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AAI143-S50 S1

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YOKOGAWA AAI143-S50 S1 is a 16-channel isolated analog input module designed for Yokogawa CENTUM VP and CS 3000 DCS, converting 4-20mA signals from field transmitters with high accuracy.
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Technical specifications for AAI143-S50 S1

  • Manufacturer:
    Yokogawa
  • Part Number:
    AAI143-S50 S1
  • Product Family:
    Centum CS-Centum VP
  • Product Type:
    Analog Input Module
  • Input Signal:
    4 to 20 mA DC
  • Allowable Input Current:
    24 mA max
  • Input Resistance (Power ON):
    270 Ω @ 20 mA to 350 Ω @ 4 mA
  • Input Resistance (Power OFF):
    500 kΩ or higher
  • Accuracy:
    ±16 µA
  • Data Update Period:
    10 ms
  • Temperature Drift:
    ±16 µA / 10 °C
  • Current Consumption:
    230 mA (5 V DC) , 540 mA (24 V DC)
  • Weight:
    0.24 kg
  • Estimated shipping dimensions:
    3.2x10.6x13cm
  • Tariff Code:
    8537101190
  • 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 Applications Monitoring & Control Certifications & Standards

Features:

  • Full Channel-to-System Isolation
  • Integrated Transmitter Power Supply
  • Dual-Redundancy Ready
The YOKOGAWA AAI143-S50 S1 provides 1500 V AC isolation between each input channel and the system backbone. This eliminates ground loop errors, protects against field-side voltage surges, and ensures that a fault on one channel does not affect adjacent channels or the controller.

Each channel of the YOKOGAWA AAI143-S50 S1 can power 2-wire loop-powered transmitters directly, delivering 19.0 V minimum at 20 mA. This reduces external power supply requirements, simplifies wiring panels, and lowers overall installation costs for analog signal loops.

The YOKOGAWA AAI143-S50 S1 supports hot-standby redundant configuration by installing two identical modules in adjacent slots. In case of primary module failure, the backup automatically takes over without process interruption – critical for emergency shutdown systems and continuous production lines.

The AAI143-S50 S1 YOKOGAWA 16-Channel Isolated Analog Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
YOKOGAWA AAI143-S50 S1 16-Channel Isolated Analog Input 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 AAI143-S50 S1 16-Channel Isolated Analog Input Module

General

  • Manufacturer YOKOGAWA
  • Model AAI143-S50 S1
  • Condition New Original ready stock
  • Product Family AAI143-S03 S1,AAI143-S53 S1,AAI143-H53 S1
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.
  • Oil & Gas Wellhead Monitoring – The YOKOGAWA AAI143-S50 S1 captures casing pressure and flow rate 4-20mA signals from remote well pads, with isolation protecting against lightning-induced surges.
  • Chemical Reactor Temperature Control – 16 isolated channels allow direct connection of thermocouple-to-current transmitters without ground loop errors, ensuring precise exothermic reaction management.
  • Power Generation Boiler Drum Level – Redundant configuration of the YOKOGAWA AAI143-S50 S1 ensures continuous level measurement even during module failure, preventing boiler trips.
  • Water & Wastewater Treatment – From chemical dosing pumps to sludge level transmitters, this module provides reliable analog input collection across distributed treatment basins.
  • Real-Time 4-20mA Acquisition – 10 ms update period per channel enables the YOKOGAWA AAI143-S50 S1 to feed high-speed control loops such as compressor surge protection or fast batch reactions.
  • Per-Channel 2-Wire/4-Wire Configuration – The module adapts to existing field wiring schemes without external signal conditioners, reducing engineering effort during plant retrofits.
  • Dual-Redundancy for Critical Loops – By pairing two YOKOGAWA AAI143-S50 S1 modules, control systems achieve automatic failover for safety instrumented functions (SIF) and uninterrupted production.
  • HART Variable Monitoring – With the -H variant, operators can read digital HART variables (PV, SV, TV, QV) from smart transmitters without additional hardware or wiring.
  • ISA Standard G3 Option (–3 Suffix) – The YOKOGAWA AAI143-S50 S1 with G3 option withstands corrosive atmospheres (e.g., H₂S, SO₂) commonly found in pulp mills, refineries, and wastewater plants.
  • 1500 V AC Isolation (Input to System) – Compliant with industrial control system isolation standards, protecting the backplane and controller from field-side faults.
  • Explosion Protection (E Suffix) – Available for hazardous area installations, though note: a Zener barrier is NOT compatible – use an isolation barrier for intrinsic safety with the YOKOGAWA AAI143-S50 S1.
  • Wide Temperature Operation (-20 to 70 °C) – With the temperature option, the YOKOGAWA AAI143-S50 S1 performs reliably in unheated outdoor enclosures or desert installations.
Description
The YOKOGAWA AAI143-S50 S1 delivers 16 isolated input channels for standard 4-20 mA signals from pressure, temperature, flow, and level transmitters. With its ±16 µA accuracy and 10 ms data update period, this YOKOGAWA AAI143-S50 S1 captures real-time process changes without signal interference between channels, making it ideal for applications requiring precise analog measurement.

