BuildingSystems.Fluid.Sensors.PPMTwoPort

# .BuildingSystems.Fluid.Sensors.PPMTwoPort

Ideal two port trace substances sensor outputting in parts per million

## Information

This model outputs the trace substance of the passing fluid in parts per million. The sensor is ideal, i.e., it does not influence the fluid. If the parameter `tau` is non-zero, then its output is computed using a first order differential equation. Setting `tau=0` is not recommend. See BuildingSystems.Fluid.Sensors.UsersGuide for an explanation.

## Revisions

- February 25, 2020, by Michael Wetter:
  Changed icon to display its operating state.
  This is for #1294.
- January 12, 2016, by Filip Jorissen:
  First implementation. See issue #372

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