AAI835-H03 YOKOGAWA

AAI835-H03 Yokogawa Input module

Brand：Yokogawa Model number：AAI835-H03

Country of origin: Japan Product weight：0.55kg

HS code：8538900000

Product Details：

Product Dimensions：

The AAI835-H03 module serves as an isolated field interface card that connects field transmitters and control devices directly to the control station backplane. It features 8 input channels and 8 output channels, allowing plant operators to collect precise process variables and send control outputs using a single high-density unit. The "-H03" designation signifies the inclusion of HART communication capability alongside standard 4 to 20 mA signals, as well as specific conformal coating for enhanced environmental protection against corrosive atmospheres. It supports dual-redundant configurations, allowing two modules to be installed side-by-side to ensure continuous operational uptime without single points of failure.

Product Parameters

Module Type: Analog Input / Output Module with HART Communication
Number of Channels: 16 channels total (8 Analog Inputs, 8 Analog Outputs)
Input Signal Range: 4 to 20 mA DC
Output Signal Range: 4 to 20 mA DC
HART Communication: Supported on all input and output channels simultaneously
Allowable Input Load Resistance: 250 ohms typical for current input
Allowable Output Load Resistance: 0 to 750 ohms for current output
Accuracy: Plus or minus 0.1 percent of full scale
Isolation: Channel-to-system field isolation via optical couplers and transformers
Withstand Voltage: 1500 V AC between field signals and system backplane for 1 minute
Power Consumption: Maximum 450 mA at 5 V DC supply from the node unit
Environmental Coating: Class H conformal coating for harsh industrial environments
Operating Temperature: -20°C to 70°C (-4°F to 158°F)
Operating Humidity: 10 to 90 percent non-condensing

Product Advantages

A key advantage of the AAI835-H03 is its combination of input and output channels within a single module slot, significantly increasing I/O density and saving valuable cabinet space in field control stations.

Integrated HART protocol support enables operators to access advanced field device diagnostics, calibration data, and secondary process variables remotely without requiring additional hardware or manual field inspection.

The module supports dual-redundant operation, ensuring uninterrupted field signal transmission and system reliability in critical continuous process operations.

In addition, the conformal coating option protects internal electronic components from moisture, airborne contamination, and corrosive gases, guaranteeing a long operational lifespan in demanding process plant environments.

Important Considerations and Precautions

When wiring field devices to the AAI835-H03 module, correct polarity and proper shielding procedures must be maintained to prevent ground loops and electromagnetic interference from disrupting sensitive analog measurements.

Ensure that the total loop resistance for output channels does not exceed the maximum rating of 750 ohms to prevent output signal clipping or power overload.

Before inserting or removing the module from the field control station baseplate, verify whether the system is configured for hot-swapping to avoid unexpected trips or loss of signal control.

Static electricity precautions, such as using grounded wrist straps, must be observed when handling the module to protect internal semiconductor components from electrostatic discharge.

Proper cooling airflow inside the control cabinet must be maintained to keep ambient operating temperatures within the specified limit.

Product Applications

The AAI835-H03 module is widely deployed across continuous and batch processing industries where precise measurement and field device management are required.

Oil and Gas Refining: Monitoring pressure, temperature, and flow transmitters while driving control valves in distillation units and hydrocrackers.
Chemical and Petrochemical Processing: Interfacing with Smart HART field instruments to manage reactor temperatures, tank levels, and dosing pumps.
Power Generation Plants: Transmitting real-time process parameters from steam turbines, boilers, and cooling systems back to the central control room.
Water and Wastewater Treatment: Managing flow meters, chemical dosing systems, and analytical sensors scattered across large treatment facilities.
Pharmaceutical Manufacturing: Controlling critical process parameters where high precision, signal isolation, and comprehensive instrument diagnostic logging are mandatory.

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