Annex60.Fluid.Sensors.RelativeHumidityTwoPort

# .Annex60.Fluid.Sensors.RelativeHumidityTwoPort

Ideal two port relative humidity sensor

## Information

This model outputs the relative humidity of the fluid flowing from `port_a` to `port_b`. The sensor is ideal, i.e., it does not influence the fluid.

Note that this sensor can only be used with media that contain the variable `phi`, which is typically the case for moist air models.

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 Annex60.Fluid.Sensors.UsersGuide for an explanation.

## Revisions

- January 26, 2016 by Michael Wetter:
  Added `quantity` attribute for mass fraction variables.
  Made unit assignment of output signal final.
- January 18, 2016 by Filip Jorissen:
  Using parameter `tauInv` since this now exists in Annex60.Fluid.Sensors.BaseClasses.PartialDynamicFlowSensor. This is for #372.
- June 3, 2011 by Michael Wetter:
  Revised implementation to add dynamics in such a way that the time constant increases as the mass flow rate tends to zero. This significantly improves the numerics.
- Feb. 5, 2011 by Michael Wetter:
  First implementation.

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