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
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