Description
NI 9214
Technical Specifications: Channel count: 16 thermocouple channels or 8 RTD channels ADC resolution: 24 bit Supported thermocouple types: J, K, T, E, N, S, R, B Supported RTD types: Pt100, Pt1000 and other resistance temperature detectors Cold junction compensation: Built-in high precision CJC sensor Sampling rate: Configurable per-channel sampling rate Operating temperature range: -40℃ ~ +70℃ Storage temperature range: -40℃ ~ +85℃ Relative humidity: 5% to 95%, non-condensing Connector type: Spring terminal block Form factor: C Series compact module Protection grade: IP20 when installed inside chassis
Functional Features: High precision temperature measurement from thermocouple and RTD field sensors. Integrated cold junction compensation for thermocouple measurement. Digital filtering to suppress power line frequency noise and high frequency interference. 24-bit high resolution analog to digital conversion for high accuracy temperature reading. Channel open circuit detection to identify broken sensor wiring automatically. Transmit temperature measurement data to host controller through C Series backplane bus. Compatible with LabVIEW software for temperature logging, alarm and data analysis. Built-in self-diagnosis function for sensor fault and module hardware abnormality.
Application Scenarios: Thermal cycling test bench, furnace temperature mapping, food processing temperature monitoring, battery thermal test, semiconductor thermal characterization, building HVAC thermal measurement, environmental chamber temperature monitoring, automotive engine component thermal testing.
Performance Parameters: High temperature measurement accuracy across full sensor working range. Open circuit fault detection response for broken thermocouple wires. Digital filter suppresses 50Hz and 60Hz power frequency interference. Continuous operation: 24 hours stable temperature data acquisition inside test cabinet. High resolution sampling for slow changing temperature signals.
Material Composition: PCB substrate: Multi-layer FR4 glass fiber epoxy printed circuit board. Core components: 24-bit ADC chip, precision reference resistor, cold junction temperature sensor, signal conditioning IC. Housing: Black flame retardant PA plastic enclosure. Connector: Spring push-in terminal block with gold plated copper contacts. Internal shielding: Metal shielding for weak analog signal circuit.
Structural Features: Compact C Series module form factor for cDAQ and cRIO chassis installation. Front panel with spring terminal block and printed channel wiring diagram. Internal circuit layout separated into analog sensor conditioning region, ADC conversion region and digital communication region. Back side C Series edge connector for power supply and backplane data communication. Isolation circuit to protect digital bus from analog signal surge.
Working Principle: Module receives power supply from cDAQ or cRIO chassis backplane after installation. Weak millivolt signal from thermocouple or resistance signal from RTD enters front terminal block. Signal conditioning circuit amplifies and filters raw sensor signal. Built-in cold junction sensor measures reference junction temperature for thermocouple measurement. 24-bit ADC converts conditioned analog signal to digital data. On-board processor calculates real temperature value from calibrated sensor characteristic curve, then transmits temperature data and channel status to host controller through backplane bus. Open circuit detection circuit monitors sensor wiring integrity continuously.
Installation Requirements: Power off chassis before inserting or removing NI 9214 module. Insert module into empty C Series chassis slot and lock retaining latch. Connect thermocouple or RTD sensor wires to spring terminals following wiring diagram. Configure sensor type, filter parameter and sampling rate in NI measurement software. Ensure reliable protective earth ground connection for chassis. Separate temperature sensor cables from high voltage power cables. Reserve air circulation space around chassis for heat dissipation.
Usage Notes: Do not hot swap module while chassis power is active. Use dedicated thermocouple extension wire for thermocouple signal wiring. Backup measurement configuration before modifying sensor channel parameters. Wear anti-static wristband when handling module. Check terminal block tightness regularly during maintenance. Do not operate module beyond rated temperature and humidity range. Prevent moisture and conductive dust from entering terminal area.
