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Dynamic: whenever the measured dew point drops below the value set as 'FAST SetP', the mirror
is driven down to below -35°C to ensure the formation of ice on the mirror surface. The
instrument then continues operation as normal.
Note that Data Hold is active whenever FAST is active.
Note: Maximum recommended sensor temperatures to enable FAST to reach its required
cooling set-point are:
1 Stage Sensor: 21 °C
2 Stage Sensor: 30 °C
For further information, see section 3.2.
4.4.4. STANDBY Mode
In STANDBY mode, drive to the Peltier heat pump is disabled.
The main use for this feature is during set up (when measurements are not required), i.e.
when flow rates are being adjusted and the analog outputs are being configured.
4.4.5. Parameter Conversions & Pressure Compensation
Many parameters which are calculated by the Optidew require a temperature or pressure
reading in addition to dew point to ensure the calculated value is correct.
These additional readings can either come from a sensor connected to the Optidew, or from
a fixed (manual) input. See section 3.2 for details on external inputs.
Calculated Parameter
%RH
wvp
g/m
3
g/kg
Wetbulb
ppm
V
ppm
W
%Vol
Michell Instruments
Temperature input
required
Optidew User's Manual
Pressure input required
41
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