The NI FP-RTD-124 is an eight-channel FieldPoint input module for four-wire RTD and resistance measurements in industrial and laboratory environments. It directly interfaces with platinum RTDs—including PT100 and PT1000 sensors—and performs direct resistance measurements up to 400 Ω. The four-wire sensing architecture eliminates lead resistance errors, while built-in linearization supports six TCR values spanning PT100 standards (IEC-751, DIN 43760, BS 1904, ASTM E1137) and ITS-90 reference functions for high-accuracy metrology.
Technical Specifications
• Input Channels: 8 channels, four-wire RTD and resistance input
• RTD Compatibility: PT100 and PT1000; 2-wire, 3-wire, and 4-wire configurations supported
• Resistance Measurement Range: 0–400 Ω direct measurement
• Temperature Range: –200 to 850 °C (73 to 1,123 K; –328 to 1,562 °F)
• ADC Resolution: 16-bit; 0.016 °C resolution
• Excitation Current: 2 mA per channel
• Update Rate: 1 update per second per channel
• Filtering: Built-in 50 Hz and 60 Hz noise rejection
• Transient Overvoltage Protection: 2,300 Vrms
• Power Consumption: ~350 mW
• Power Source: FieldPoint terminal base
– Key Features
• Four-wire sensing eliminates lead resistance error and enhances measurement accuracy
• Built-in linearization for platinum RTDs with selectable TCR values: 3.750, 3.851, 3.911, 3.916, 3.920, and 3.928 mΩ/Ω/°C
• Supports nominal resistances of 100 Ω and 1,000 Ω
• Simultaneous measurements across all eight channels
• 16-bit ADC provides 0.016 °C resolution
– Typical Applications
• Industrial temperature monitoring with PT100/PT1000 sensors
• Laboratory precision temperature measurement
• Resistance characterization and direct resistance input acquisition
– Compatibility & Integration
• Operates as a FieldPoint module within NI FieldPoint terminal bases
• Model Number: FP-RTD-124
• Part Number: 18720.8 / 777318-124