What sets the YOKOGAWA AAI143-S50 S1 apart is its 1500 V AC isolation between input channels and the system, protecting your control infrastructure from ground loops and voltage spikes. The YOKOGAWA AAI143-S50 S1 supports dual-redundant configuration, allowing hot-swappable backup modules to maintain 100% uptime for critical control loops.

The YOKOGAWA AAI143-S50 S1 provides built-in transmitter power supply (19.0 V minimum at 20 mA) and per-channel configurability for 2-wire (loop-powered) or 4-wire (externally powered) transmitters. Additionally, the YOKOGAWA AAI143-S50 S1 supports HART communication (AAI143-H variant), enabling simultaneous analog reading and digital HART variable extraction for smart field devices.

Engineered for industrial resilience, the YOKOGAWA AAI143-S50 S1 operates reliably across wide temperature ranges and is available with ISA Standard G3 option (-20 to 70 °C) for corrosive atmospheres. Whether in oil refineries or chemical plants, the YOKOGAWA AAI143-S50 S1 delivers continuous, high-integrity analog input performance.
Alternative Names
AAI143S50S1 AAII43-S50 SI AAII43-S50 S1 AAI143-S50 SI AAI143-S5O S1 AAII43S50SI AAII43S50S1 AAI143S50SI
Technical notes
When using the YOKOGAWA AAI143-S50 S1, note that a Zener barrier is not permitted for intrinsically safe applications – use an isolation barrier instead. Also, if utilizing the dedicated KS1 cable, the withstand voltage between input signal and system is reduced to 500 V AC (down from 1500 V AC with pressure clamp terminals).
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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.
In which applications is the YOKOGAWA AAI143-S50 S1 most commonly used?
The YOKOGAWA AAI143-S50 S1 is widely deployed in oil & gas wellhead monitoring, chemical reactor temperature control, power plant boiler drum level measurement, and water treatment flow metering. Any process requiring 16 isolated 4-20mA inputs from pressure, temperature, or flow transmitters is a natural fit.
What happens if the field signal line on one of the channels of the YOKOGAWA AAI143-S50 S1 is short-circuited?
Thanks to per-channel isolation, a short on one input of the YOKOGAWA AAI143-S50 S1 will not damage the module or affect other channels. The affected channel may read incorrectly, but the remaining 15 channels continue normal operation, and the system remains safe.
Does the YOKOGAWA AAI143-S50 S1 support HART communication?
A dedicated HART variant exists: YOKOGAWA AAI143-H (same hardware, different suffix). When installed on an ER bus node unit with EB401 firmware rev. 2 or later, it supports HART Command #3 variable reading alongside the 4-20mA analog signal.
What happens when two YOKOGAWA AAI143-S50 S1 modules are configured as redundant?
When two YOKOGAWA AAI143-S50 S1 modules are configured redundantly, the standby module continuously tracks the active module. Upon failure detection, the backup takes over within milliseconds. The field transmitter sees no interruption because the input resistance on the standby module remains high (500 kΩ or more) until switchover.
How fast does the YOKOGAWA AAI143-S50 S1 update process values?
The module updates all 16 channels every 10 milliseconds. This 10 ms data update period makes the YOKOGAWA AAI143-S50 S1 suitable for fast process control loops such as compressor anti-surge control or rapid chemical dosing.