Super Systems Simple Dew - Manual (Page 10)

Simple Dew Digital Dew Point Analyzer Operations Manual
Super Systems Inc. Page 10 of 18
8.1 Remove the cap of the 11.3% salt solution and install the sensor gland (with the
sensor) into the salt solution. To increase the life of the calibration salts, an effort
should be made to minimize the amount of time that the salt solution is exposed to
the ambient air.
9.0 Allow the sensor to reach equilibrium with the calibration salt.
9.1 Leave the sensor in the calibration salt for a minimum of 24 hours. It is acceptable
to leave the sensor in the salt solution for a longer period of time, even a few days, if
desired.
10.0 Begin the 11.3% (Zero) calibration process
10.1 After leaving the sensor in the salt for at least twenty-four (24) hours, turn the
unit on (if it isn’t on already).
10.2 Simultaneously press the “11.3%” and “Calibration” buttons on the
microprocessor board.
11.0 Verify the 11.3% (Zero) calibration
11.1 Leave the sensor in the 11.3%RH calibration salt
11.2 Record the temperature and the dew point of the sensor. Since there is no
display on the instrument, you will need to measure the voltage from the
microprocessor board and translate that into the appropriate measurement.
11.2.1 To determine the sensor temperature, measure the voltage between pins
5(+) and 9(-) on the microprocessor board. The voltage will be between 0
and 1VDC. Use the chart in Appendix A to determine the temperature in
°F, or use Appendix B to determine the temperature in °C.
11.2.2 Temporarily record the sensor temperature.
11.3 Look up this temperature in Appendix “C” (Determining the Dew Point in °F) or
Appendix “D” (Determining the Dew Point in °C). Appendix C will show the
temperature values in Fahrenheit, and Appendix D will show the temperature values
in Celsius.
11.4 Next to the appropriate temperature, note the number in the corresponding
column titled “11.3%”. This will match the measured dew point, which can be
verified wherever the dew point is displayed.
12.0 After the 11.3% (Zero) calibration has been completed, remove the sensor from the
calibration salt and replace the cap on the salt.