Calibration and adjustment, Chapter 6, Chapter 6, calibration and adjustment – Vaisala MMT310 User Manual
Page 55: On calibration and adjustment
Chapter 6 ____________________________________________________ Calibration and adjustment
VAISALA ________________________________________________________________________ 55
CHAPTER 6
CALIBRATION AND ADJUSTMENT
This chapter describes the calibration and adjustment procedures. Note
that after adjustment, the original calibration certificate shipped with the
product is not valid anymore.
The MMT318 and MMT317 are calibrated as shipped from the factory.
Typical calibration interval is one year. Depending on the application it
may be good to make the first calibration check earlier.
NOTE
When measuring moisture in transformer oil, the recommended
calibration interval is 3 years.
Relative humidity calibration must be done always after sensor change.
Calibration of the MMT318 and MMT317 can be carried out by the user
according to the instructions given in this chapter.
Vaisala recommends using the calibration services offered by Vaisala.
Vaisala Service Centers perform calibrations and adjustments as well as
repair and spare part services, and offer accredited calibrations and
maintenance contracts.
For Vaisala Service Center contact information, see
Calibration services can also be ordered online at
CAUTION
If you think the MMT310 is not measuring correctly, calibration and
adjustment is not the first thing to do. Try the following first:
- Make sure heat sources or temperature differences are not interfering
with the measurement.
- Always wait for the measurement to stabilize.
NOTE
For an introduction to calibration, order or download the free calibration
book from Vaisala at the following address: