The NI cFP-TC-120 is an 8-channel thermocouple input module for National Instruments Compact FieldPoint systems. It delivers precise temperature measurement across eight differential inputs with integrated cold-junction compensation, linearization to NIST ITS-90 standard, and automatic scaling to engineering units. The module supports eight thermocouple types—B, E, R, K, J, N, T, and S—plus millivolt-level voltage inputs. Its 16-bit measurement resolution, open thermocouple detection with LED indicators, and onboard 50/60 Hz noise rejection enable accurate data acquisition in demanding industrial environments. Hot-swappable design permits installation and removal without system shutdown.
Technical Specifications
Measurement & Input
• 8 differential thermocouple or millivolt inputs
• Supported types: B, E, R, K, J, N, T, S
• 16-bit resolution
• Voltage ranges: ±25 mV, ±50 mV, ±100 mV, –20 to 80 mV
• Temperature ranges: –270 to 1,770 °C / 0 to 2,048 K / –454 to 3,218 °F
• Update rate: 1.13 s with filters enabled; 0.22 s filters off
• Input noise: ±1 LSB peak-to-peak
• Input current: 35 nA typical, 140 nA maximum
• Input bandwidth: 3 Hz
Protection & Isolation
• Overvoltage protection (I/O to bus): 2,300 Vrms
• Input overvoltage protection: ±40 V
• Bank isolation: 2,300 Vrms breakdown
• Operational isolation (double insulation): Up to 250 Vrms
• Common-mode isolation: 250 Vrms
Environmental
• Operating temperature: –40 to 70 °C
• Storage temperature: –55 to 85 °C
• Dimensions: 5.0 × 3.5 × 1.0 in
• Weight: 3.7 oz / 4.6 oz
– Key Features
• Cold-junction compensation via integrated thermistor
• NIST ITS-90 linearization
• Open thermocouple detection with indicator LEDs
• Self-diagnostics capability
• Automatic overranging
• Hot-pluggable (HotPnP) design
• 50/60 Hz noise rejection
– Typical Applications
• Industrial process control and monitoring
• Device and component testing
• Environmental temperature monitoring
• Precision thermal measurement in field deployments
– Compatibility & Integration
Compatible with cFP-CB-1 or cFP-CB-3 connector blocks. Use of an isothermal connector block (such as cFP-CB-3) is recommended for optimal cold-junction compensation and measurement accuracy.
