Yokogawa.AA1835-H03
Yokogawa.AA1835-H03
Yokogawa AAI835-H03
Yokogawa.AA1835-H03
Yokogawa.AA1835-H03
Yokogawa AAI835-H03
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AAI835-H03

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The Yokogawa AAI835-H03 is an isolated Analog Input/Output Module featuring 4 input channels and 4 output channels for 4-20 mA signals, designed for the CENTUM VP/CS 3000 DCS.
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Technical specifications for AAI835-H03

  • Manufacturer:
    Yokogawa
  • Part Number:
    AAI835-H03
  • Product Family:
    Centum CS-Centum VP
  • Product Type:
    Analog I/O Module
  • Input Resistance (Power ON):
    250-320 Ω (approx. 250 Ω nominal)
  • Input Resistance (Power OFF):
    ≥500 kΩ (loop open)
  • Allowable Input Current:
    25 mA
  • Allowable Load Resistance (Output):
    0 to 750 Ω
  • Circuit-Open Detection:
    Output current < 0.65 mA
  • Accuracy (Input):
    ±16 µA
  • Accuracy (Output):
    ±48 µA
  • Data Update Period:
    10 ms
  • Transmitter Power Supply:
    ≥15.0 V at 20 mA; ≤29.3 V at 0 mA
  • Temperature Drift:
    ±16 µA / 10°C
  • Weight:
    0.34 kg
  • Estimated shipping dimensions:
    3.2x10.7x13cm
  • Tariff Code:
    8538909190
  • Country of origin:
    Japan
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Firmware & Updates Operating Environment Applications

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.
Description
The Yokogawa AAI835-H03 integrates 4 analog input and 4 analog output channels in a single, compact module designed for Yokogawa's FIO (Field Input/Output) architecture. Each channel is fully isolated from other channels and from the system ground, providing excellent immunity to ground loops and electrical noise commonly encountered in industrial environments. This isolation feature is critical for maintaining signal integrity in long-distance field wiring scenarios .

The Yokogawa AAI835-H03 supports standard 4-20 mA current loop signals, the industry-standard communication method for pressure, temperature, flow, and level transmitters. On the output side, it can drive control signals to modulating valves, actuators, and VFDs. The module is compatible with pressure clamp terminals (ATI3S series), MIL connector cables, or KS cables, offering flexible field wiring options to suit different installation requirements .

Safety compliance is a key attribute of the Yokogawa AAI835-H03. It carries Class I, Division 2, Groups A, B, C, D and ATEX Zone 2 hazardous area certifications with Temperature Code T4 (maximum surface temperature ≤135°C). This allows installation in environments where flammable gases or vapors may occasionally be present, including petrochemical skids, paint booths, and oil & gas processing facilities .

The Yokogawa AAI835-H03 can be configured for dual-redundant operation, where two adjacent modules work in parallel to provide continuous operation in case of a single module failure. This feature is essential for critical control loops in refining, power generation, and pharmaceutical manufacturing where process interruption is unacceptable .

Alternative Names
AA1835-H03 AAI835-H53 AA1835-H53 AAI835-H00 AAI135-H53 AAI835-H50
Technical notes
The Yokogawa AAI835-H03 provides 500V AC isolation between channels and between channels and system ground, effectively preventing ground loop interference .The Yokogawa AAI835-H03 requires external loop power (24V DC) for 2-wire transmitters; a transmitter power supply is integrated within the module delivering ≥15.0V at 20mA for each input channel .
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Is the Yokogawa AAI835-H03 certified for use in explosive atmospheres for export projects?
Yes. The Yokogawa AAI835-H03 carries both NEC Class I, Division 2, Groups A,B,C,D (North America) and ATEX II 3 G / EX nC [nl] IIC T4 (Europe/International) certifications with Temperature Code T4 (135°C). This dual certification simplifies global procurement. For continuous explosive atmospheres (Division 1 / Zone 0), external intrinsic safety (IS) barriers are required, as the module itself is not intrinsically safe .
Can the Yokogawa AAI835-H03 be used in a hot-swappable manner without shutting down the DCS?
Yes. The Yokogawa AAI835-H03 supports online insertion and removal (hot-swap) in CENTUM VP systems compatible with FIO architecture. The module can be replaced while the system remains operational, with no need to power down the controller node. However, the associated I/O signals will be temporarily unavailable during module replacement—plan replacements during low-criticality operations or use dual-redundant configuration for continuous availability .
What happens to the analog outputs if the Yokogawa AAI835-H03 loses communication with the controller?
Upon CPU communication failure, the analog outputs of the Yokogawa AAI835-H03 can be configured to either hold last value or go to a predefined failsafe state (0 mA or user-configured value). This configuration is set in the CENTUM VP engineering software. For safety-critical applications, external watchdog circuits or safety PLCs should be used for SIL-rated fail-safe behavior .
Can the Yokogawa AAI835-H03 detect a broken wire or transmitter failure on the 4-20 mA loop?
Yes, on output channels. The Yokogawa AAI835-H03 features circuit-open detection that triggers an alarm when output current drops below 0.65 mA. For input channels, a reading of exactly 0 mA (with power applied) typically indicates a field wiring issue. For HART-capable transmitters (connected to -H version), additional diagnostic data including

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