Vaisala DMT143 - Manual (Page 64)

USER'S GUIDE ____________________________________________________________________
62 ___________________________________________________________________ M211435EN-E
7. The MI70 can display three parameters at one time. To compare the
readings of the DMT143 and the reference probe, select the desired
parameter from the Display – Quantities and Units menu of the
MI70.
Select the same parameter from port I and II, and the delta
parameter that shows the difference between the two. For example,
∆T
d/f
shows the difference in dewpoint between the two probes.
1108-039
Figure 23 Comparing Dewpoint Readings on MI70
8. After the measurement has stabilized, check the difference between
the readings. It will give you an indication of the approximate drift
of the DMT143 and its need for calibration. The difference
between the readings should be no greater than the combined
measurement uncertainty of the DMT143 and the reference probe.
9. Write down the results and repeat the comparison for each
parameter you want to check.
10. If adjustment is required, contact a Vaisala Service Center or your
local Vaisala representative to have the DMT143 adjusted.
NOTE Some notes on using the MI70 indicator with the DMT143:
- If you disconnect the DMT143 while the MI70 indicator is on,
the parameters measured will remain on the screen, but no
measurement will be shown.
- Temperature measured by the DMT143 is shown as parameter
Ta (not T) in the MI70.
- The messages from the transmitter will appear in English even if
the MI70 has been set to another language.