ROTRONIC MBW 473 - Manual (Page 12)

8 MBW473_MANUAL_E_V2.0
Data Lines
The first three lines of the display show a numeric or graphic representation of the measured data. We
will refer to these first three lines as Data Lines.
If numeric, a data line contains the value
to the left, with the parameter description
and units to the right.
If graphic, a data line shows a simple
graph of data over time.
Data can be displayed in different parameters and units either numerically or graphically. Please refer
to section 4,
‘System Configuration’ to learn how to configure your preferences.
Status Line
Balance
Although it i s directly obtained from the intensity of the mirror’s reflected light signal, balance is effec-
tively the first derivative of the dew thickness measurement. It indicates the rate of growth or reduction
of the condensation layer on the mirror. While the dew or frost layer on the mirror surface is growing,
the indicator will be above center. The faster the layer is growing, the higher the indication. Converse-
ly, when the layer on the mirror surface is evaporating, the indicator will be below center. The faster it
disappears, the lower the indication. When the indicator is in the center, the thickness of the dew or
frost layer is neither growing nor evaporating, and the layer on the mirror surface is in equilibrium with
the gas. In this center position of the indicator, there is no net exchange of water vapor between the
gas and the mirror surface. If the humidity of the gas sample is homogeneous and of low enough vari-
ability for the control system to sense a steady value, the Balance indicator will show a green Stable
message, accompanied by a few short beeps.
Density
The Density Indicator graphically depicts the approximate thickness of the dew or frost layer on the
mirror surface. The 473 can automatically differentiate between dew and frost layers and the indicator
will display the current condensation state. The label in the density indicator will change from Layer
Density (when the state of the layer is uncertain) to either Dew Density or Frost Density (when ei-
ther dew or frost is being measured). For more information regarding Dew/Frost point determination
see
section ‘Dew / Frost Control’ on page 20.
Near the bottom of the display is the Sta-
tus Line. The Status Line displays Bal-
ance, Density, Contamination, and,
optionally, Battery Power.