Overview

The IC670ALG620 is an analog input module designed to support 4 independent 3-wire or 4-wire RTDs, including platinum, nickel, nickel/iron, or copper types. 

Specifications

• Channels: 4 independent RTDs (3-wire or 4-wire)
• Resistance Range: 0 to 500 ohms, 0 to 3000 ohms
• RTD Types: Platinum (10, 25, 100, 1000 ohms), Copper (10, 100 ohms), Nickel (100, 50, 120 ohms), Nickel/Iron (604, 1000 ohms)
• Measurement Units: Resistance, Temperature (°C or °F)
• Accuracy: ±0.15% of reading, ±0.3 to 0.5°C at 25°C
• Temperature Sensitivity: ±0.004% of reading, ±1.5 µV per °C (0 to 60°C)
• Maximum Lead Resistance: 5 ohms per lead
• Scan Time:
  • 60 Hz: 210 ms per point
  • 50 Hz: 230 ms per point
• Digital Resolution: 15 bits plus sign
• Power Supply: No loop power required; excitation current supplied by the module
• Current Drawn from BIU: 190 mA maximum
• Operating Temperature: 0 to 55°C
• Fault Detection: Open RTD, input short, underrange, overrange, high/low alarms
• Isolation:
  • User input to logic: 1500 VAC for 1 minute, 250 VAC continuous
  • Channel to channel: 250 VAC continuous
  • Common mode voltage: 250 Vrms (350 VDC peak AC)
  • Normal mode voltage: 28 VDC or peak AC maximum
• Mode Rejection:
  • Normal Mode: 60 dB at 50/60 Hz (100% span)
  • Common Mode: 120 dB at 50/60 Hz (100 ohm imbalance)

Indicators & Diagnostics

• LED Indicator:
  • ON: Normal operation
  • Flashing: Module fault
  • OFF: Loss of power or fatal fault