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The VEX-112S-1 card is a 12 channel, programmable, bi-polar, constant voltage, intrinsically safe, excitation card. Programmable outputs include 0V, ±2.5V, ±5V, ±7.5V, ±10V and ±28V settable in groups of two with an output accuracy of ±0.15 percent maximum over the operating temperature range. Each output can provide up to 25 mA current and is short circuit protected.

The VEX-112S-1 can be used in all nDAU-20xx/WDAU-20XX/ CDAU-20XX/EDAU-20XX series of data acquisition units.

To provide intrinsic safety, the excitation is limited to 34 mA. There is also a secondary, constant current circuit that will limit the current to 38 mA if the primary current limit should fail. The voltage sense and transistor drive lines have a resistor in series to limit the maximum possible current output to 8 mA during a fault condition.

Key Features

  • For use in CDAU/EDAU data acquisition units
  • 12 channels of bi-polar excitation voltage
  • Programmable outputs including 0V, ±2.5V, ±5V, ±7.5V, ±10V, ±28V
  • Selectable in groups (2 positive channels and 2 negative channels)
  • Accuracy of ±0.15% per group
  • Up to ±25 mA per output
  • Each output is short circuit protected
  • Intrinsically safe


  • Transducer excitation
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