Virtual Hygrometer Window; Mirror Condition; Figure 5 Virtual Hygrometer Window - Michell Instruments Optidew User Manual

OPERATION
3.4.1

Virtual Hygrometer Window

The Humidity Display has the ability to show dew point (°C/°F), %RH, gm
(t – tdp) or a
Selecting one of these options will show the measured or calculated value, but will not
change the Channel 1 mA output of the instrument, as this can only be done via the
Parameter Setup window, see Section 3.4.4.
When the software is executed, the displayed units will default to the present setting of
Channel 1 mA output. The ambient temperature is shown in the lower display.
NOTE: The humidity display will blink if the dew point is higher than the
temperature. This is normal and not a fault.
3.4.2

Mirror Condition

Mirror Condition indicates the amount of signal received back from the mirror, which
includes both the level of moisture and contamination on the mirror surface. In DCC
mode this display will only show the amount of mirror contamination and, if greater
than 80% after a DCC, the optics fault alarm will be activated. This normally means the
mirror needs cleaning, followed by resetting the mirror condition during a DCC cycle. A
low mirror signal level is indicated by a fl ashing 0%, indicating it should be reset during
a DCC cycle.
Refer to Section 5 for more details.
18
Figure 5
by clicking on the
Change Units
W
Optidew Series User's Manual
Virtual Hygrometer Window
button.
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