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DNR-AI-212
DNR-AI-212
12-Channel, fully isolated Thermocouple input board
 
The DNA-AI-212 and DNR-AI-212 are 12-channel fully isolated, simultaneously sampling thermocouple input boards compatible with UEI’s popular Cube and RACKtangle chassis respectively. The DNA/DNR versions are electronically identical. The DNx-AI-212 features a ±2.048 V input range and 24-bit converters. At the gain of 16 used for most TC types the AI-212 provides an input resolution of 7.6 nanovolt.

An A/D per channel configuration allows simultaneous sampling at rates up to 100 S/s each (1200 S/s aggregate). The A/D per channel configuration virtually eliminates input cross talk and channel settling time issues.

The DNx-AI-212 is an ideal, high accuracy thermocouple measurement device, offering offset and gain errors of less than 0.1°C on all standard thermocouples (including J, K, T, S, E, R). This accuracy combined with the 350 VDC/Vrms channel-to-channel and channel-to-chassis isolation makes the board a perfect solution for industrial temperature measurement, even when using non-isolated thermocouples in high voltage environments. If higher isolation is required, please refer to the DNx-AI-282.

Additionally, the DNx-AI-212 is designed to take advantage of the extremely accurate ADT 7420 digital temperature sensor which provides a dedicated CJC measurement. The CJC sensor is mounted externally on the DNA-STP-212 screw terminal panel. The software included will perform all required TC linearization and CJC compensation and return data in °C, °K, °F or °R when desired. An open thermocouple detection circuit has also been implemented.

Software included with the DNx-AI-212 provides a comprehensive yet easy to use API that supports all popular Windows programming languages as well as supporting programmers using Linux and most real-time operating systems including QNX, RTX, VXworks and more. Finally, the UEIDAQ Framework supplies complete support for those creating applications in data acquisition software packages such as LabVIEW, MATLAB/Simulink, DASYLab or any application which supports ActiveX or OPC servers.
 
Characteristics:
  • For use in “CUBE” chassis
  • 12 fully differential analog input channels
  • Channel-to-channel and channel-to-chassis isolation
  • Simultaneous sampling (one A/D converter per channel)
  • 24-bit resolution
  • Built-in anti-aliasing filters)
  • 24-bit resolution
  • Built-in 50, 60 and 400 Hz rejection
  • 100 Hz, per channel sample rates
  • Built-in CJC circuitry for Thermocouple monitoring
 
Technical Specifications
Parameter
Number of channels: 12 fully differential plus
ADC resolution 24 bits
Sampling rate up to 1800 samples/sec per channel
21,600 S/S board aggregate
Input bias current < 100 pA typical (open TC source off)
Input offset < 1 uV @ 25°C, (<3 µV -40°C to +85°C)
Gain error ±0.005 % (typical)
Input INL error 6 ppm typical, 15 ppm max
Input impedance >5000 MΩ
Input range ±2.048 Volt (gain = 1)
Gains 1, 2, 4, 8, 16, 32, 64 (adjusted to optimize range for TC type selected)
Anti-Aliasing filtering @47.6% of sample rate, ~100 dB/decade
50/60/400 Hz notch filtering >70 dB at sample rate = 20 Hz or less
Common mode rejection G=1: 90 dB, G=32: 125 dB (typical)
Chan to Chan crosstalk < 0.5 µVrms
CJC Sensor type ADT 7420, mounted on STP pane
Isolation 350 Vrms, chan-to-chan & chan-to-chassis
Overvoltage protection -40V to +40V (power on or off)
Power consumption 4 W max
Operating temp. (tested) -40°C to +85°C
Operating humidity 95%, non-condencing
Vibration IEC 60068-2-6 5 g, 10-500 Hz, sinusoidal
IEC 60068-2-64 5 g (rms), 10-500Hz, broadband random
Shock IEC 60068-2-27 50 g, 3 ms half sine, 18 shocks @ 6 orientations
30 g, 11 ms half sine, 18 shocks @ 6 orientations
MTBF 230,000 hours