Michell Instruments Optidew User Manual page 47

Optidew Series User's Manual
NOTE: Negative values for temperature are displayed using the following
format:
• Characters 10 to 13 represent the %RH value multiplied by 10.
In this example
• Characters 14 to 17 represent the mirror signal level and can have a
value from 0 to 1023.
In this example the value is 124, or 0%.
NOTE: The mirror condition shown on the Optidew/Optidew Vision display
and OptiSoft is rounded to a whole number and is calculated as follows:
• Characters 18 to 21 represent the depression of the heat pump and
can have a value from 0 to 1023.
In this example the value is 0589, or 24% (cooling).
NOTE: The depression is shown on the Optidew/Optidew Vision display and
OptiSoft as a percentage, and is calculated as follows:
• Character 22 represents the status of the instrument.
In this example the value is 2, or Measuring.
0 = ABC, 1 = Data Hold, 2 = Measuring, 3 = Optics Alarm, 4 = Set-point Alarm.
• Characters 23 to 27 represent the gm
therefore
• Characters 28 to 32 represent the gkg
therefore
• Character 33 indicates if the dew point / temperature values are in
°C or °F: 0 = °C, 1 = °F
In this example it is 0, or °C.
• Character 34 indicates if the instrument is cooling, heating, or is controlling:
0= cooling, 1= control, 2= heating.
In this example it is 1, or control.
Michell Instruments
Temperature = (8000 – value) / 10
e.g. 7999 = -0.1°C/F or 7789 = -21.1°C/F
0975 is equal to 97.5%RH.
Mirror Condition % = (mirror signal level – 123) / 10
e.g. (124-123)=1/10=0.1=0%
If depression > 450
peltier drive % = (PeltierDrive - 450) / 5.73, peltier is cooling
If depression < 450
peltier drive % = (449 - PeltierDrive) / 4.49, peltier is heating
If depression = 0 peltier is neither heating nor cooling
11616 = 116.16
08972 = 89.72
value to two decimal places,
-3
value to two decimal places,
-1
APPENDIX B
39