AAI143-H53

The Yokogawa AAI143-H53 is a 16-channel isolated analog input module designed to acquire 4-20 mA DC signals from field transmitters. It supports HART digital communication and provides channel-level signal acquisition for process control systems. This model includes the ISA Standard G3 option and an extended operating temperature specification of -20 to 70 deg C.

Functional Description

The AAI143-H53 receives analog current signals from 2-wire or 4-wire field transmitters and converts them into digital process data for the control system. Its 16 isolated input channels support the acquisition of multiple process variables, such as pressure, flow, level and temperature measurements transmitted as 4-20 mA signals.

The HART communication function allows digital instrument information to be exchanged alongside the analog measurement signal. This provides access to supported smart-transmitter data in addition to the primary process value.

Input Characteristics and Signal Processing

The module uses a 4-20 mA input range with a data update period of 10 ms. Its specified accuracy is +/-16 uA, allowing the control system to process analog measurements at the module's stated accuracy level.

The allowable input current is 24 mA. The transmitter supply provides at least 19.0 V at 20 mA, with a maximum voltage of 25.5 V at 0 mA and an output current limit of 25 mA. These values should be considered when checking the electrical requirements of connected transmitters.

Isolation and Environmental Protection

The input circuitry provides module-level isolation between the field signal circuits and the control system. The specified withstand voltage is 1500 V AC for 1 minute between the input and system sides. Input resistance varies with the operating current, so the voltage drop across the module should be included when checking the transmitter loop's available voltage.

The H53 configuration combines HART communication with the non-explosion-protection version and the ISA Standard G3 option. The G3 option is intended for environments with corrosive gases, while the specified temperature option extends the module's operating range to -20 to 70 deg C.

Model Configuration

The AAI143-H53 suffix codes identify the main hardware configuration:

• H: Digital communication with HART protocol.
• 5: Version without explosion protection.
• 3: ISA Standard G3 option and -20 to 70 deg C temperature option.

These codes describe the module configuration and should be checked against the installed hardware when selecting a replacement.

Technical Specifications

Parameter	Specification
Model	AAI143-H53
Brand	Yokogawa
Product Type	Analog Input Module
Input Signal	4-20 mA DC
Number of Input Channels	16
Channel Isolation	Isolated between field and system
Allowable Input Current	24 mA
Input Resistance (Power ON)	270 ohm (20 mA) to 350 ohm (4 mA)
Input Resistance (Power OFF)	500 kohm or higher
Accuracy	+/-16 uA
Data Update Period	10 ms
Transmitter Power Supply	19.0 V minimum at 20 mA; 25.5 V maximum at 0 mA
Transmitter Supply Current Limit	25 mA
Withstand Voltage	1500 V AC for 1 minute (input to system)
HART Communication	Supported
Operating Temperature	-20 to 70 deg C
Corrosive Gas Protection	ISA Standard G3

Frequently Asked Questions

Q: Does the AAI143-H53 support HART communication?

A: Yes. The module supports HART digital communication, allowing compatible field devices to provide additional digital variables alongside their 4-20 mA analog signals. HART communication requires compatible field instruments and system configuration.

Q: Can the module connect to both 2-wire and 4-wire transmitters?

A: The AAI143 hardware supports 2-wire and 4-wire transmitter configurations. The transmitter type is selected for each channel using the module setting pin. Check the actual wiring arrangement and transmitter power requirements before commissioning.

Q: Is the AAI143-H53 suitable for explosive atmospheres?

A: No. The suffix code 5 identifies the version without explosion protection. The ISA Standard G3 option provides corrosive-gas environmental protection, not hazardous-area explosion certification.

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