The Yokogawa ASI133 Current Input Module is designed for accurate and reliable acquisition of analog current input signals in industrial automation and control systems. It supports both 2-wire and 4-wire transmitter configurations and features isolation to ensure safe operation. The module is ideal for systems requiring precise current measurement, with a high withstand voltage rating and minimal drift due to temperature changes.

Technical Specifications

• Model: ASI133
• Number of Input Channels: 8, isolated
• Input Signal: 4 to 20 mA
• Allowable Input Current: 22.5 mA
• Withstanding Voltage: 1500 V AC
• Input Resistance:
  • Power ON:
    • 2-wire: 400 Ω (I=20 mA) to 750 Ω (I=4 mA)
    • 4-wire: 485 Ω (I=20 mA) to 925 Ω (I=4 mA)
  • Power OFF: ≥ 1 MΩ
• Accuracy: ±16 µA
• Step Response Time: 100 ms
• Data Update Period: 10 ms
• Transmitter Power Supply: 16 V DC or higher (output current limit: 20 mA)
• Maximum Normal Mode Input Voltage: 25 V (for 4-wire transmitter)
• Drift Due to Ambient Temperature Change: ±16 µA/10 °C
• Maximum Current Consumption:
  • 150 mA (5 V DC)
  • 450 mA (24 V DC)
• Weight: Approx. 0.30 kg
• External Connection: Pressure clamp terminal (ATSA3□)
• HART Communication: Available
• Barrier Type: Isolated interface