The NI 9213 is a 16-channel thermocouple input module for high-density temperature measurement in CompactDAQ and CompactRIO systems. Built around a 24-bit Delta-Sigma ADC, it delivers precision thermal data across demanding test, industrial, and logging applications. The module supports eight standard thermocouple types—J, K, T, E, N, B, R, and S—with built-in cold-junction compensation and open thermocouple detection for measurement integrity in variable environments.
Technical Specifications
Architecture & Sampling
• 16 differential thermocouple input channels plus internal autozero and CJC channels
• Scanned sampling mode with configurable timing strategies
• Maximum shared sample rate: 75 S/s across all channels; up to 100 S/s possible with fewer active channels
• Voltage measurement range: ±78.125 mV
High-Resolution Mode (Optimized for Accuracy)
• Per-channel conversion time: 55 ms
• All-channel sample rate: 1 S/s
• Input bandwidth: 200 nV RMS
• CMRR (Channel-to-COM, DC and 50–60 Hz): 100 dB
• CMRR (COM-to-earth ground): >170 dB
• Gain error: 0.03% typical at 25 °C; 0.07% typical, 0.15% maximum at −40 to 70 °C
High-Speed Mode (Optimized for Throughput)
• Per-channel conversion time: 740 μs
• All-channel sample rate: 75 S/s
• Input bandwidth: 7 μV RMS
• CMRR (Channel-to-COM, 0–60 Hz): 70 dB
• CMRR (COM-to-earth ground): >150 dB
• Gain error: 0.04% typical at 25 °C
Accuracy Performance
• Measurement sensitivity: up to 0.02 °C
• Example measurement accuracy: 0.77 °C
• Maximum accuracy: 2.25 °C
– Key Features
• Built-in cold-junction compensation for temperature offset correction
• Autozero channel for drift mitigation
• Anti-aliasing filters for signal integrity
• Open thermocouple detection for circuit diagnostics
• Temperature ranges follow NIST standards for each supported thermocouple type
– Typical Applications
• Laboratory thermal testing and validation
• Industrial process monitoring
• Long-duration temperature data logging
• Multi-point thermal profiling in controlled and field environments
– Compatibility & Integration
The NI 9213 integrates directly into CompactDAQ and CompactRIO chassis, inheriting their modularity and real-time capabilities.
