BuildSysPro.IBPSA.Fluid.Sensors.PPM

# .BuildSysPro.IBPSA.Fluid.Sensors.PPM

Ideal one port trace substances sensor outputting in parts per million

## Information

This model outputs the trace substance concentration in ppm contained in the fluid connected to its port. The sensor is ideal, i.e., it does not influence the fluid.

The parameter `MM` is the molar mass of the trace substance. For a list of molar masses, see Modelica.Media.IdealGases.Common.SingleGasesData and Modelica.Media.IdealGases.Common.FluidData.

To measure PPM in a duct or pipe, use IBPSA.Fluid.Sensors.PPMTwoPort rather than this sensor. Read the IBPSA.Fluid.Sensors.UsersGuide prior to using this model to see about potential numerical problems if this sensor is used incorrectly in a system model.

#### Assumptions

This sensor assumes that the concentration C of the medium is in mass fraction. Otherwise, the conversion to ppm will be wrong.

## Revisions

- September 21, 2020, by Michael Wetter:
  Introduced parameter `warnAboutOnePortConnection` and updated documentation.
  This is for #1399.
- February 25, 2020, by Michael Wetter:
  Changed icon to display its operating state.
  This is for #1294.
- December 16, 2015, by Michael Wetter:
  Revised implementation, corrected error in the molar fraction which used the inverse ratio.
- December 2, 2015, by Filip Jorissen:
  First implementation.

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