Vaisala DRYCAP DMT346 Guía de usuario Pagina 109

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Chapter 5 ___________________________________________________ Calibration and Adjustment
VAISALA_______________________________________________________________________ 107
CHAPTER 5
CALIBRATION AND ADJUSTMENT
This chapter provides you with instructions on how to calibrate and
adjust Vaisala DRYCAP
®
Dewpoint Transmitters DMT345 and
DMT346.
Calibration
DMT345 and DMT346 are fully calibrated and adjusted as shipped
from the factory. The typical calibration interval is one year.
Calibration must always be done when there is reason to believe that
the device is not within the accuracy specifications.
It is recommended that the device should be sent to a Vaisala Service
Center for calibration and adjustment, see contact information under
heading Vaisala Service Centers on page 125.
NOTE
If the process is not shut down for removing the transmitter for
calibration, the hole for the probe in the cooling set must be plugged;
otherwise, there is a risk of water condensing inside the cooling pipe
(in overpressurized processes).
User Calibration and Adjustment
When adjusting DMT345 or DMT346, the reading of the transmitter
is changed to correspond to the reference value. After the adjustment,
the original calibration certificate shipped with the product is no
longer valid.
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