Vaisala DM500 - Manual (Page 83)

Chapter 15 _________________________________________________Calibrationd and Adjustment
VAISALA _______________________________________________________________________ 81
CHAPTER 15
CALIBRATIOND AND ADJUSTMENT
This chapter provides you with information about the calibration and
adjustment of the DM500.
General About Calibration and Adjustments
Calibration Interval
The DMP501 dewpoint sensing unit is fully calibrated as shipped
from factory. The recommended calibration interval is one year.
However, calibration shall be done if there is a reason to believe that
device is not within the accuracy specifications.
In adjustment, the reading of DM500 is changed to correspond to the
reference value. After adjustment, the original calibration certificate
shipped with the product is not valid anymore.
Calibration Laboratory
The dewpoint calibration shall be carried out at Vaisala or in other
calibration laboratory capable to perform high accuracy dewpoint
calibrations traceable to national/international standards.