Vaisala DPT146 Guide de l'utilisateur télécharger pdf (Page 58)

User's Guide _______________________________________________________________________

56 ___________________________________________________________________ M211372EN-D

5. Disable the Auto power off function of the MI70 indicator to

prevent the indicator from powering off in the middle of the check.

Check the setting in the Settings - User Interface menu, and

change if necessary.

6. The MI70 can display three parameters at one time. To compare

the readings of the DPT146 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

7. After the measurement has stabilized, check the difference between

the readings. It will give you an indication of the approximate drift

of the DPT146 and its need for calibration. The difference between

the readings should be no greater than the combined measurement

uncertainty of the DPT146 and the reference probe.

8. Write down the results and repeat the comparison for each

parameter you want to check.

9. If adjustment is required, contact a Vaisala Service Center or your

local Vaisala representative to have the DPT146 adjusted.

NOTE

Some notes on using the MI70 indicator with the DPT146:

- If you disconnect the DPT146 while the MI70 indicator is on,

the quantities measured will remain on the screen, but no

measurement will be shown.

- Temperature measured by the DPT146 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.

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Vaisala DPT146 Guide de l'utilisateur Page 58