Voltage\u003c\/td\u003e\n\u003ctd\u003e500 VAC for 1 minute\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal Connection\u003c\/td\u003e\n\u003ctd\u003ePressure clamp terminal, MIL connector cable, dedicated KS1 cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.30 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Option\u003c\/td\u003e\n\u003ctd\u003e-20 to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrosion Protection\u003c\/td\u003e\n\u003ctd\u003eISA Standard G3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eSignal Processing and Electrical Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe four input channels accept current signals from 2-wire or 4-wire transmitters. Transmitter configuration is selected individually for each channel using the module setting pins. The built-in transmitter supply supports loop-powered instruments, with external wiring voltage drops needing consideration when checking the minimum operating voltage.\u003c\/p\u003e\n\u003cp\u003eThe four output channels supply current signals to field control devices. The specified output load range of 0 to 750 ohm defines the permissible connected load resistance. Circuit-open detection is provided when the output current falls below 0.65 mA.\u003c\/p\u003e\n\u003ch3\u003eInstallation and Connection Considerations\u003c\/h3\u003e\n\u003cp\u003eThe module supports pressure clamp terminals, MIL connector cables and dedicated KS1 cables for external signal connections. The selected connection method determines the appropriate terminal or cable arrangement.\u003c\/p\u003e\n\u003cp\u003eFor intrinsically safe applications, Yokogawa specifies that a Zener barrier must not be connected to this module. An isolation barrier should be used instead. The specified isolation withstand voltage also depends on the external cable configuration.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How many field instruments can the AAI835-H03 connect to?\u003c\/p\u003e\n\u003cp\u003eA: The module provides four analog input channels and four analog output channels. It can therefore handle four input signals and four output signals simultaneously.\u003c\/p\u003e\n\u003cp\u003eQ: Does the AAI835-H03 support HART instruments?\u003c\/p\u003e\n\u003cp\u003eA: Yes. Its HART communication function supports digital communication with compatible field instruments over the analog current loops, allowing access to available instrument data in addition to the 4-20 mA process signals.\u003c\/p\u003e\n\u003cp\u003eQ: What should be checked when replacing an existing AAI835 module?\u003c\/p\u003e\n\u003cp\u003eA: Verify the complete model suffix, HART communication requirement, environmental option, external connection method and terminal arrangement. The replacement must also match the applicable FIO system configuration.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":69295633400050,"sku":"AAI835-H03","price":235.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0730\/5589\/5794\/files\/AAI835-H032.jpg?v=1794452487","url":"https:\/\/www.petrospare.com\/products\/yokogawa-aai835-h03-analog-i-o-module","provider":"Petro Spare Industrial Limited","version":"1.0","type":"link"}