DP2000 Portable Dew Point Analyzer Operations Manual
Super Systems Inc.
Page # 14 of 30
8.0
Determine the acceptability of the reading.
8.1
The value printed on the chart in Appendix A is a theoretical value,
and some variation can be expected. When a calibration is performed
at SSI, we certify (in writing) that the unit displays /- 1 degree
of the theoretical value after it has been calibrated. We would not
consider a calibration to be successful unless it is /- 1 degree,
however in the case of a field calibration, this degree of accuracy may
or may not be required. The degree of accuracy that is acceptable is
determined by the policy of the person performing the calibration.
NOTE: Keep in mind that the DP2000 only displays even numbers, and
not tenths of a degree. Therefore, a reading of 65°F could be as low as
64.50 or as high as 65.49.
9.0
Allow the sensor to achieve equilibrium at ambient atmosphere.
9.1
After the 75.3% (Span) calibration has been completed, remove the
sensor from the calibration salt and replace the cap on the salt.
9.2
Leave the sensor probe in the gland and while the unit is still on,
allow it to achieve equilibrium at the ambient atmosphere in the room.
This is accomplished by simply leaving the sensor exposed to ambient
air for between two and three minutes. You will know when this has
been accomplished when the numbers on the display begin to stabilize.
10.0
Install the sensor probe into the 11.3% salt solution.
10.1
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.
10.2
Turn the unit off.
11.0
Allow the sensor to reach equilibrium with the calibration salt.
11.1
With the power to the unit still turned off, 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.