Vaisala Drycap DMT142, Руководство пользователя

Страница: 39 / 50

Chapter 6 _______________________________________________________________ Maintenance
VAISALA________________________________________________________________________ 29
CHAPTER 6
MAINTENANCE
This chapter provides information that is needed in basic maintenance
of Dewpoint Transmitter DMT142, and contact information for
Vaisala Service Centers.
Calibration and Adjustment
The DMT142 is fully calibrated as shipped from factory. The
recommended calibration interval is 2 years. However, calibration
should be done if there is a reason to believe that device is not within
the accuracy specifications.
A simple field-checking operation can be performed by comparing the
readings of the DMT142 and the DM70 hand-held dewpoint meter
with a calibrated reference probe. For the comparison you need a
connection cable, Vaisala order code: 211917ZZ.
If there is need for calibration or adjustment contact Vaisala Service
Center or your local Vaisala representative.
Filter Change
The DRYCAP
®
sensor in the DMT142 transmitter is protected with a
stainless steel sintered filter. The filtering grade is 34
μ
m.
The filter is recommended to be changed whenever it looks dirty or as
a part of the periodical maintenance procedure. The recommended
replacement interval depends heavily on the application and can vary
from less than a year up to several years.