Yokogawa AAI135-S03 Analog Input Module

The Yokogawa AAI135-S03 is an 8-channel analog input module designed to receive 4-20 mA signals from field transmitters. It features electrically isolated input channels, allowing the control system to acquire multiple current signals while maintaining channel-to-channel isolation. Furthermore, its 10 ms data update period supports regular process signal acquisition, while the S03 configuration includes the ISA Standard G3 option and an extended operating temperature option.

Input Signal and Channel Configuration

The AAI135-S03 provides eight analog input channels, each accepting a 4-20 mA current signal. Channel isolation helps prevent electrical interference between input circuits. The module also supports an allowable input current of 25 mA, providing a defined operating limit for connected signal sources.

The input resistance varies with the input current when the module is powered on. When power is off, the input resistance is 500 kOhm or higher. Therefore, these resistance characteristics should be considered when checking transmitter loop conditions.

Isolation and Measurement Performance

The module provides 500 VAC withstand voltage for one minute between the input and system, as well as between individual input channels. This electrical isolation separates the input circuits from the system and from one another.

In addition, the module has an accuracy of +/-16 uA and a temperature drift of +/-16 uA/deg C. Its 10 ms data update period defines how frequently the module updates acquired input data for the control system.

Transmitter Power Supply

The AAI135-S03 provides transmitter power with an output voltage of at least 15.0 V at 20 mA. At 0 mA, the specified voltage is 29.3 V or less. These values are relevant when checking the available loop voltage for connected 4-20 mA transmitters.

Technical Specifications

Model Configuration

The AAI135-S03 suffix identifies a specific hardware and environmental configuration. Based on the supplied ordering information:

• AAI135: 8-channel analog input module for 4-20 mA signals.
• S: Standard type.
• 0: Basic type.
• 3: ISA Standard G3 option and -20 to 70 deg C temperature option.

The HART communication option and explosion protection suffixes are separate configuration choices. They should not be assumed to be included in the AAI135-S03.

Frequently Asked Questions

Q: How many input channels does the AAI135-S03 provide?

A: It provides eight isolated analog input channels. Each channel accepts a 4-20 mA current signal.

Q: Does the AAI135-S03 support HART communication?

A: The supplied ordering information identifies HART as a separate suffix option (-H). The AAI135-S03 designation does not indicate that this option is included.

Q: What is the operating temperature range of the AAI135-S03?

A: The S03 configuration includes the temperature option specified for -20 to 70 deg C, together with the ISA Standard G3 option.