Features:
- Full Channel-to-Channel & System Isolation
- Integrated HART Communication on 4 Input Channels
- Dual-Redundant Configuration Support
The Yokogawa AAI835-H03 provides 500V AC isolation between each input/output channel and between channels and the system ground. This eliminates ground loop errors, rejects common-mode noise from VFDs and motors, and protects the control system from field wiring faults. This isolation is essential for applications with long cable runs (up to 600 meters) or mixed grounding potentials across field instruments .
The Yokogawa AAI835-H03 with -H suffix supports HART (Highway Addressable Remote Transducer) protocol on all 4 input channels without additional hardware. This allows the DCS to read secondary variables (PV, SV, TV, FV) from smart transmitters, access device diagnostic information, and perform remote configuration of field instruments directly through the same 4-20 mA wiring. HART data is accessible when using EB401 firmware revision 2 or higher .
The Yokogawa AAI835-H03 can be paired with an adjacent identical module to create a dual-redundant I/O configuration. If the primary module fails, the secondary module automatically takes over without process interruption or control loop bump. This feature is critical for safety-instrumented functions (SIFs), emergency shutdown systems (ESD), and other high-availability applications in refining and power generation where downtime carries significant financial or safety consequences .
The AAI835-H03 Yokogawa isolated Analog Input/Output Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Yokogawa AAI835-H03 isolated Analog Input/Output Module Manuals,Datasheets,Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Yokogawa AAI835-H03 isolated Analog Input/Output Module
General
- Manufacturer Yokogawa
- Model AAI835-H03
- Condition New Original ready stock
- Product Family AAI835-H00,AAI135-H53,AAI835-H50
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- System Compatibility: Fully compatible with CENTUM VP (R3.02 and later) and CENTUM CS 3000 (R3.05 and later). HART function requires EB401 firmware revision 2 or higher on the communication module .
- Firmware Update Method: No user field firmware update required. Module revision is identified by STYLE code (e.g., S1, S3). Different STYLE versions are functionally compatible, but mixing very different STYLE codes on the same RIO bus is not recommended by Yokogawa .
- HART Enablement: For Yokogawa AAI835-H03, HART communication is enabled by the -H suffix in the model number. This is a hardware-designated feature and cannot be enabled via software on -S (standard) suffix modules. Confirm suffix code before ordering if HART functionality is required .
- Diagnostic Access: The Yokogawa AAI835-H03 reports module status (power, communication, channel health) to the CENTUM VP system for display on the operator workstation. Modules equipped with HART also report field device status (e.g., "Maintenance Required," "Out of Specification") and provide user-configurable alarms.
- Temperature Range: 0 to 60°C (32 to 140°F) for standard modules; -20 to 70°C (-4 to 158°F) for modules with -3 suffix option, suitable for outdoor enclosures or unheated shelters .
- Humidity: 10 to 90% RH, non-condensing – Standard indoor control room environment.
- Altitude: Up to 2,000 meters (6,560 feet) without performance derating; higher altitudes require consideration of reduced cooling air density.
- Atmosphere: Pollution Degree 2 (non-conductive pollution only) – Suitable for clean industrial control rooms and IP54 protection-rated field enclosures. For sandy/dusty environments, additional enclosure protection required.
- Oil & Gas Production & Refining: Monitoring wellhead pressure and flow (4-20 mA inputs) while controlling chemical injection pumps and ESD valves (4-20 mA outputs). The Class I, Div 2 / ATEX Zone 2 certification allows installation in classified areas around separators, compressors, and storage tanks .
- Chemical & Petrochemical Processing: Connecting to pH, conductivity, and gas analyzers for reaction monitoring, with outputs driving modulating control valves for reagent dosing. Channel isolation prevents cross-contamination of signals from aggressive chemical environments.
- Power Generation: Reading steam pressure, feedwater flow, and bearing temperature transmitters; outputs controlling turbine governor valves and boiler combustion dampers. Dual-redundant configuration supports high-availability requirements for critical turbine control loops .
- Pharmaceutical & Biotech Manufacturing: Monitoring fermentation vessel parameters (temperature, pH, dissolved oxygen) and controlling sterile media addition and cooling jacket valves. HART capability enables digital access to smart transmitter diagnostics for batch record compliance.