Yokogawa AAI135-H03 analog input module

Yokogawa AAI135-H03 is an 8-channel isolated analog input module designed for industrial process control and automation systems . It belongs to Yokogawa’s CENTUM VP and ProSafe-RS distributed control systems (DCS and SIS) , which are widely used in oil and gas, chemical processing, power generation, water treatment and manufacturing industries .

The module has high accuracy, high reliability and long-term stability , and is an essential component for critical industrial applications that require precise signal acquisition . The AAI135-H03 supports 4-20 mA analog input signals and HART (Highway Addressable Remote Transducer) communication for enhanced monitoring, diagnostics and remote configuration .

Each input channel is electrically isolated to prevent signal interference, minimize electrical noise, and eliminate ground loop issues . This ensures that signals from field instruments such as pressure transmitters, temperature sensors, and flow meters are accurately captured and transmitted to the control system for precise process control.

Designed to operate in harsh industrial environments , the AAI135-H03 features robust electrical protection, a wide operating temperature range, and industry-standard certifications , ensuring it can withstand demanding conditions such as extreme temperatures, humidity, and electrical interference .

The module’s low power consumption, efficient design , and easy installation and maintenance make it an excellent choice for new automation projects and system upgrades .

Technical specifications

Key Features and Benefits

1. High precision and high reliability

16-bit resolution and ±0.1% accuracy ensure that even the smallest changes in analog signals are captured with high precision , enabling better process control and optimized system performance .

2. Electrical isolation improves signal quality

Each of the eight input channels is electrically isolated to prevent interference between signals, reduce noise , and prevent ground loop problems, which is critical in electrically noisy industrial environments .

3. HART communication for advanced diagnostics

With HART protocol support , the AAI135-H03 enables digital two-way communication between field devices and control systems , enabling remote configuration, real-time diagnostics, and predictive maintenance. This reduces the need for manual on-site visits and improves overall system efficiency.

4. Wide operating temperature and rugged structure

Designed for harsh industrial environments, the module can operate reliably in temperatures from -20°C to +70°C and withstand extreme temperatures, vibration and moisture . It is also certified for explosion-proof environments , making it suitable for use in hazardous areas such as refineries and chemical plants .

5. Low power consumption and high efficiency

With a power consumption of only 3W, the module is extremely energy efficient and ideal for large industrial systems that require multiple input modules while keeping operating costs low .

6. Compatible with Yokogawa’s leading control systems

The AAI135-H03 integrates seamlessly with Yokogawa’s CENTUM VP, ProSafe-RS, and STARDOM control systems, ensuring smooth data flow, improving process efficiency, and enhancing system reliability .

7. Built-in diagnostics and LED indicators

The module is equipped with self-diagnostics that continuously monitor its own health and detect faults, loop breaks and signal fluctuations , ensuring early detection of problems to prevent system failures. LED indicators provide a quick visual status check , helping maintenance teams respond quickly.

application

The AAI135-H03 is widely used in various process industries that require high-precision analog input signal acquisition . Some common applications include:

• Oil and Gas – Monitor pressure, temperature and flow rates in pipelines, refineries and offshore platforms .
• Chemical Processing – Controlling chemical reactions through precise measurement of process parameters .
• Power Generation – Acquire signals from turbines, generators, and substation equipment to optimize performance.
• Water and wastewater treatment – ​​monitor pH, turbidity, conductivity and dissolved oxygen levels.
• Pharmaceutical industry – ensure accurate control of temperature, pressure and liquid level during drug production .
• Food and Beverage – Control process variables in brewing, dairy, and food production facilities .

Recommended related models

For extended functionality and compatibility, please consider the following Yokogawa analog input modules that are closely related to the AAI135-H03 :